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Dissertations / Theses on the topic 'LEC – light emitting electrochemical cells'

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Published: 4 June 2021
Last updated: 1 February 2022

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1

Moberg, Thomas. "Creating nanopatterned polymer films for use in light-emitting electrochemical cells." Thesis, Umeå universitet, Institutionen för fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-149396.

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Thermal nanoimprint lithography (T-NIL) is a cheap and fast technique to produce nanopatterns in polymeric materials. It creates these patterns by pressing a stamp down into a polymer film that has been heated above its glass transition temperature. These nanopatterned polymer films can be used in a wide variety of scientific fields, not the least the organic semiconductor industry. There the nanopatterned films have, among else, been used to improve the efficiency of organic light-emitting diodes (OLEDs). The light-emitting electrochemical cell (LEC), which is similar in structure to an OLED,
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2

Nahid, Masrur Morshed. "In Quest of Printed Electrodes for Light-emitting Electrochemical Cells: A Comparative Study between Two Silver Inks." Thesis, Umeå universitet, Institutionen för fysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-62827.

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This thesis presents a comparative study between two silver nanoparticle inks that were deposited using a Drop-on-Demand (DoD) inkjet printer, aiming at finding a functional ink that can be used to print electrodes in Light-emitting Electrochemical Cells (LECs). To achieve this, a DoD inkjet printer was installed and an acquaintance with the printer was attained. Among the two inks, one was employed as received while the other was reformulated, and successful deposition of both the inks was observed. During the reformulation process, it was seen that the highly volatile tetrahydrofuran (THF) s
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3

Vedin, Joel. "Utilizing an efficient color-conversion layer for realization of a white light-emitting electrochemical cell." Thesis, Umeå universitet, Institutionen för fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-122097.

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Organic semiconducting materials have received a lot of attention in recent years and can now be found in many applications. One of the applications, the light emitting electrochemical cell (LEC) has emerged due to its flat and lightweight device structure, low operating voltage, and possibility to be fully solution processed. Today LECs can emit light of various colors, but to be applicable in the lighting industry, white light need to be produced in an efficient way. White light on the other hand, is one of the toughest "colors" to achieve in an efficient way, and is of particular interest i
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4

Cai, Muzhi. "Hybrid materials based on inorganic glasses doped with organophosphorus molecules for light emitting electrochemical cell applications." Thesis, Rennes, INSA, 2019. http://partages.insa-rennes.fr/share/page/document-details?nodeRef=workspace://SpacesStore/cc6fb318-d6f8-4126-8db4-a2a825a605a7.

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La cellule électrochimique électroluminescente (LEC) est un dispositif à couches minces, composé d’un semi-conducteur organique électroluminescent (OSC) et d’ions mobiles en tant que matériau actif intercalé entre une anode et une cathode. Dans le premier chapitre, le contexte et le mécanisme de la LEC ont été introduits. Dans le deuxième chapitre, nous avons dopé la molécule organophosphorée dans un verre de silicate contenant une teneur élevée en lithium par la méthode sol-gel. Dans le troisième chapitre, nous avons travaillé à l’obtention d’un verre de phosphate dopé à une molécule organoph
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Umuhire, Mahoro Gilbert. "Development of new cationic copper (l) complexes for white light-emitting electrochemical cells." Thesis, Normandie, 2021. http://www.theses.fr/2021NORMC202.

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De nouveaux complexes de cuivre(I) cationiques de formule générale [Cu(P^P)(N^N)][PF6] où P^P représente un ligand bis-phosphine chélatant, bis-[2- (diphenylphosphino)phenyl]ether (DPEPhos) et N^N, des ligands 2,2-bis-pyridyls ont été développés. Les complexes ont montré des émissions à l’état solide couvrant tout le spectre du visible et la présence de la fluorescence retardée activée thermiquement (TADF) a été démontrée. Ces complexes ont été évaluées dans des cellules électrochimiques luminescentes (LECs) et ont conduit aux LECs émettant dans de différentes couleurs, i.e., bleue, verte, jau
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Namanga, Jude Eko [Verfasser], Anja-Verena [Gutachter] Mudring, and Anjana [Gutachter] Devi. "Structural modification of light-emitting iridium-based ionic transition metal complexes and their uses in light-emitting electrochemical cells (LECs) / Jude Eko Namanga ; Gutachter: Anja-Verena Mudring, Anjana Devi." Bochum : Ruhr-Universität Bochum, 2016. http://d-nb.info/1123283206/34.

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7

Dias, Rodrigo Coura. "Fabricação e caracterização de células eletroquímicas emissoras de luz (LECs)." Universidade Federal de Juiz de Fora (UFJF), 2017. https://repositorio.ufjf.br/jspui/handle/ufjf/6056.

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Submitted by Geandra Rodrigues (geandrar@gmail.com) on 2018-01-09T14:16:49Z No. of bitstreams: 1 rodrigocouradias.pdf: 2508131 bytes, checksum: a85f5360d98ae17dab9812e3e61a46cd (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2018-01-23T11:19:39Z (GMT) No. of bitstreams: 1 rodrigocouradias.pdf: 2508131 bytes, checksum: a85f5360d98ae17dab9812e3e61a46cd (MD5)<br>Made available in DSpace on 2018-01-23T11:19:39Z (GMT). No. of bitstreams: 1 rodrigocouradias.pdf: 2508131 bytes, checksum: a85f5360d98ae17dab9812e3e61a46cd (MD5) Previous issue date: 2017-
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8

Asadpoordarvish, Amir. "Functional and Flexible Light-Emitting Electrochemical Cells." Doctoral thesis, Umeå universitet, Institutionen för fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-102400.

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The introduction of artificial illumination has brought extensive benefits to mankind, and during the last years we have seen a tremendous progress in this field with the introduction of the energy-efficient light-emitting diode (LED) and the high-contrast organic LED display. These high-end technologies are, however, produced using costly and complex processes, and it is anticipated that the next big thing in the field will be the advent of a low-cost and “green” illumination technology, which can be fabricated in a cost- and material-efficient manner using non-toxic and abundant raw material
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9

Davis, Yevtte A. "Transient behavior of light-emitting electrochemical cells." Thesis, Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/5648.

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Approved for public release; distribution is unlimited.<br>Recent prototypes of the individual identification friend or foe (IIFF) patch use a light-emitting electrochemical cell (LEC) as the emitter. This research characterizes the transient behavior of LECs by measuring transient capacitance. The transient capacitance data are important to improve understanding of the underlying physics describing the operation of the LEC. The research goal was to make the first transient measurements of an LEC's capacitance as a function of temperature and bias, while simultaneously measuring the transient
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10

Sandström, Andreas. "Design and Fabrication of Light-Emitting Electrochemical Cells." Doctoral thesis, Umeå universitet, Institutionen för fysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-79544.

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Glödlampan, en gång symbolen för mänsklig uppfinningsförmåga, är idag på väg att försvinna. Lysdioder och lågenergilampor har istället tagit över då dessa har betydligt längre livstid och högre effektivitet. Den tidigare så hyllade glödlampan anses numera vara en miljöbov, och förbud och restriktioner mot den blir allt vanligare. Trots detta så är de nya alternativen bara att betrakta som provisoriska steg på vägen mot en ideal ljuskälla, som idag tyvärr inte existerar. Lågenergilampor innehåller exempelvis kvicksilver, och utgör därmed ett direkt hot mot en användares hälsa. Både lysdioder oc
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11

Lorenz, Janine. "Wet imprinting of polymer light-emitting electrochemical cells." Thesis, Umeå universitet, Institutionen för fysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-181933.

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Organic light-emitting electrochemical cells (LECs) are likely to become the low-cost andeco-friendly alternatives to organic light emitting diodes (OLEDs) if it is possible to enhancetheir efficiency. In OLED devices losses due to poor light-outcoupling could be reduced bytransferring nanopatterns to the different layers of the device. Applying the experience madewith OLEDs to the similar structured LECs, Nikolai Kaihovirta and co-workers were able toimprove the light-outcoupling efficiency of LECs by adding patterned surface structures tothe devices [3]. Since patterning the surface of an LE
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12

Matyba, Piotr. "Polymer light-emitting electrochemical cells : Utilizing doping for generation of light." Doctoral thesis, Umeå universitet, Institutionen för fysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-38953.

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The current implementation of conjugated polymers (“conducting plastics”) in a wide range of devices promises to bring the vision of a new generation of flexible, efficient and low-cost applications to reality. Plastic lightemitting devices in the form of polymer light-emitting diodes (PLEDs) are projected to be particularly close to the market in applications such as large area and conformable illumination panels and high-performance thin displays. However, two notable drawbacks of PLEDs are that they depend on vacuum deposition of a reactive metal for the negative electrode and that the acti
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13

Enevold, Jenny. "Development of light-emitting electrochemical cells for novel applications." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-59072.

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The work intended to make progress towards the objective of fiber-shaped light-emitting electrochemical cells (LECs). LECs comprising a film of poly(3,4-ethylenedioxythiophene): poly (styrenesulphonate) (PEDOT:PSS) cast from aqueous dispersion as the sole transparent anode were produced and characterized. It was shown that it is possible to achieve uniform yellow-green light emission at an efficiency of 0.96 cd/A from such LECs fabricated by spin coating at low rotational speed. Implications of using different cathode metals and varying the order of deposition of the films were studied and sho
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14

Monti, Filippo <1985&gt. "Luminescent Ionic Transition-Metal Complexes for Light-Emitting Electrochemical Cells." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5339/.

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The European Union set the ambitious target of reducing energy consumption by 20% within 2020. This goal demands a tremendous change in how we generate and consume energy and urgently calls for an aggressive policy on energy efficiency. Since 19% of the European electrical energy is used for lighting, considerable savings can be achieved with the development of novel and more efficient lighting systems. In this thesis, accomplished in the frame of the EU project CELLO, I report some selected goals we achieved attempting to develop highly efficient, flat, low cost and flexible light sources
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15

Lindh, E. Mattias. "Bilayer Light-Emitting Electrochemical Cells for Signage and Lighting Applications." Licentiate thesis, Umeå universitet, Institutionen för fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-114500.

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Artificial light surrounds us in a manifold of shapes. It is mainly utilized for illumination, but also for graphical communication of complex and evolving messages and information, among other things. It can be generated in different ways with incandescent lamps and fluorescent tubes constituting two common examples. Organic solid state light-generation technologies, which boast advantages such as solution processability, thin and flexible form factors, and large versatility, are modern additions to the field. But regardless of the means of generation, whenever light is to be used to communic
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16

Lindh, Mattias. "Inkjet deposition of electrolyte : Towards Fully Printed Light-emitting Electrochemical Cells." Thesis, Umeå universitet, Institutionen för fysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-80272.

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Organic electronics is a hot and modern topic which holds great promise for present and future applications. One such application is the light-emitting electrochemical cell (LEC). It can be fully solution processed and driven at low voltage providing light emission from a large surface. Inkjet printers available today can print a variety of inks, both solutions and dispersions. The technique is scalable and a quick and easy way to accurately deposit small quantities of material in user definable patterns onto a substrate. This is desirable to make low cost and efficient optical devices like di
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17

Santos, Gerson dos. "Estudo de dispositivos orgânicos emissores de luz empregando complexos de terras raras e de metais de transição." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/3/3140/tde-16042009-144608/.

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Neste trabalho foram projetados, fabricados e caracterizados funcionalmente dispositivos eletroluminescentes empregando complexos de Terras Raras (TR) e de Metais de Transição (MT) tanto como em filmes finos termicamente evaporados quanto formados através da técnica de spin-coating. O estudo foi iniciado com os complexos de TRs (especificamente o complexo de Európio e de Térbio) com filmes termicamente evaporados, com vistas à análise da eficiência externa dos dispositivos em função do ligante principal (CL). Desta análise observou-se que a particular estrutura química do CL resulta em diferen
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18

Wong, Michael Yin. "Creating novel thermally activated delayed fluorescence (TADF) emitters for light-emitting electrochemical cells (LEECs) and organic light-emitting diodes (OLEDs) applications and their structure-property relationship." Thesis, University of St Andrews, 2017. http://hdl.handle.net/10023/12975.

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Developing organic light-emitting diodes (OLEDs) as the next generation display devices is not only of industrial interest, but also a scientific challenge in and of itself that requires multi-disciplinary efforts to make the technology successful. Thermally activated delayed fluorescence (TADF) is a recent breakthrough in OLED technology whose prime value is to enable purely organic emitters to recruit the dark triplet excitons in the device, thus avoiding expensive and toxic rare metal based emitters. This thesis is centred on TADF and contains work in three major areas. Firstly, novel ionic
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19

Gaynor, Whitney 1982. "Methods of improving the performance of light-emitting electrochemical cells based on the Ru(bpy)₃ complex." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/32731.

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20

Elie, Margaux. "Développement de nouveaux complexes organométalliques de métaux de transition polyvalents pour la scintillation et la chimie médicinale." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMC227.

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Deux nouvelles familles de complexes de cuivre(I) cationiques, de formules [Cu(NHC)(N^N)][X] et [Cu(P^P)(N^N)][PF6], ont été synthétisées avec des ligands 2,2’ bis pyridyl pontés, chélates à six chaînons, facilement modulables. Ces complexes présentent des émissions à l’état solide centrées entre 455 et 520 nm (bleu à vert), avec de larges décalages de Stokes et des rendements quantiques pouvant atteindre 0,86. De plus, l’émission via un phénomène de fluorescence retardée activée thermiquement (TADF) a été prouvée pour les complexes [Cu(NHC)(N^N)][X]. Les premiers scintillateurs plastiques dop
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21

Meier, Sebastian B. [Verfasser]. "Organic Light-Emitting Electrochemical Cells for Lighting Applications : Organische licht-emittierende elektrochemische Zellen für Beleuchtungsanwendungen / Sebastian B. Meier." Aachen : Shaker, 2015. http://d-nb.info/1071529714/34.

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22

Di, Marcantonio Miriam [Verfasser], and Gerd [Akademischer Betreuer] Bacher. "Modification of charge balance in light emitting electrochemical cells for efficient solution-based devices / Miriam Di Marcantonio ; Betreuer: Gerd Bacher." Duisburg, 2020. http://d-nb.info/1221061844/34.

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23

Nadarajah, Athavan. "Fundamental Properties of Functional Zinc Oxide Nanowires Obtained by Electrochemical Method and Their Device Applications." PDXScholar, 2012. https://pdxscholar.library.pdx.edu/open_access_etds/633.

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We report on the fundamental properties and device applications of semiconductor nanoparticles. ZnO nanowires and CdSe quantum dots were used, prepared, characterized, and assembled into novel light-emitting diodes and solar cells. ZnO nanowire films were grown electrochemically using aqueous soluble chloride-based electrolytes as precursors at temperatures below 90° C. Dopants were added to the electrolyte in the form of chloride compounds, which are AlCl3, CoCl2, CuCl2, and MnCl2. The optical, magnetic, and structural properties of undoped and transition-metal-ion doped ZnO nanowires were ex
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24

Simon, Daniel. "Multistability, Ionic Doping, and Charge Dynamics in Electrosynthesized Polypyrrole, Polymer-Nanoparticle Blend Nonvolatile Memory, and Fixed p-i-n Junction Polymer Light-Emitting Electrochemical Cells." Doctoral thesis, University of California, Santa Cruz, USA, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-94587.

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A variety of factors make semiconducting polymers a fascinating alternative for both device development and new areas of fundamental research. Among these are solution processability, low cost, flexibility, and the strong dependence of conduction on the presence of charge compensating ions. With the lack of a complete fundamental understanding of the materials, and the growing demand for novel solutions to semiconductor device design, research in the field can take many, often multifaceted, routes. Due to ion-mediated conduction and versatility of fabrication, conducting polymers can provide a
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Simon, Daniel Theodore. "Multistability, ionic doping, and charge dynamics in electrosynthesized polypyrrole, polymer-nanoparticle blend nonvolatile memory, and fixed P-I-N junction polymer light-emitting electrochemical cells /." Diss., Digital Dissertations Database. Restricted to UC campuses, 2007. http://uclibs.org/PID/11984.

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26

Torres, Bruno Bassi Millan. "Caracterização de células eletroquímicas emissoras de luz: propriedades elétricas, estrutura e morfologia." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/18/18158/tde-27042018-092727/.

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As células eletroquímicas emissoras de luz são dispositivos eletroluminescentes cuja camada ativa é uma mistura de um material eletroluminescente e um eletrólito sólido a base de sais de metais alcalinos, geralmente lítio. A presença dos íons na camada ativa modificam o mecanismo de funcionamento das células quando comparadas ao diodos emissores de luz. Nas células, a concentração de íons nas interfaces eletródicas forma uma dupla camada elétrica que auxilia a injeção de cargas na camada ativa, por sua vez e na presença dos íons, o material eletroluminescente sofre dopagem se tornando condutor
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27

HU, Yufeng. "ELECTRICAL AND OPTICAL PROBING OF EXTREMELY LARGE PLANAR POLYMER LIGHT-EMITTING ELECTROCHEMICAL CELLS." Thesis, 2011. http://hdl.handle.net/1974/6513.

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Polymer light-emitting electrochemical cells (LECs) are unique solid-state light-emitting devices operating on the principle of in situ electrochemical doping and the formation of a p-n junction. Compared to conventional polymer light-emitting diodes, LECs possess some favorable device characteristics, making them attractive candidates for flat panel display applications. However, the underlying operating mechanism of LECs has been the subject of intense scrutiny and debate. The extremely large planar devices demonstrated by Dr. Gao’s group offer an unparalleled spatial resolution for investig
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Inayeh, Alex. "Scanning Photocurrent and Photoluminescence Imaging of Frozen Polymer Light Emitting Electrochemical Cells." Thesis, 2013. http://hdl.handle.net/1974/8051.

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A polymer light-emitting electrochemical cell (LEC) is a solid-state polymer device operating according to in situ electrochemical doping and the formation of a light-emitting polymer p-n junction. This operating mechanism, however, has been the subject of much debate. Planar LECs with millimeter scale interelectrode spacings offer great advantages for directly observing the electrochemical doping process. Photoluminescence quenching and the formation of a light-emitting junction have been observed in planar polymer LECs, demonstrating the existence of electrochemical doping. The chemical p
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Chen, Guan-Yu, and 陳冠宇. "Highly Efficient Cationic Iridium(III) Emitters for Light Emitting Electrochemical Cells (LECs)." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/78cfzr.

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碩士<br>靜宜大學<br>應用化學系<br>106<br>Organic light-emitting materials have been used in the fields of displays, lighting devices, healthcare, and the like. In this study, a series of novel ruthenium metal ion-type complexes in the form of [Ir(C^N)2(N^N)]+ PF6- were synthesized. This form is characterized by a base metal, surrounded by two negative-priced ligands and a zero-priced ligand. The highest occupied molecular orbital (HOMO) in this type of complex is usually distributed on the C^N ring metal ligand and on the metal. The lowest unoccupied molecular orbital (LUMO) is distributed on the N^N aux
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Yang, Chung-Kai, and 楊中凱. "UV Light-Emitting Electrochemical Cells." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/53924252220399290604.

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碩士<br>國立交通大學<br>影像與生醫光電研究所<br>100<br>The ultraviolet organic light-emitting devices (UV OLEDs) have potential applications not only in biomedical, biological sensors and etching technologies, but also in full-color displays and high-density information storage devices. Light-emitting electrochemical cells (LECs) devices have several advantages such as requiring only one single emissive layer that can be easily processed from solutions process, low bias voltage and using air-stable electrodes in comparison with OLEDs. In this work we fabricate the ultraviolet light-emitting electrochemical cell
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Kao, Ruei-Lin, and 高瑞霖. "Organic Polymer Light-Emitting Electrochemical Cells." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/2cfwwe.

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碩士<br>國立中央大學<br>光電科學與工程學系<br>104<br>In this thesis, we used of blends composed of poly(9,9-dioctylfluorene-alt-benzothiadiazole), F8BT and a ionic liquid ,tetradecyltrihexylphosphonium (trifluoromethylsulfonyl) amide (P66614-TFSA), as the active layer, in planar structure polymer light-emitting electrochemical cell (LEC) and sandwich structure LEC.We study the optic and electric property of the device,and compare the difference between using high and low molecular weight F8BT. First,the carrier mobility of difference molecular weight F8BT at carrier only device has been estimated by using spac
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Lu, Jung-Sheng, and 呂融昇. "Tandem Solid-state Light-Emitting Electrochemical Cells." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/10996752651717397012.

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碩士<br>國立交通大學<br>照明與能源光電研究所<br>102<br>Compared to organic light-emitting diodes (OLEDs), solid-state light-emitting electrochemical cells (LECs) exhibit simple single-layered structure and low operating voltages due to in-situ electrochemical doped layers. However, device efficiencies of LECs are usually lower than those of sophisticatedly designed OLEDs. Furthermore, device efficiencies and lifetimes of LECs degrade significantly as brightness increases. In this work, we demonstrate tandem LECs to obtain nearly doubled light outputs (μW cm-2) in comparison with single-layered LECs under simila
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Ho, Jian-Cheng, and 何健成. "High-Efficiency Infrared Light-Emitting Electrochemical Cells." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/11148030055609478430.

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碩士<br>國立交通大學<br>照明與能源光電研究所<br>99<br>The infrared technology has been applied to the fundamental study and practical applications in a number of important sectors for a long time. How to fabricate efficient and low-cost devices is always an important issue. Lightemitting electrochemical cells (LECs) devices show several advantages such as low cost, low bias voltage, and flexibility. But infrared LECs devices based on conjugate polymers or transition metal complexes exhibit low device efficiencies. In this work, the single-layered infrared LECs devices are fabricated by solution process. The emi
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chen, Po-hsien, and 陳柏賢. "Phosphorescent sensitized white light-emitting electrochemical cells." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/37291122306141571478.

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碩士<br>國立交通大學<br>光電科技學程<br>100<br>We report phosphorescent sensitized white light-emitting electrochemical cells (WLECs). The emission layer is host-guest system containing an efficient blue-green emitting phosphorescent ionic transition metal complex, [Ir(dfppz)2(dtb-bpy)]+(PF6─) as the host and an efficient red-emitting fluorescent dye, Sulforhodamine 101 as the guest. Phosphorescent sensitization was used to improve efficient of device. The device doped with 0.3 wt% guest concentration achieve peak EQE and power efficiency up to 7.9 % and 15.6 lm/W, respectively. Moreover, the device with 0.5
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Zhang, Yanguang. "Polymer Electrochemical Light-Emitting Devices and Photovoltaic Cells." Thesis, 2009. http://hdl.handle.net/1974/5354.

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Light-emitting electrochemical cells (LECs) are solid state polymer devices operating through the formation of a light-emitting p-n junction by in situ electrochemical doping. The LEC film contains a luminescent polymer and a polymer electrolyte. A sufficiently high voltage bias initiates the electrochemical p-doping reaction at the anode interface and n-doping reaction at the cathode interface. With time the doped regions expand in volume until they make contact to form a light-emitting p-n junction. In this thesis, I present my original research on both the light-emitting and photovoltaic p
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Lo, Chieh-Liang, and 羅价良. "Highly Efficient Solid-State Yellow Light-Emitting Electrochemical Cells." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/27vuag.

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碩士<br>國立交通大學<br>光電科技學程<br>108<br>In recent years, organic light-emitting diodes (OLEDs) have been widely studied for lighting and display applications due to their high contrast, wide viewing angle and low power consumption. Solid-state light-emitting electrochemical cells (LECs) based on ionic transition-metal complexes (iTMCs) have lower operating voltage than typical small-molecule OLEDs due to electrochemical doping. In addition, the solution-processable LECs have the potential in large-area displays. This thesis will be divided into three parts in optimizing electroluminescence (EL) effic
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37

Lu, Wei-Fu, and 盧巍夫. "Investigation of Ionic Properties in Light-Emitting Electrochemical Cells." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/89636386334350957325.

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碩士<br>國立交通大學<br>影像與生醫光電研究所<br>102<br>Comparing to OLEDs (organic light emitting diodes) and PLEDs (polymer light emitting diodes), light-emitting electrochemical cells(LECs) have advantages of simpler device configuration consisting of an organic thin-film layer between two air-stable electrodes, and capability to emit a broad light spectrum from near infrared to UV light. However, the LECs have disadvantages of short lifetime and lack of understanding on light emitting mechanism in relation to the ionic properties within the cells. The measured currents in the LECs’ organic layers have been t
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Wu, Po-Yi, and 吳柏嶧. "Laser Processing Technology Used in White Light-Emitting Electrochemical Cells." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/7b9m4e.

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碩士<br>國立交通大學<br>光電科技學程<br>105<br>In this study, 532-nm Nd: YAG solid-state laser is employed to fabricate surface plasmonic filters. By controlling the laser pulse frequency and power, the thin silver layer on the substrate is annealed and then transform into nanoparticles. The experimental results verify that patterning by laser annealing prevents using of shadow mask in etching processes, rendering quick producing the surface patterns. The laser annealing process can also selectively anneal silver nitrate film to induce reducing process to generate silver film. By adjusting the laser energy
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Chen, Yan-Zhi, and 陳彥志. "Highly Efficient Light-Emitting Electrochemical Cells Based on Diffusive Substrates." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/b89b89.

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碩士<br>國立交通大學<br>影像與生醫光電研究所<br>108<br>Solid-state light-emitting electrochemical cells (LECs) have many advantages, such as simple structure of single active layer, low-voltage operating, compatibility with inert cathode materials and solution process, which greatly reduce the difficulty of fabrication process. Therefore, studies on LECs have recently attracted much attention. Although many studies have made great efforts to improve the performance of materials, enhancing the device efficiency of LECs is still highly desired because of the limitations of the properties of materials themselves.
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Shen, Yu-Chun, and 沈宇駿. "Highly Efficient Double-Doped Solid-State White Light-Emitting Electrochemical Cells." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/66141533453018531885.

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碩士<br>國立交通大學<br>光電系統研究所<br>99<br>We report highly efficient solid-state white light-emitting electrochemical cells (LECs) based on a double-doped strategy, which additionally introduces an orange-emitting guest, [Ir(ppy)2(dasb)]+(PF6─) into a single-doped emissive layer containing an efficient blue-green emitting host, [Ir(dfppz)2(dtb-bpy)]+(PF6─) and a red-emitting guest, [Ir(ppy)2(biq)]+(PF6─) to improve carrier balance and thus to enhance the device efficiency. Photoluminescence (PL) measurements show that the single-doped (red guest) and the double-doped (red and orange guests) host-guest
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Kuo, Jung-Chin, and 郭榮欽. "White Light-Emitting Electrochemical Cells Employing Embedded Red Color Conversion Layers." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/24491093917221101310.

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碩士<br>國立交通大學<br>光電科技學程<br>102<br>Highly efficient white light-emitting electro chemical cells (LECs) are realized by employing an embedded red color conversion (CCL) between the blue-emitting emissive layer and the substrate. White emission is composed of the blue electroluminescence (EL) and the red photoluminescence (PL) resulted from absorption of the blue EL in the CCL and subsequent energy transfer. The efficient red-emitting dye is properly chosen to exhibit significant spectrum overlap band of the blue EL. Low doping concentration of the red dye in the CCL is beneficial in reducing sel
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Chang, Bo-Ren, and 張伯任. "Near Infrared Light-Emitting Electrochemical Cells Based on Cationic Iridium Complexes." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/u4fkr2.

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碩士<br>國立交通大學<br>照明與能源光電研究所<br>106<br>Orangic light-emitting devices (OLED) have attracted attention in near-infrared (NIR) applications due to advantages of low power consumption and compatibility with large area and flexible substrates. But OLED typically require sophisticated multilayer structures and low-work-function cathodes to optimize device efficiencies, which limits their commercial realization. Solid-state light-emitting electrochemical cells (LEC) provide solution processablility, simple device architecture and compatibility with air stable metals, which can be more easily processed
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劉柏村. "White Light-Emitting Electrochemical Cells Based on Single-Component Polyfluorene Electrolytes." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/31671032490631900061.

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碩士<br>國立交通大學<br>照明與能源光電研究所<br>101<br>A series of polyfluorene (PF) electrolytes bearing BF4－, or PF6－ counterions were used in light-emitting electrochemical cells (LECs). 2,1,3-Benzoselenadiazole moieties were incorporated into polymer main chains to produce single-component white light-emitting polymers. The optimized spin-coated LECs showed a maximum power efficiency of 1.56 lm/W at a low operation bias of 3 V. The single-component LEC device exhibited pure white light emission with CIE'1931 coordinates approaching (0.33, 0.33) and high color rendering index (CRI) >85, referring to its pote
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Hohertz, DONNA. "HOW ELECTRODE MATERIAL AFFECTS THE PERFORMANCE OF POLYMER LIGHT-EMITTING ELECTROCHEMICAL CELLS." Thesis, 2008. http://hdl.handle.net/1974/1466.

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Polymer light emitting electrochemical cells (LECs) are solid-state devices containing an active layer blend of luminescent polymer, ion transport material and salt sandwiched between two electrodes. They operate on the principal of in situ electrochemical doping. Doping entails the injection of electronic charge from the electrodes, causing the reduction/oxidization of the luminescent polymer, and accompanied by charge compensation through the redistribution of salt counter-ions. Due to the high conductivity of the doped polymer, a fully turned on LEC has a dramatically reduced contact and bu
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Chiu, Chih-Hung, and 邱至宏. "Non-Doped Solid-State White Light-Emitting Electrochemical Cells Employing Microcavity Effect." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/84541110745351204032.

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碩士<br>國立交通大學<br>光電科技學程<br>103<br>Solid-state white light-emitting electrochemical cells (LECs) have attracted research attention owing to their advantages of simple device structure, low operation voltage and compatibility with solution processes. In this work, we demonstrate a simple approach to obtain white electroluminescence (EL) from non-doped LECs based on a single blue-emitting complex. With a relatively thicker emissive layer, red emission can be additionally enhanced by microcavity effect when the recombination zone moves to proper positions. Hence, white EL can be harvested by combin
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Shih, Hsien-Chang, and 施憲璋. "Plasmonic Enhancement in Electroluminescence from Light-Emitting Electrochemical Cells Incorporating Gold Nanourchins." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/04854026082692659946.

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碩士<br>國立交通大學<br>照明與能源光電研究所<br>104<br>Solid-state light-emitting electrochemical cells (LECs) have received intense scientific attention since they show advantages of simple device structure, low-voltage operation and compatibility with air-stable electrode metals. To further improve device performance, enhanced electroluminescence (EL) from localized surface plasmon (SP) resonance in LECs incorporating gold nanourchins (NUs) at the anode is demonstrated. With gold NUs, peak device efficiency of thinner LECs (140 nm) can be enhanced by 35%. However, gold NUs result in no enhancement in EL for t
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Shi, Hong-Yu, and 施宏昱. "Performance Enhancement in Organic Electrochemical Light-Emitting Cells by Blending of Polymers." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/42167933913739647921.

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碩士<br>國立中興大學<br>電機工程學系所<br>105<br>In this study, Ru(bpy)3(pF6)2 was used as the luminescent material and was adopted the same weight of 35 mg to blend with concentration 1.5 wt% PVA、 PEO、PMMA、PEDOT:PSS solution respectively, and then spin-coated to form a film constitute the active layer. The Ru(bpy)3(pF6)2 may be wrapped by polymer after blending, reducing the chances of Ru(bpy)32﹢absorb moisture in the air, improve the stability of devices. In addition, a layer of lithium fluoride (LiF) was further vapor deposited on the Ru(bpy)3(pF6)2 and polymer mixture, reduce the electron injection ener
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Chang, Yi, and 張毅. "White Light-Emitting Electrochemical Cells Based on Ionic Polyfluorene Derivatives Containing Iridium Complexes." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/nmsc9v.

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碩士<br>國立交通大學<br>影像與生醫光電研究所<br>103<br>In this work, ionic polyfluorenes were utilized in active layers of white light-emitting electrochemical cells (WLECs) .Red-emitting iridium complexes were incorporated into polymer main chains to produce single-component white light-emitting polymers. By using ionic polyfluorenes, white-light LECs showed advantages of low operation voltage, without adding additional salts or poly(ethylene oxide)(PEO) .The single-component LEC device exhibited pure white light emission with CIE'1931 coordinates approaching (0.33, 0.33) and high color rendering index (CRI) >
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Lee, Hsiao-Chin, and 李曉菁. "Laser-Scanned Programmable Color Temperature of Electroluminescence from White Light-Emitting Electrochemical Cells." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/7j9w56.

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碩士<br>國立交通大學<br>影像與生醫光電研究所<br>105<br>Recently, the control of correlated color temperature (CCT) of artificial solid-state white-light sources starts to attract more attention since CTs affect human physiology and health profoundly. In this work, we proposed and demonstrated a method that can widely tune the CCTs of electroluminescence (EL) from white-light-emitting electrochemical cells (LECs) by employing plasmonic filters. These integrated on-chip plasmonic filters are composed of semicontinuous thin Ag film or Ag nanoparticles (NPs) both included in the indium tin oxide anode contact, whic
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Yu, Guang-Xiang, and 余光祥. "Efficient and saturated red light-emitting electrochemical cells based on cationic iridium complexes." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/g69qnf.

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碩士<br>國立交通大學<br>照明與能源光電研究所<br>108<br>Solid-state light-emitting electrochemical cells (LECs) show several advantages such as low-voltage operation, simpler solution-processable, compatibility with inert metal electrodes and large-area flexible substrates. These promising properties ensure their potential application in low-cost displays. Saturated red light sources, which exhibit emission peak approaching 650 nm, are essential for full-color displays since they can generate large color gamut. The display with wider color gamut bring a more gorgeous and full color style to viewers. Several work
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