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Dissertations / Theses on the topic 'Light emitting'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Chen, Chih-Lei. "Processing light-emitting dendrimers for organic light-emitting diodes." Thesis, University of Oxford, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.489420.

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Light-emitting dendrimers with iridium(III) complex cores have given rise to some of the simplest and most efficient organic light-emitting diodes. However, whilst monochrome devices can be prepared there is currently no method for the patterning of the dendrimer films to give rise to pixelated colour displays. The main aim of this project was to develop methodology for the patterning of dendrimer films. In particular, dendrimers are designed that have an oxetane surface group that can be crosslinked to form patterns by a photo-generated acid.

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2

O, Yin Wan. "White light organic light emitting device." HKBU Institutional Repository, 2008. http://repository.hkbu.edu.hk/etd_ra/907.

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3

Schwab, Tobias. "Top-Emitting OLEDs." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-157992.

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In the last decades, investigations of organic light-emitting diodes (OLEDs) have tackled several key challenges of this lighting technology and have brought the electron to photon conversion efficiency close to unity. However, currently only 20% to 30% of the photons can typically be extracted from OLED structures, as total internal reflection traps the major amount of the generated light inside the devices. This work focuses on the optimization of the optical properties of top-emitting OLEDs, in which the emission is directed away from the substrate. In this case, opaque materials, e.g. a

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4

Stevenson, Stuart G. "Dendrimer light-emitting diodes." Thesis, St Andrews, 2008. http://hdl.handle.net/10023/581.

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5

Liu, Jiang. "Light-Emitting Electrochemical Transistors." Doctoral thesis, Linköpings universitet, Fysik och elektroteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-104925.

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Since the discovery of conductive polymers in 1977, the implementation of organic conjugated materials in electronic applications has been of great interest in both industry and academia. The goal of organic electronics is to realize large-area, inexpensive and mechanically-flexible electronic applications. Organic light emitting diodes (OLEDs), as the first commercial product made from organic conjugated polymers, have successfully demonstrated that organic electronics can make possible a new generation of modern electronics. However, OLEDs are highly sensitive to materials selection and requ

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Дядечко, Алла Миколаївна, Алла Николаевна Дядечко, Alla Mykolaivna Diadechko, and D. V. Shapko. "Organic light-emitting diode." Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/13445.

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An organic light emitting diode (OLED) is a light-emitting diode (LED) in which the emissive electroluminescent layer is a film of organic compounds which emit light in response to an electric current. This layer of organic semiconductor material is situated between two electrodes. Generally, at least one of these electrodes is transparent. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/13445

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7

Choi, Wai Kit. "Organic light-emitting diodes." HKBU Institutional Repository, 1999. http://repository.hkbu.edu.hk/etd_ra/190.

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8

Najafabadi, Ehsan. "Stacked inverted top-emitting white organic light-emitting diodes." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52990.

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The majority of research on Organic Light-Emitting Diodes (OLEDs) has focused on a top-cathode, conventional bottom-emitting architecture. Yet bottom-cathode, inverted top-emitting OLEDs offer some advantages from an applications point of view. In this thesis, the development of high performance green electroluminescent inverted top-emitting diodes is first presented. The challenges in producing an inverted structure are discussed and the advantages of high efficiency inverted top-emitting OLEDs are provided. Next, the transition to a stacked architecture with separate orange and blue emitting

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9

Leirset, Erlend. "Photonic crystal light emitting diode." Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-10014.

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<p>This master's thesis describe electromagnetic simulations of a gallium antimonide (GaSb) light emitting diode, LED. A problem for such devices is that most of the generated light is reflected from the surface due to total internal reflection, and is therefore prevented from coupling out of the semiconductor material. Etching out a 2D photonic crystal grating on the LED surface would put aside the absolute rule of total internal reflection, and could therefore be used to increase the total transmission. The simulation method which was developed was supposed to find geometry parameters for th

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10

Rosenow, Thomas. "White Organic Light Emitting Diodes." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-67342.

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Die vorliegende Arbeit beschäftigt sich mit drei Ansätzen der hocheffizienten Erzeugung von weißem Licht mit organischen Leuchtdioden (OLEDs) auf der Basis kleiner Moleküle. Ein Ansatz kombiniert die Emission eines fluoreszenten und zweier phosphoreszenter Emitter in einer einzelnen Emissionsschicht. Da das Triplettniveau des verwendeten Blauemitters niedriger ist als die Triplettniveaus der phosphoreszenten Emitter, werden die Konzentrationen der Emitter so gewählt, dass ein Exzitonenübertrag zwischen ihnen unterbunden wird. Die strahlungslose Rekombination von Tripletts auf dem fluoreszente

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11

Thomschke, Michael. "Inverted Organic Light Emitting Diodes." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-106255.

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This study focuses on the investigation of the key parameters that determine the optical and electrical characteristics of inverted top-emitting organic light emitting diodes (OLED). A co-deposition of small molecules in vacuum is used to establish electrically doped films that are applied in n-i-p layered devices. The knowledge about the functionality of each layer and parameter is important to develop efficient strategies to reach outstanding device performances. In the first part, the thin film optics of top-emitting OLEDs are investigated, focusing on light extraction via cavity tuning, e

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12

Gray, Jonathan William. "Resonant cavity light emitting diodes." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399518.

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13

Hemingway, Leon Robert. "Dendrimers for light emitting diodes." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325840.

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14

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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15

Lau, Kwok Hing Connie. "Stacked organic light emitting diode." HKBU Institutional Repository, 2008. http://repository.hkbu.edu.hk/etd_ra/916.

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16

Guan, Nan. "Nitride nanowire light-emitting diode." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS372/document.

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Les nanofils nitrures présentent des propriétés optoélectroniques extraordinaires et sont considérés comme des matériaux prometteurs pour des diodes électroluminescentes (LEDs), grâce à leur haute qualité cristalline, leurs surfaces non-polaires, leur bonne flexibilité mécanique, leur rapport d’aspect élevé, etc.Cette thèse adresse la croissance, la fabrication, les caractérisations optiques et électriques et la simulation optique des dispositifs à base de nanofils nitrures, avec un accent particulier sur les LEDs à nanofils.Premièrement, cette thèse présente la croissance par épitaxie en phas

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17

Wang, Yan. "Highly flexible top-emitting phosphorescent organic light emitting diodes (OLEDs)." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/50921.

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Organic Light Emitting Diodes (OLEDs) have become attractive for flat panel display industry, with applications ranging from mobile phone screens to TVs. They have several advantages over inorganic LEDs such as high contrast ratio, wide viewing angle, faster response time, scalable large area processing and most importantly mechanical flexibility. OLEDs on flexible substrates can endure certain level of mechanical deformation such as bending, rolling or folding without disruption of the performance. The current demonstrated flexibility for OLEDs is up to a few centimeters or millimeters bendin

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18

Ferreira, Ricardo Xavier da Graça. "Gallium nitride light-emitting diode enabled visible light communications." Thesis, University of Strathclyde, 2017. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=28805.

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This thesis focuses on the development, measurement and application of novel micrometre-sized light emitting diodes (micro-LEDs) based on Gallium Nitride (GaN) for visible light communications (VLC) in both free-space and guided wave configurations. The goal is to set benchmarks for LED-based wireless optical communications. An overview of the field integrating research, industry and standards is presented. A top-down approach is taken with application requirements driving development of new micro-LEDs with simultaneously increased optical power and modulation bandwidth. This was achieved by m

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19

Fang, Fang. "Investigation of green light emitting diodes." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610094.

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20

譚祐怡 and Yau-yee Tam. "Dual use of visible light-emitting diodes." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31223436.

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Tam, Yau-yee. "Dual use of visible light-emitting diodes /." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21949001.

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22

Galata, Sotiria. "Sulphur doped silicon light emitting diodes." Thesis, University of Surrey, 2005. http://epubs.surrey.ac.uk/842933/.

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In this thesis light emission from sulphur related impurity in silicon has been reported. Although, sulphur related luminescence from silicon has been stated since the 1980's, no room temperature luminescence has been achieved and no compatible devices that can be integrated to the silicon technology have been invented. Photoluminescence and electroluminescence experiments were made on a set of samples implanted with only with sulphur at doses ranging from 1011-1014 S cm-2 at 30 keV, annealed at 1000 °C or 1100 °C for 10 s and on another set of samples implanted with sulphur as above a

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23

Siddiqui, Saiful Anam. "Erbium doped silicon light emitting diodes." Thesis, University of Surrey, 2003. http://epubs.surrey.ac.uk/843408/.

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Erbium, a rare earth element, has been shown to exhibit characteristic luminescence at 1.54mum due to its internal 4f transition from the first excited state (4pi3/2) to the ground state (4pi5/2). As this emission wavelength falls inside the maximum transmission window of silicon based optical fibers, erbium doped silicon might lead to the opportunity of silicon based optoelectronics. The introduction of erbium in silicon allows excitation through electron-hole recombination and subsequent radiative emission from the rare earth centers. The works reported here describe the structural, electric

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24

Taylor, Richard Martin. "Approaches to blue light emitting polymers." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343367.

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25

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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26

Liedtke, Alicia. "Liquid crystals for light emitting diodes." Thesis, University of Hull, 2009. http://hydra.hull.ac.uk/resources/hull:2429.

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In this work a series of new semiconducting liquid crystals (LCs), which are applicable for organic light emitting diodes (OLEDs), were investigated. Semiempirical calculations were carried out on monomers and anti-cofacial dimers built from our molecules, representing molecules in solution and thin film respectively. Compared to the monomer a doubling of the oscillator strength in the dimer was found for longitudinal offsets larger than 20 A. Smaller shifts showed a forbidden absorption transition from ground to the lowest excited state. Assuming that the absorption transition is equivalent t

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27

Visweswaran, Bhadri. "Encapsulation of organic light emitting diodes." Thesis, Princeton University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3665325.

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<p> Organic Light Emitting Diodes (OLEDs) are extremely attractive candidates for flexible display and lighting panels due to their high contrast ratio, light weight and flexible nature. However, the materials in an OLED get oxidized by extremely small quantities of atmospheric moisture and oxygen. To obtain a flexible OLED device, a flexible thin-film barrier encapsulation with low permeability for water is necessary. </p><p> Water permeates through a thin-film barrier by 4 modes: microcracks, contaminant particles, along interfaces, and through the bulk of the material. We have developed

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28

Weaver, Michael Stuart. "Electroluminescence from organic light emitting diodes." Thesis, University of Sheffield, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265610.

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29

Blades, Christopher David James. "Simulation of organic light emitting devices." Thesis, University of Bath, 2000. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760747.

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30

Gray, Dodd (Dodd J. ). "Thermal pumping of light-emitting diodes." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/76963.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 129-135).<br>The work presented here is a study of thermally enhanced injection in light-emitting diodes (LEDs). This effect, which we refer to as "thermal pumping", results from Peltier energy exchange from the lattice to charge carriers when current is injected into an LED. For an applied voltage V such that qV < (hw), where q is the electron charge and (hw) is the average emitted photon energy

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31

Lupton, John Mark. "Nanoengineering of organic light-emitting diodes." Thesis, Durham University, 2000. http://etheses.dur.ac.uk/1597/.

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32

Hood, Sean. "Light emitting diode color rendition properties." Kansas State University, 2013. http://hdl.handle.net/2097/15647.

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Master of Science<br>Department of Architectural Engineering and Construction Science<br>Fred Hasler<br>This paper discusses the color rendition capabilities of light emitting diodes (LEDs) and their relationship with the current standard for color rendition quality. The current standard for judging light source color rendering properties, known as the color rendering index (CRI), has come under heavy scrutiny in recent years with the introduction of LED in commercial lighting applications. LEDs, depending on construction type, have highly structured spectral distributions which do not scale w

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33

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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34

Dinh, Vincent Vinh. "Degradation in organic light emitting devices /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2003. http://uclibs.org/PID/11984.

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35

Squire, E. K. "Light emitting microstructures in porous silicon." Thesis, University of Bath, 1999. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285287.

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36

Huang, Qiang. "High efficiency top-emitting organic light-emitting diodes: design and fabrication." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2007. http://nbn-resolving.de/urn:nbn:de:swb:14-1193677683674-43826.

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This thesis focuses mainly on the techniques to achieve high-performance top-emitting OLEDs, regarding device efficiency and lifetime for both non-inverted and inverted structures. It is thus organized as follows: In Chapter 2, the basic physics of organic semiconductor materials are reviewed, including the electronic properties of organic semiconductor materials, molecular excitations and their electronic transitions etc., which are believed to be critical for understanding of the work. Then, the general device physics of OLEDs are reviewed in detail, which includes almost every important ele

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37

Chanyawadee, Soontorn. "Resonant energy transfer in light harvesting and light emitting applications." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/72508/.

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The performance of light emitting and light harvesting devices is improved by utilising resonant energy transfer. In lighting applications, the emission energy of a semiconductor heterostructure and the absorption of organic dyes or colloidal quantum dots (QDs) are engineered so that the excitations in the semiconductor heterostructure can be transferred to the light emitters by means of resonant energy transfer. The emitters subsequently emit colour-tunable light ranging from the visible to the near-infrared. As a result, a twofold enhancement of QD emission is demonstrated in a hybrid QD/sem

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38

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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39

CHANG, TUN-MIN, and 張敦岷. "Light-Extraction Enhancement of Light Emitting Diodes andOrganic Light Emitting Diodes by Photonic Crystal Structures." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/30191578760954676719.

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碩士<br>國立臺灣大學<br>光電工程學研究所<br>95<br>In this thesis, a flexible and efficient method to calculate light extraction efficiency of light-emitting device is developed. This method is primarily based on finite-difference time-domain ( FDTD) method aided with Fourier analysis to obtain the intensity of the target frequency. Energy through all angles or positions is summed up to evaluate total extraction efficiency. LEDs ( light emitting diodes) and OLEDs ( organic light emitting diodes) might become one of the primary components in displays and lighting. However, both suffer low light extraction effic

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40

胡峻瑋. "Synthesis of White-Light-Emitting Molecules for White Organic Light-Emitting Diodes." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/9f27q9.

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碩士<br>逢甲大學<br>化學工程學系<br>103<br>Two white-light-emitting small molecules, 1 and 2, were synthesized and fully characterized. Compounds 1 and 2 undergo an excited-stateintramolecular proton transfer (ESIPT) reaction, resulting in a tautomer that is in equilibrium with the normal species, exhibiting a dual emission that covers almost all of the visible spectrum and consequently generates white light. Moreover, the geometric structures and rontier molecular orbitals for 1 in the ground and the first singlet excited state were fully rationalized by density functional theory (DFT) and time-dependent

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41

Su, Po-Kun, and 蘇伯昆. "The Synthesis of Light-Emitting Copolymers and Fabrication of Light-Emitting Diodes." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/62324554798695243913.

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碩士<br>國立臺北科技大學<br>有機高分子研究所<br>90<br>We present synthesis and characterization of copolymers. In this study, copolymers of poly (2,3-diphenyl-5-hexyl-1,4-phenylenevinylene)(DP6-PPV) and poly [2-methoxy- 5-(2’ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) have been synthesized via a modified Gilch route involving the use of an acidic additive such as 4-tert-butylbenzyl chloride. As a result of this modified polymerization route, gelation can be minimized and the resulting copolymers were well soluble in common organic solvent, such as THF, toluene and chloroform etc. Blue-green to orange-red em

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42

Hsieh, Chun-Yu, and 謝濬宇. "Candle Light-Style Organic Light Emitting Diode." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/50845307637013042446.

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43

Lee, Kuen-da, and 李昆達. "Study of bicycle traffic lights with Light Emitting Diode." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/71754099906579035008.

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劉漢康. "Synthesis and Characterization of Light-Emitting Polymers and Applications in Organic Light-Emitting Diode." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/27894329868350761490.

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Gau, Huan-Jie, and 高煥捷. "Blue Phosphorescent Organic Light-Emitting Diode and Alternating Driven Current Organic Light-Emitting Diode." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/r2we9f.

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碩士<br>元智大學<br>光電工程學系<br>104<br>In this thesis, the first part is disclosed a series of novel host materials combining hole-transporting moiety, Carbazole, and electron-transporting moieties Triazole and Pyridine, as bipolar host to fabricate high efficiency blue phosphorescence organic light-emitting diode (OLED) with the blue phosphorescent emitting dopant, FIrpic. Second part is the development of an alternating current (AC)-driven organic light emitting diodes (OLED). We co-depositied these materials to modulate their energy level. We designed a symmetrical device structure, to achieve the

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46

Chen, Pin-cheng, and 陳品承. "Investigation of Surface Plasma Enhance Light Emitting Efficiency of Nano-silicon Light Emitting Device." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/88146896019770403461.

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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>In this thesis, we elucidated the development and basic theory of surface plasmon. In the experiment, we deposited the different thickness of silver nanoparticles on the nano-silicon light emitting devices to enhance light extraction efficiency by using localized surface plasmon resonance (LSPR). Silver nanoparticles arrayed layers were fabricated by e-gun and annealing processes. The size and geometry of particles can be controlled by the three conditions, such as a deposited film thickness, annealing temperature and time. These are important factors to d

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47

Pan, Shin-you, and 潘信友. "The study of top-emitting organic light-emitting diodes." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/30847092806231287032.

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碩士<br>義守大學<br>電子工程學系碩士班<br>93<br>Inverted top–emitting organic light emitting diodes (OLEDs) employing an aluminum coated glass substrate directly as a cathode and a semitransparent top Au thin film as an anode have been proposed. Light emits from the anode. The characteristics of Au thin film are very easily scraped by any external factor. This effect reduces the carrier injection ability. Therefore, aluminum is covered on the Au thin film to promote carrier injection and avoid being scraped. The maximum efficiency has been improved from 0.4cd/A up to 2.4cd/A. The interface between cathode an

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48

Lin, Ching-Liang, and 林京亮. "Light Enhancement of Thin-GaN Light Emitting Diodes." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/51951559488289706667.

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博士<br>國立中央大學<br>化學工程與材料工程研究所<br>96<br>GaN-based materials have leaped to a brand new stage in the past two decades. The single crystalline and direct band-gap GaN film can be grown on the sapphire substrate by metal-organic chemical vapor deposition (MOCVD). The wavelength of the emitting light from GaN ranges from ultra-violate (UV) to blue light region by doping various indium content. Nowadays, the material of the blue light emitting diodes is based on the GaN material. Pumping phosphors or other wavelength converter by blue light, the white light can be generated. Hence, the GaN mater

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49

Ho, Pei-Chen, and 賀培誠. "Light extraction analysis of light-emitting diodes array." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/94323868021292534601.

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碩士<br>元智大學<br>光電工程研究所<br>99<br>In this study, we build the optical model for GaN LED to study light extraction efficiency of LEDs based on the simulation with Monte Carlo ray tracing. According to this model, we change the LED-to-LED spacing of 3 × 3 LEDs array to analyze the light extraction efficiency with or without silicon. We analyze the light extraction efficiency for GaN LEDs array with different type of LED and LED-to-LED spacing. Finally, we compare the experiment with simulation results, and present the optimum enhancement of light extraction efficiency with different silicon shape p

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吳日中. "Organic Light-Emitting Diode Based Artificial Dusk-Light." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/31730494468755683827.

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