The investigation of carrier injection and transport mechanisms in organic light-emitting diodes
博士 === 國立臺灣大學 === 光電工程學研究所 === 106 === This dissertation is to investigate the carrier injection and transport mechanisms in organic light-emitting diodes, mainly associating with the hole injection layer and electron transport layer. There are four sections in this dissertation. First, we demonstra...
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ndltd-TW-106NTU051240652019-05-30T03:50:57Z http://ndltd.ncl.edu.tw/handle/72c5u3 The investigation of carrier injection and transport mechanisms in organic light-emitting diodes 有機發光二極體中載子的傳輸機制研究 Chia-Wei Liu 劉家偉 博士 國立臺灣大學 光電工程學研究所 106 This dissertation is to investigate the carrier injection and transport mechanisms in organic light-emitting diodes, mainly associating with the hole injection layer and electron transport layer. There are four sections in this dissertation. First, we demonstrate the use of self-assembly to fabricate solution-processed molybdenum oxide films by simply casting a metal oxide solution onto an indium tin oxide substrate. The devices with self-assembled hole injection layers exhibited nearly double the efficiency of one made with commonly used evaporated molybdenum oxide hole injection layers. Second, we demonstrate the use of solution-processed molybdenum trioxide nanoparticle-decorated molybdenum disulfide (MoS2) nanosheets (MoS2/MoO3) as hole injection layer in organic lighting diodes. The device performance is shown to be significantly improved by the introduction of such MoS2/MoO3 hole injection layer without any post-ultraviolet-ozone treatment, and is shown to better the performance of devices fabricated using conventional. Third, The influence of the electron-transport layer on an Ir(ppy)3-based phosphorescent light-emitting diode was investigated. We found that although devices with pyridine-containing ETLs, bis-1,2-(3,5-di-3-pyridyl-phenyl)benzene (B3PyPb) and 1,3,5-tri(m-pyrid-3-ylphenyl)benzene (TmPyPb), achieved very high efficiencies, their lifetimes were worse than other commonly used ETLs. However, the device lifetime can be increased by utilizing a high-stability electron-blocking layer to avoid triplet-polaron annihilation by separating the excitons in the emitting layer and the polarons in the electron transport layer. Fourth, we will discuss a series of standard organic light-emitting diode with various hole-injection layers in order to identify the origin of luminance degradation and the role played by hole injection layers in device lifetime. Band alignment results in the formation of a well-formed charge transfer interface capable of preventing the accumulation of charge at the indium tin oxide/hole transport layer interface. Keywords: Light-emitting diodes, MoO3, MoS2, Hole injection layer, Electron transport layer, Device lifetime. Chih-I Wu 吳志毅 2018 學位論文 ; thesis 96 en_US |
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博士 === 國立臺灣大學 === 光電工程學研究所 === 106 === This dissertation is to investigate the carrier injection and transport mechanisms in organic light-emitting diodes, mainly associating with the hole injection layer and electron transport layer. There are four sections in this dissertation. First, we demonstrate the use of self-assembly to fabricate solution-processed molybdenum oxide films by simply casting a metal oxide solution onto an indium tin oxide substrate. The devices with self-assembled hole injection layers exhibited nearly double the efficiency of one made with commonly used evaporated molybdenum oxide hole injection layers. Second, we demonstrate the use of solution-processed molybdenum trioxide nanoparticle-decorated molybdenum disulfide (MoS2) nanosheets (MoS2/MoO3) as hole injection layer in organic lighting diodes. The device performance is shown to be significantly improved by the introduction of such MoS2/MoO3 hole injection layer without any post-ultraviolet-ozone treatment, and is shown to better the performance of devices fabricated using conventional. Third, The influence of the electron-transport layer on an Ir(ppy)3-based phosphorescent light-emitting diode was investigated. We found that although devices with pyridine-containing ETLs, bis-1,2-(3,5-di-3-pyridyl-phenyl)benzene (B3PyPb) and 1,3,5-tri(m-pyrid-3-ylphenyl)benzene (TmPyPb), achieved very high efficiencies, their lifetimes were worse than other commonly used ETLs. However, the device lifetime can be increased by utilizing a high-stability electron-blocking layer to avoid triplet-polaron annihilation by separating the excitons in the emitting layer and the polarons in the electron transport layer. Fourth, we will discuss a series of standard organic light-emitting diode with various hole-injection layers in order to identify the origin of luminance degradation and the role played by hole injection layers in device lifetime. Band alignment results in the formation of a well-formed charge transfer interface capable of preventing the accumulation of charge at the indium tin oxide/hole transport layer interface. Keywords: Light-emitting diodes, MoO3, MoS2, Hole injection layer, Electron transport layer, Device lifetime.
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author2 |
Chih-I Wu |
author_facet |
Chih-I Wu Chia-Wei Liu 劉家偉 |
author |
Chia-Wei Liu 劉家偉 |
spellingShingle |
Chia-Wei Liu 劉家偉 The investigation of carrier injection and transport mechanisms in organic light-emitting diodes |
author_sort |
Chia-Wei Liu |
title |
The investigation of carrier injection and transport mechanisms in organic light-emitting diodes |
title_short |
The investigation of carrier injection and transport mechanisms in organic light-emitting diodes |
title_full |
The investigation of carrier injection and transport mechanisms in organic light-emitting diodes |
title_fullStr |
The investigation of carrier injection and transport mechanisms in organic light-emitting diodes |
title_full_unstemmed |
The investigation of carrier injection and transport mechanisms in organic light-emitting diodes |
title_sort |
investigation of carrier injection and transport mechanisms in organic light-emitting diodes |
publishDate |
2018 |
url |
http://ndltd.ncl.edu.tw/handle/72c5u3 |
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