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Dissertations / Theses on the topic 'Polymer light emitting diodes'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Liu, Yee-Chen. "Polymer blend light-emitting diodes." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610709.

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2

Fehrman, Stephen A. "Passivation of polymer light-emitting diodes." Click here to view, 2009. http://digitalcommons.calpoly.edu/eesp/19/.

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Thesis (B.S.)--California Polytechnic State University, 2009.<br>Project advisor: David Braun. Title from PDF title page; viewed on Jan. 28, 2010. Includes bibliographical references. Also available on microfiche.

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3

Lu, Li Ping. "Highly efficient hybrid polymer light-emitting diodes." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607808.

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4

Mitchell, William John. "Polymer-electrode interactions in light emitting diodes." Thesis, University of Oxford, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289406.

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5

Ho, P. K. H. "Novel architectures for polymer light-emitting diodes." Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604103.

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This dissertation work aims to develop novel optoelectronic polymer device architectures through appropriate control of the interfacial and bulk structures of the semiconducting polymer. The two approaches developed here are the hole-injection interlayer engineering via the layer-by-layer polyelectrolyte assembly, and refractive-index engineering via the use of polymer-inorganic nanocomposites. The poly-electrolyte assembly route enables vertical interfacial structuring of the electronic properties to be achieved at the anode contact for improved hole injection and electron confinement. The de

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6

Baigent, Derek Ralph. "Polymer electroluminescent devices." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296712.

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7

Barlow, Iain Alistair. "Transient electroluminescence from conjugated polymer light-emitting diodes." Thesis, University of Sheffield, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.489368.

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8

Brewer, Paul James. "Internal field screening in polymer light emitting diodes." Thesis, Imperial College London, 2005. http://hdl.handle.net/10044/1/7555.

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9

Bodrozic, Vladimir. "Electroabsorption investigations of advanced polymer light-emitting diodes." Thesis, University College London (University of London), 2005. http://discovery.ucl.ac.uk/1445319/.

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In this thesis we employ electroabsorption (EA) spectroscopy in the study of encapsulated blue polymer light-emitting diodes (PLEDs), introduced generally in Chapter 1, that also incorporate a hole injection layer poly(3,4-ethylene dioxythio- phene) doped with poly(styrene sulfonate) (PEDOT:PSS). In addition to providing valuable information about the polymer film, EA. described in Chapter 2, allows the probing of the built-in voltage, Vbi, generated through the equilibration of the chemical potential across the PLED heterostructure. Typically, VBI is measured by applying a voltage of the form

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10

Schmit, Jean-Paul. "Novel polymers for applications in light emitting diodes." Thesis, Lancaster University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322867.

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11

Niu, Quan [Verfasser]. "Electrical degradation of polymer light-emitting diodes / Quan Niu." Mainz : Universitätsbibliothek Mainz, 2017. http://d-nb.info/1140936182/34.

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12

Pinner, Dickon John. "Pulsed electrical excitation of conjugated polymer light-emitting diodes." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620940.

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13

Jin, Rui. "Investigating the Operating Mechanisms of Polymer Light Emitting Diodes." Thesis, Imperial College London, 2009. http://hdl.handle.net/10044/1/4375.

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This work uses a broad range of optoelectronic characterisation techniques tounderstand ? at a fundamental level ? the operating mechanisms of PLEDs. Theelectromodulation (EM) technique particularly provides a straightforward means ofdetermining the electric field strength inside operational devices, and is used here toinvestigate the improved device performance due to the insertion of an interlayerbetween the anode and the emissive layer. The effects of different interlayer materials(hole-transporting polymeric materials and one crosslinkable material) are studied in red,green and blue PLEDs.

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14

Dhoot, Anoop Singh. "Optical probing of excited states in conjugated polymer devices." Thesis, University of Cambridge, 2001. https://www.repository.cam.ac.uk/handle/1810/272179.

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15

Webster, Graham R. "Advanced polymers for light emitting diodes." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393551.

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16

Brown, T. M. "Electroabsorption investigations of polymer light-emitting diodes with efficient electrodes." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596974.

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This thesis is concerned with the application of electroabsorption (EA) spectroscopy to study conjugated polymer light-emitting diodes (PLEDs). Firstly, the design and development of an electroabsorption system that enables the accurate measurement of the built-in potential in PLEDs is described. The EA spectrometer is utilized to investigate PLEDs with advanced structures for effective injection of both types of carriers. A common fundamental structure for PLEDs is the Indium-Tin-Oxide(ITO)/Polymer/Ca-Al sandwich structure. In order to fabricate efficient devices, alterations to this basic st

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17

Corcoran, Nicholas. "Polymer light-emitting diodes : the influence of morphology and structure." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597998.

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The work presented in this thesis focuses on the influence of morphology and device structure on the performance of polyfluorene light-emitting diodes (LEDs). The influence of blend morphology has been investigated by considering how certain processing parameters give rise to different blend morphologies and the impact these morphologies have on device characteristics and efficiency. An understanding of how different blend morphologies arise has allowed the development of techniques to control blend morphology. In this way, vertically segregated polymer blend devices have been fabricated that

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18

Kim, Ji Seon. "Polymer light-emitting diodes : anode surface conditioning and device performance." Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621783.

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19

Matterson, Benjamin James. "Photonic effects in microstructured conjugated polymer films and light emitting diodes." Thesis, Durham University, 2002. http://etheses.dur.ac.uk/4181/.

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This thesis reports an investigation into the photonic effects caused by wavelength scale micro structure patterned onto films of conjugated polymers. The efficiency of light emitting diodes (LEDs) made from conjugated polymers is limited in part by the trapping of light into waveguide modes caused by the high refractive index of these materials. Waveguide modes in films of poly(p-phenylene vinylene) (PPV) and poly(2-methoxy, 5-(2'ethylhexyloxy)-p-phenylene vinylene) (MEH-PPV) are analysed and the refi-active index of these materials is calculated. The photoluminescence of conjugated polymer f

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20

Hayer, Anna. "Excited state formation, stabilisation and decay in polymer light-emitting diodes." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613996.

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21

Tokmoldin, Nurlan. "Fabrication and characterization of hybrid metal-oxide/polymer light-emitting diodes." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/6327.

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Hybrid metal-oxide/polymer light-emitting diodes (HyLEDs) are a novel class of electronic devices based on a combination of electroluminescent organic and charge-injecting metal-oxide components. These devices employ air-stable electrodes, such as ITO and Au, and are therefore well suited for fabrication of encapsulation-free light-emitting devices. The current work is intended to provide an insight into operating mechanisms and limitations of the HyLEDs, and, on the basis of this knowledge, aims at modifying the device architecture in order to improve the performance. The choice of optically

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22

Evans, N. R. "Phosphorescent conjugated polymers for light-emitting diodes." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598900.

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This dissertation describes work done to improve the efficiency of conjugated-polymer organic light-emitting diodes (OLEDs) by harvesting both singlet and triplet excitons as electroluminescence. The electroluminescence quantum efficiencies of OLEDs based on the fluorescent conjugated polymer poly(9,9-dioctyl-9<i>H</i>-fluorene-2,7-diyl) 1.08 have been improved through the design, synthesis and application of new phosphorescent conjugated polymers. A study of simple blends of phosphorescent dopants with the polymer 1.08 showed that the red-phosphorescent dopant 2.15 is better suited for observ

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23

Gu, Hang. "Magnetoresistance and doping effects in conjugated polymer-based organic light emitting diodes." Thesis, Queen Mary, University of London, 2015. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8940.

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Magnetoresistance (MR) and doping effects have been investigated in a poly(3-hexylthiophene-2,5-diyl) (P3HT) based organic light emitting diodes. In single device of fixed composition (Au/P3HT/Al as spun and processed in air), the measured MR strongly depends on the drive conditions. The magnetoconductance (MC) varies from negative to positive (-0.4% ≤ MC ≤ 0.4%) with increasing current density, depending on which microscopic mechanism dominates. The negative MC is due to bipolaron based interactions and the positive MC to triplet-polaron based interactions (as confirmed by light emission). Ox

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24

Kimyonok, Alpay. "Side-chain functionalized luminescent polymers for organic light-emitting diode applications." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/29649.

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Thesis (Ph. D.)--Chemistry and Biochemistry, Georgia Institute of Technology, 2009.<br>Committee Chair: Weck, Marcus; Committee Member: Christopher Jones; Committee Member: Jean-Luc Bredas; Committee Member: Joseph Perry; Committee Member: Laren M. Tolbert. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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25

Costa, Dantas Faria Jorge. "Effect of polymer and metal oxide properties on hybrid light emitting diodes." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/43381.

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Hybrid organic/inorganic light-emitting diodes (HyLEDs) combine thin, metal oxide layers together with light-emitting organic semiconductors to create devices that are more resilient to ambient conditions than standard devices. In this thesis, HyLED performance is measured as a function of the individual organic and oxide layer properties with the aims of addressing several perceived gaps within reported literature and to consequently optimise future device design. Reported herein are the results of the insertion of a vertical zinc oxide nanorod array as a non-planar, bottom-cathode electron i

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26

Dailey, Stuart. "A study of conjugated polymers and their applications in light-emitting diodes." Thesis, Durham University, 1998. http://etheses.dur.ac.uk/4744/.

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The initiation of research into conjugated polymer electroluminescent devices in Durham is reported. The apparatus required for the fabrication and characterisation of polymer light-emitting diodes (LEDs) is outlined, and the essential assumptions and calculations required to determine their efficiency, brightness and colour are summarised. Optical and electrical characterisation of a range of polymers is reported, including polypyridine (PPY) and a range derivatives, poly(p-phenylene vinylene) (PPV) and poly(2-methoxy, 5-(2'ethyl-hexyloxy)-p-phenylene vinylene) (MEH-PPV). The optical properti

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27

Vaeth, Kathleen Michelle 1972. "Parylene-based chemical vapor deposition of electroluminescent polymer films used in polymer light emitting diodes." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9111.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1999.<br>Includes bibliographical references (leaves 136-143).<br>The effects of reaction and deposition conditions on the properties of the conjugated electroluminescent polymer poly(p-phenylene vinylene) (PPV) prepared by parylene-based chemical vapor deposition (CVD) are explored in this thesis. A reactor for CVD of PPV is designed and constructed, and both a,a'-dibromo p-xylene and a,a.'-dichloro p-xylene are tested as source monomers. By sufficiently baking out the CVD system, reproducible fabrication of

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28

Herguth, Petra. "Development and synthesis of luminescent conjugated copolymers and their fabrication into polymer light-emitting diodes /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/10587.

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29

Chan, Khai Leok. "Fluorescence and phosphorescence in polymeric light-emitting diodes." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597421.

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This dissertation describes work done to improve the stability and efficiency of conjugated-polymer organic light-emitting diodes (OLEDs) through the design of novel polymers. The work begins with an investigation of the failure mechanism for the most widely used blue emitter, polyfluorene 1.11. Using fluorenone-containing oligofluorenes as model compounds, it was established that oxidation at the fluorine bridgehead followed by fluorenone excimer formation was responsible for the emergence of low energy bands in the emission spectrum of polyfluorene 1.11 following degradation. The problem of

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30

Liu, Shi. "Development of novel conjugated polymers for light-emitting diodes /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/10569.

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31

Chang, S. M. "Synthesis of blue fluorescent polymers for light emitting diodes." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597462.

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The main objective of the project was to synthesise electroluminescent polymers for blue light-emitting diodes (LEDs) which are a particularly attractive target for research. Blue inorganic LEDs only recently became available, and polymers offer the advantages of low cost and solution processibility. This facilities the fabrication of large-area devices by spin-coating techniques. The following dissertation is comprised of five chapters. Chapter 1 gives a general overview of the application of conjugated polymers in LEDs. Chapter 2 is the literature cited on organic blue electroluminescent (EL

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32

Chang, Mau-Shang, and 張貿翔. "Top-emitting Polymer Light-emitting Diodes." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/67891518469301255707.

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碩士<br>國立成功大學<br>微電子工程研究所碩博士班<br>94<br>Recently, polymer light-emitting diodes (PLEDs) have been significantly fabricated with top-emitting architecture. The emission intensity enhancement and narrowing electroluminescence (EL) spectrum can be attributed to microcavity effects. In this thesis, a top-emitting structure was Glass/ITO/Ag(120nm)/PEDOT:PSS(40nm)/DB-PPV/Ca(10nm)/Ag, and then the device emitted light through the cathode side Ca/Ag. The polymer emissive layer was DB-PPV (2,3-dibutoxy 1,4-poly(phenylene vinylene)), which was sandwiched between two metal electrodes. One electrode was the

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33

Susac, Darija. "Interfaces for polymer light emitting diodes." Thesis, 1999. http://hdl.handle.net/2429/9092.

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Interfaces in polymer light emitting diodes (PLED) made from poly(l,4 phenylene vinylene) (PPV) on indium tin oxide (ITO) substrate with evaporated Mg as a negative electrode, have been studied by X-ray photoelectron spectroscopy (XPS). Thin films of PPV on LTO were prepared by thermal conversion of undialyzed and dialyzed sulfonium precursor polymer, and Mg was evaporated on top under high vacuum conditions. Characterization of PPV by XPS indicated that two different polymer surfaces are obtained by using undialyzed and dialyzed precursor polymer. Without dialysis, more oxygen impuritie

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34

Tseng, Shin-Rong, and 曾信榮. "Study of Multilayer Polymer Light-Emitting Diodes." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/69655803193988217233.

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博士<br>國立交通大學<br>物理研究所<br>96<br>In this study we want to achieve high-efficiency polymer light-emitting diodes (PLED) by proper multilayer device structure design. We found the main factor to decide the efficiency would be the electron-hole balance, especially the electron currents in devices. The electron-hole balance can be achieved by multilayer structure. However the multilayer structure is difficult to achieve by solution process due to the fact that the mutual dissolution problem between layers. We have developed two ways to overcome the dissolution problem and to achieve multilayer struc

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35

Yi, Huang Ming, and 黃明義. "Interface Modification of Polymer Light Emitting Diodes." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/65167732514559194181.

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碩士<br>國立臺灣大學<br>化學研究所<br>90<br>Recently, organic light emitting diodes (OLEDs) play an important role in display technology field because they have a lot of advantages, such as self-luminescence, low electricity consuming, widely viewing angle, fast response time, and high contrast. Most researches are to develop new luminescent materials. However, little researches are to study the problems of the interface. It is said that there are some kinds of energy gap between the indium tin oxide (ITO) (or metal electrode) and conjugate polymer layer. Existing energy gap causes the low luminescent effi

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36

Huang, Wei-Bin, and 黃瑋斌. "Flexible Top-Emission Polymer Light-Emitting Diodes." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/57866946319451939785.

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碩士<br>國立成功大學<br>微電子工程研究所碩博士班<br>97<br>The primary research of my thesis is the fabrication of flexible top-emission polymer light-emitting diode (FTPLED) based on two polymer,"High yellow" poly (para-phenylene vinylene) (HYPPV) as a green-yellow emitter, and Blue255 polymer as a new blue emitter. Three different flexible substrates: Cyclo olefin copolymer(COC)、poly(ethy1ene naphthalate)(PEN) and Poly(ethylene terephthalate) (PET) are used in my research. At first, we would find the best polymer concentration and make the parameter to imitate a emission layer of FTPLED. In my study, the fundame

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Wang, Wen-Sheng, and 王文生. "Investigation of Polarized Polymer Light-Emitting Diodes." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/47475020015813497241.

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碩士<br>國立交通大學<br>顯示科技研究所<br>95<br>One novel conducting alignment layer, fabricated by blending conducting polymer “PEDOT:PSS” with water-soluble polymer, polyvinylalcohol, has been demonstrated successfully to align polyfluorenes by mechanical rubbing technique. The alignment layer has been also used to fabricate polarized polymer light-emitting diodes (PLEDs). Highly polarized emission with an integrated dichroic ratio up to 28.6 and high luminance with more than 850 cd/m2 has been observed from the polarized PLED after adapting different kinds of cathode structures.

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38

Chen, Yung Ting, and 陳勇廷. "Investigation of doped polymer light-emitting diodes." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/55286336694731799108.

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碩士<br>長庚大學<br>電子工程研究所<br>93<br>Polymer light emitting diodes (PLEDs) an significant role in display technology field because they had a lot of advantages, such as, broadly viewing angle, fast response time, self-luminescence and high contrast. Organic-inorganic hybrid materials have been extensively studied recently. We will manufacture doped polymer light emitting diodes and study theirs photoelectric effects. Our experiment will divide into several sections. (1)We present the consequences of a study on how the spin- coating PEDOT of hole injection layer conditions affects the morphology of p

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39

Zhang, Jin-Cheng, and 張晉誠. "Polymer light emitting diodes based on diblock copolymer." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/95440704138664802238.

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碩士<br>國立中正大學<br>物理所<br>95<br>-b-PI層的結構，亮度高出1.6倍、效率高出1.44倍。 Abstract Various physical properties of a polystyrene-b-polyisoprene diblock copolymer chemisorption with gold nanoparticles (PS-b-PI-Au) and a polystyrene-b-polyisoprene (PS-b-PI) diblock copolymer were investigated, and the results were used to study the feasibility of empolying the polymer thin film as a hole-block interlayer for a polymer light emitting diode (PLED) device. The design of blue PLED divice studied in this work was structured with the layout ITO/PEDOT/PS-b-PI or PS-b-PI-Au/PFO/Ca/Al, in which ITO was used as an anode,

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40

Tsai, Sung-Hao, and 蔡松豪. "The study of electrophosphorescent polymer light-emitting diodes." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/88653207163938068358.

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碩士<br>國立成功大學<br>光電科學與工程研究所<br>94<br>In this study, we investigated the photoelectric properties of polymer phosphorescence light emitting diodes, which are made of three different polymers(PVK、UV、PF ) as hosts doped respectively six phosphorescence materials with different functional group molecules. Thus, these PLEDs with high luminance and high quantum efficiency are measured and reported. 　　The research included two parts, red phosphorescence doping and green phosphorescence doping. In the first part, the result of the three host polymers doped with three red dopants respectively with diff

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Kuan-HongJou and 周冠宏. "Improvement of Polymer Light-Emitting Diodes by Laser Annealing." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/85599979598972841032.

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碩士<br>國立成功大學<br>微電子工程研究所碩博士班<br>100<br>In this thesis, we concentrate on how to improve the performance of poly [2-methoxy-5- (2’-ethylhexyloxy)- 1,4-phenylene vinylene] MEH-PPV-based light emitting diodes by different methods of annealing. We adopted 532 nm green laser as the annealing source because the maximum intensity of MEH-PPV absorption spectrum is at the range of green light. In addition, we researched into the influence of emitting layer under different conditions of laser annealing which improve the physical property of emitting layer and device performance. In our experiments, we b

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Teng, Jen Wei, and 鄧人維. "Temperature-dependent characteristics of the polymer light-emitting diodes." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/60908256393330758928.

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碩士<br>長庚大學<br>光電工程研究所<br>97<br>In this work, we reported the organic semiconductor devices of disorder materials concerning the thermal-related attributes arising from ITO/PEDOT/PFO/Ca/Al polymer light-emitting diode (PLEDs) structure. The characteristics of device have been studies as temperature- and excitation-dependent measurement of electroluminescence (EL). The temperature- and current-dependent EL spectra from the sample were measured over a temperature range from 300 to 20 K with current 0.5 mA and 0.1 mA and explained well by the localized carrier hopping and thermalization process. F

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43

Lee, C. C., and 李靜純. "Enhanced Performance in Organic -Polymer Light-Emitting Diodes (OPLED)." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/28216345030476033321.

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碩士<br>南台科技大學<br>電機工程系<br>92<br>The main advantage of PLED beyond other large flat panel displays (FPD) is their ease of fabrication because the polymer solutions can be used spin-coating method. In order to satisfy the requirements, which are quite durable, light and thin on the flat display, it is essential technology for flexible polymer light-emitting diodes (FPLED) such as etching process of indium-tin oxide (ITO) on polyethylene terephtalate (PET). Indium tin oxide (90 wt.% In2O3; 10 wt.% SnO2; ITO) thin films used for the fabrication of display devices are required high optical transmitt

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Shih, Yi-Hong, and 史翊宏. "Application of nanoimprint lithography on polymer light-emitting diodes." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/wtw27j.

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碩士<br>國立嘉義大學<br>電子物理學系光電暨固態電子研究所<br>106<br>Due to mismatch of the polymer light-emitting diode(PLED) structure, the extraction efficiency has to be limited to about 25%. Most of the light is confined in the transparent substrate and the organic layers. Only about 40% of light is trapped in the substrate. Therefore, how to improve the PLED efficiency of extracting is an important issue in contemporary. In this study, nanoimprint lithography technology is used to fabricate nanostructure onto PC substrate. The cobalt substrate is used as our imprint mold and patterned nanometer grating structures

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45

Yen, Jui-Hsiang, and 顏瑞祥. "Single-Layer Polymer Light-Emitting Diodes With White Emission." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/87489793822129868012.

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碩士<br>國立交通大學<br>電機學院光電顯示科技產業專班<br>95<br>In this study, highly efficient single-layer polymer light-emitting diodes (PLEDs) with white emission have been demonstrated. The device structure is ITO/PEDOT:PSS/Host:Dopant/Cs2CO3/Al, where the host material is poly[9,9-di-(2-ethylhexyl)-fluorenyl-2,7-diyl] end capped with N,N-Bis(4-methyl[henyl]-4-aniline (PF2/6am4); the Dopant is Bis(2-(9,9-dihexylfluorenyl)-1-pyridine)(acetylacetonate) irdium (III). After finely tuning of the dopant concentration, white emission has been achieved. It is also found that the device efficiency could be enhanced after

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46

Tsai, Min-Ran, and 蔡明燃. "Effects of Carrier Trap in Polymer Light Emitting Diodes." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/u9bqyh.

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碩士<br>國立交通大學<br>物理研究所<br>92<br>This thesis represents the effects of traps in polymer light-emitting diodes. In electron only devices,the electron conduction in polymer is strongly reduced by the presence of traps. Putting more traps, we find stronger electric field dependence in electron current density. If we apply larger voltage, because more traps are filled, electron current is approaching to the hole current density. Traps not only reduce the current in electron only devices, but also increase the time required for device reaching the steady state. In our simulation, we represent that tr

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Ascarovich, Assylbekov-Rauan, and 勞萬. "Polymer/metal junction interface on the performance of polymer light-emitting diodes." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/48084599853407762931.

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碩士<br>國立成功大學<br>光電科學與工程研究所<br>97<br>We report the effect of polymer-insulating layer on electron injection in the polymer light-emitting diodes (PLEDs). Several different polymer layers with varying number of carbon groups (C-O), (C-C-C-O), (C-C-C-C-O) and (C-C-N) were placed between the emitting layer and the aluminum cathode, and their influence on the device performance was investigated. T.F Guo et.al reported that XPS and UPS measurements for PEO showed that polymer/Al junction consist the strong C-Al bond, which wasn’t observe in case of single Al cathode. PLEDs with our alternative mater

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Lai, Hsiao-Han, and 賴筱涵. "All Solution Process for Multilayer Structured Polymer Light-emitting Diodes." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/16327372649295098463.

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碩士<br>臺灣大學<br>高分子科學與工程學研究所<br>98<br>Polymer light-emitting diodes (PLEDs), as a branch of organic electroluminescence (OEL), are mainly fabricated by solution based wet process. To improve device performance, multilayer structured device is absolute necessary. However, the choices of solvents are limited; this means that the “like dissolves like effect” had to be carefully avoided or the predeposited layer will be destroyed by the incoming layer. In this thesis, we have demonstrated an all solution process to fabricate multilayer layer structured PLEDs. By carefully selecting the materials and

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Yu-ChunLin and 林鈺珺. "Polyethyleneimine/metal functionalized cathode in efficient polymer light-emitting diodes." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/58635612923332246839.

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碩士<br>國立成功大學<br>光電科學與工程學系<br>100<br>In this work, we report the highly efficient yellow polymer light-emitting diodes (PLEDs) achieved by introducing a soluble polyethyleneimine (PEI) between the high work-function cathodes and the polymer emitting layer (PDY-132). It reduces the barrier height between emitting layer and cathode, and therefore improves device performance. The mechanisms of polyethyleneimine as electron injection layer (EIL) to increase the electron injection are 1. Interfacial dipole between Polyethylenimine/metal can change the vacuum energy level thus reduces the barrier hei

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Hsu, Hung-Wei, and 許紘瑋. "The patterning method for solution-processed polymer light-emitting diodes." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/46930326529358024892.

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碩士<br>國立清華大學<br>光電工程研究所<br>97<br>Multilayer structure polymer light-emitting diodes (PLEDs) with a patterned second emission layer are presented. We utilize polydimethylsiloxane (PDMS) mask combined with blade coating method to fabricate multilayer patterned PLEDs by solution process. Multilayer structure and patterned emission layer are achieved by blade coating and a PDMS mask, respectively. Owing to the elasticity and good adhesion of PDMS mask, it can stick on the first emission layer very tightly without any damage on the emission layer. The second emission layer is then blade coated wi

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