Tesis sobre el tema "EMITTING DIODES"
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Stevenson, Stuart G. "Dendrimer light-emitting diodes". Thesis, St Andrews, 2008. http://hdl.handle.net/10023/581.
Texto completoChoi, Wai Kit. "Organic light-emitting diodes". HKBU Institutional Repository, 1999. http://repository.hkbu.edu.hk/etd_ra/190.
Texto completoRosenow, 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.
Texto completoThomschke, 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.
Texto completoGray, Jonathan William. "Resonant cavity light emitting diodes". Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399518.
Texto completoHemingway, Leon Robert. "Dendrimers for light emitting diodes". Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325840.
Texto completoLiu, Yee-Chen. "Polymer blend light-emitting diodes". Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610709.
Texto completoChen, 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.
Texto completoNajafabadi, Ehsan. "Stacked inverted top-emitting white organic light-emitting diodes". Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52990.
Texto completoFang, Fang. "Investigation of green light emitting diodes". Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610094.
Texto completoWang, Yan. "Highly flexible top-emitting phosphorescent organic light emitting diodes (OLEDs)". Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/50921.
Texto completoApplied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate
Galata, Sotiria. "Sulphur doped silicon light emitting diodes". Thesis, University of Surrey, 2005. http://epubs.surrey.ac.uk/842933/.
Texto completoSiddiqui, Saiful Anam. "Erbium doped silicon light emitting diodes". Thesis, University of Surrey, 2003. http://epubs.surrey.ac.uk/843408/.
Texto completoWebster, Graham R. "Advanced polymers for light emitting diodes". Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393551.
Texto completoLiedtke, Alicia. "Liquid crystals for light emitting diodes". Thesis, University of Hull, 2009. http://hydra.hull.ac.uk/resources/hull:2429.
Texto completoFarrow, T. "Quantum dot single-photon emitting diodes". Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598951.
Texto completoVisweswaran, Bhadri. "Encapsulation of organic light emitting diodes". Thesis, Princeton University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3665325.
Texto completoOrganic 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.
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 a flexible barrier film made by Plasma Enhanced Chemical Vapor Deposition (PECVD) that is devoid of any microcracks. In this work we have systematically reduced the permeation from the other three modes to come up with a barrier film design for an operating lifetime of over 10 years.
To provide quantitative feedback during barrier material development, techniques for measuring low diffusion coefficient and solubility of water in a barrier material have been developed. The mechanism of water diffusion in the barrier has been identified. From the measurements, we have created a model for predicting the operating lifetime from accelerated tests when the lifetime is limited by bulk diffusion.
To prevent the particle induced water permeation, we have encapsulated artificial particles and have studied their cross section. A three layer thin-film that can coat a particle at thicknesses smaller than the particle diameter is identified. It is demonstrated to protect a bottom emission OLED device that was contaminated with standard sized glass beads.
The photoresist and the organic layers below the barrier film causes sideways permeation that can reduce the lifetime set by permeation through the bulk of the barrier. To prevent the sideways permeation, an impermeable inorganic grid made of the same barrier material is designed. The reduction in sideways permeation due to the impermeable inorganic grid is demonstrated in an encapsulated OLED.
In this work, we have dealt with three permeation mechanisms and shown solution to each of them. These steps give us reliable flexible encapsulation that has a lifetime of greater than 10 years.
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.
Texto completoGray, Dodd (Dodd J. ). "Thermal pumping of light-emitting diodes". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/76963.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (p. 129-135).
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, thermal pumping can greatly enhance the wall plug efficiency of an LED. Thermal pumping can even give rise to LED wall plug efficiency greater than one, which corresponds to electroluminescent cooling of the diode lattice. Thermal pumping and electroluminescent cooling will be studied through numerical modeling and experiment. Our results include the first ever experimental demonstration of electroluminescent cooling in an LED. Finally we use the intuition gained from the study of thermal pumping to design an LED for maximized optical power output with 100% wall plug efficiency.
by Dodd Gray.
M.Eng.
Lupton, John Mark. "Nanoengineering of organic light-emitting diodes". Thesis, Durham University, 2000. http://etheses.dur.ac.uk/1597/.
Texto completoFehrman, Stephen A. "Passivation of polymer light-emitting diodes". Click here to view, 2009. http://digitalcommons.calpoly.edu/eesp/19/.
Texto completoProject advisor: David Braun. Title from PDF title page; viewed on Jan. 28, 2010. Includes bibliographical references. Also available on microfiche.
譚祐怡 y 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.
Texto completoTam, 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.
Texto completoZou, Zhengzhong. "GaAs-based quantum dot vertical-cavity surface-emitting lasers and microactivity light emitting diodes /". Full text (PDF) from UMI/Dissertation Abstracts International, 2002. http://wwwlib.umi.com/cr/utexas/fullcit?p3089497.
Texto completoHuang, 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.
Texto completoLi, Zonglin y 李宗林. "Reliability study of InGaN/GaN light-emitting diode". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B43224155.
Texto completoLi, Zonglin. "Reliability study of InGaN/GaN light-emitting diode". Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B43224155.
Texto completoLu, 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.
Texto completoYu, Xiaoming. "Organic light emitting diodes (OLEDs) for lighting /". View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?ECED%202009%20YU.
Texto completoPotfajova, Jaroslava. "Silicon based microcavity enhanced light emitting diodes". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-25451.
Texto completoPotfajova, J. "Silicon based microcavity enhanced light emitting diodes". Forschungszentrum Dresden-Rossendorf, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-27756.
Texto completoHabtemichael, Yishak Tekleab. "Packaging designs for ultraviolet light emitting diodes". Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45764.
Texto completoMitchell, 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.
Texto completoMirza, Benjamin Imran. "Mid-infrared INSb/A1InSb light-emitting diodes". Thesis, University of Bristol, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.503928.
Texto completoEvans, 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.
Texto completoHo, 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.
Texto completoHui, Kwun-nam y 許冠南. "Light-emitting diodes incorporating microdisks and microspheres". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B41633969.
Texto completoNg, Man-ching Alan y 吳文政. "Light emitting diodes based on ZnO nanorods". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B43572005.
Texto completoSchober, Matthias. "Charge Transport in Organic Light-Emitting Diodes". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-100071.
Texto completoSmith, Lucy Hannah. "Optical optimisation of organic light-emitting diodes". Thesis, University of Exeter, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.425499.
Texto completoLai, May Ling. "Perovskite light-emitting diodes with tunable emission". Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/283638.
Texto completoSanthanam, Parthiban. "Thermo-electrically pumped semiconductor light emitting diodes". Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/87935.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (pages 217-227).
Thermo-electric heat exchange in semiconductor light emitting diodes (LEDs) allows these devices to emit optical power in excess of the electrical power used to drive them, with the remaining power drawn from ambient heat. In the language of semiclassical electron transport, the electrons and holes within the device absorb lattice phonons as they diffuse from their respective contacts into the LED's active region. There they undergo bimolecular radiative recombination and release energy in the form of photons. In essence the LED is acting as a thermodynamic heat pump operating between the cold reservoir of the lattice and the hot reservoir of the outgoing photon field. In this thesis we report the first known experimental evidence of an LED behaving as a heat pump. Heat pumping behavior is observed in mid-infrared LEDs at sub-thermal forward bias voltages, where electrical-to-optical power conversion at arbitrarily high efficiency is possible in the limit of low optical output power. In this regime, the basic thermal physics of an LED differs from that seen at conventional higher voltage operating points. We construct a theoretical model for entropy transport in an LED heat pump and examine its consequences both theoretically and experimentally. We use these results to propose a new design for an LED capable of very high efficiency power conversion at power densities closer to the limit imposed by the Second Law of Thermodynamics. We then explore the potential application of these thermo-photonic heat pumps as extremely efficient sources for low-power communication and high-temperature absorption spectroscopy.
by Parthiban Santhanam.
Ph. D.
Rosser, Saul 1979. "Underwater photographic lighting using Light Emitting Diodes". Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/91794.
Texto completoSharma, Nikhil. "Characterisation of InGaN/GaN light emitting diodes". Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621315.
Texto completoPotfajova, J. "Silicon based microcavity enhanced light emitting diodes". Forschungszentrum Dresden-Rossendorf, 2009. https://hzdr.qucosa.de/id/qucosa%3A21604.
Texto completoFernandes, Ricardo Liz de Castilho. "Green emitting diodes for solid state lighting". Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/17763.
Texto completoNos anos recentes a iluminação de estado sólido impulsionou alternativas de iluminação efí cientes e ecológicas. Os desafi os correntes envolvem o desenvolvimento de materiais emissores de luz que convertem radiação de uma determinada energia para radiação de energia mais baixa, na gama do visível. Esta tese estuda um complexo novo, Tb(NaI)3(H2O)2 onde NaI é o ácido nalidíxico, que emite na região do verde e é estável sob iluminação no ultravioleta. Este foi incorporado em materiais híbridos orgânico-inorgânico tripodais com dois pesos moleculares médios (3000 e 5000 g.mol-1, denominados t- U(3000) e t-U(5000) respetivamente) que permitem o processamento de monólitos e fi lmes com forma e espessura controlada. Estes híbridos também aumentam o rendimento quântico absoluto de emissão de 0.11 medidos para o Tb(NaI)3(H2O)2 isolado para ~0.82 após incorporação no t-U(5000). Foi também demonstrado o potencial de usar estes materiais híbridos como emissores na região verde para uso em iluminação de estado sólido através do revestimento do díodo emissor na região ultravioleta (365 nm). Este LED apresenta uma efi cácia de 1.3 lm.W1.
In the last few years, solid state light-emitting diodes (LEDs) have been driving the lighting industry towards energy e cient and environmental friendly lighting. Current challenges encompass e cient and low-cost downconverting photoluminescent phosphors with emission in the visible region. This thesis will cover a novel UV-photostable green emitting complex, Tb(NaI)3(H2O)2 where NaI is nalidixic acid, was incorporated into organic-inorganic tripodal hybrid materials with two average molecular weights (3000 and 5000 g.mol{1, termed as t- U(5000) and t-U(3000), respectively) which enable the easy shaping of monoliths and lms with controlled thickness. Moreover, the hybrid hosts boost the Tb3+ green absolute emission quantum yield from 0.11 measured for the isolated Tb(NaI)3(H2O)2 complex to 0.82 after incorporation into t-U(5000). The potential use of the hybrid materials as UV-down converting green-emitting phosphors for solid state lighting was demonstrated by means of coating a near-UV LED (365 nm). This LED shows an e cacy of 1.3 lm.W1.
Hui, Kwun-nam. "Light-emitting diodes incorporating microdisks and microspheres". Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B41633969.
Texto completoNg, Man-ching Alan. "Light emitting diodes based on ZnO nanorods". Click to view the E-thesis via HKUTO, 2010. http://sunzi.lib.hku.hk/hkuto/record/B43572005.
Texto completoShaheen, Sean E. "Device physics of organic light-emitting diodes". Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/289012.
Texto completoCHEN, FANG. "Halide perovskite nanocrystal-based light emitting diodes". Doctoral thesis, Università degli studi di Genova, 2021. http://hdl.handle.net/11567/1041035.
Texto completo