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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 吳志毅(Chih-I Wu) | |
| dc.contributor.author | Shiau-Han Su | en |
| dc.contributor.author | 蘇筱涵 | zh_TW |
| dc.date.accessioned | 2021-06-14T16:42:26Z | - |
| dc.date.available | 2008-08-14 | |
| dc.date.copyright | 2008-08-14 | |
| dc.date.issued | 2008 | |
| dc.date.submitted | 2008-07-31 | |
| dc.identifier.citation | Reference
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/40193 | - |
| dc.description.abstract | 本論文著重探討有機發光二極體（OLEDs）中載子傳輸的特性研究。我們藉由改變元件尺寸和外加電壓來觀察對應的暫態電激發光現象（Transient electroluminescence）。因為電容效應，元件尺寸會影響暫態電激發光結果。為了簡化問題，我們採用簡化過的式子來近似整體電激發光延遲時間（EL delay time），將延遲時間分為載子注入和載子傳輸時間。根據這個式子，我們推算出Alq3中的電子移動率，並且發現載子注入時間在整體延遲時間中佔有很大比例，同時元件尺寸也和延遲時間息息相關。 | zh_TW |
| dc.description.abstract | This thesis focuses on the transient electroluminescence (TREL) behavior of carriers transport in organic light emitting diodes (OLEDs) by varying the device size and observing the corresponding voltage and current magnitude evolution. The EL response is fundamentally governed by the device area, i.e., the capacitance of the device. For the sake of simplicity in the EL delay time, we use an approximate model by assuming Eth << E0 and ttrans << RC to describe it. The model divides the delay time into two parts, the charge injection delay and the charge transport delay. According to the formulation, we estimate electron mobility in Alq3 under fast-pulse excitation. In this study, we conclude that the charge injection process greatly contributes to EL delay, and the delay time correlates closely with the device area. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-14T16:42:26Z (GMT). No. of bitstreams: 1 ntu-97-R95941025-1.pdf: 595242 bytes, checksum: 78d649810a7efdbdd7bf2f1d8d8f2ede (MD5) Previous issue date: 2008 | en |
| dc.description.tableofcontents | Contents
1 Introduction…………………………………………………………1 1.1 Historical overview of OLED……………………………………1 1.2 Basic concepts of electroluminescence in organic solids……………………………………………………………………3 2 Devices, experimental methods, and materials………………7 2.1 Devices: ITO/ NPB/ Alq3/ Alq3:Cs2CO3/ Cs2CO3/ Al………7 2.2 Experimental methods……………………………………………8 2.2.1 Sample preparation……………………………………………8 2.2.2 Thermal evaporation…………………………………………10 2.2.3 Transient electroluminescence method……………………12 2.3 Materials…………………………………………………………14 2.3.1 Organic: NPB and Alq3………………………………………14 2.3.2 Cs2CO3…………………………………………………………15 2.3.3 Aluminum………………………………………………………16 3 Experimental result and discussion……………………………18 3.1 Typical assumption: charge carrier mobility in Alq3…18 3.2 Formulation of EL delay time…………………………………19 3.3 Device characteristics………………………………………22 3.3.1 Device uses Cs2CO3 as EIL versus one without EIL…22 3.3.2 Four different Cs2CO3 concentrations in Alq3…………22 3.4 Transient EL behavior of OLEDs on ITO/NPB/Alq3/Cs2CO3/Al structure…………………………………24 3.4.1 Experimental results and discussions……………………24 3.4.2 Conclusion………………………………………………………26 4 Conclusions and future work……………………………………40 Reference………………………………………………………………41 List of Figures 1.1 Evolution of LED/ OLED performance…………………………2 1.2 OLED Basic stricture……………………………………………3 1.3 EL process in OLEDs………………………………………………4 2.1 Patterns of ITO, organic and aluminum………………………9 2.2 The situation of sample holder and mask holder during evaporation……………………………………………………………10 2.3 A device emits light at a certain applied voltage……12 2.4 TREL experimental setup………………………………………14 2.5 NPB and Alq3 molecular structures…………………………15 2.6 Tungsten wired Al2O3 crucible………………………………16 3.1 I-V characteristics of two devices…………………………29 3.2 Semilog I-V characteristics of two devices………………29 3.3 J-V characteristics of device with different concentration of Cs2CO3……………………………………………30 3.4 Semilog J-V characteristics…………………………………30 3.5 Delayed EL at different Cs2CO3 concentration after applying a 20V pulse…………………………………………………31 3.6 Td-A characteristics of devices with different concentration…………………………………………………………31 3.7 EL delay time with different device sizes after applying a 25V pulse…………………………………………………32 3.8 EL delay time of 6 mm2 device under different applied voltage…………………………………………………………………32 3.9 The dependence of delay time on the device area with ITO/NPB/Alq3/Cs2CO3 at different applied voltages…………………………………………………………………33 3.10 Td obtained from measurement………………………………33 3.11 Linear Fitting of Td-A curve with applying 10V, 12V, 15V and 20V……………………………………………………………34 3.12 Linear Fitting of Td-A curve with applying 25V, 30V, 35V and 40V……………………………………………………………35 3.13 Calculated vs. E1/2…………………………………………36 3.14 Td vs. Tinj vs. Ttrans for the device area of 6 mm2 and 9 mm2………………………………………………………………37 3.15 Td vs. Tinj vs. Ttrans for the device area of 16 mm2 and 30 mm2………………………………………………………………38 List of Tables 3.1 Slope, y intercept of the linear fitting and the calculated electron mobility in Alq3………………………………………………………………………28 3.2 Td, Tinj and Ttrans with device size of 6 mm2 and 9 mm2 applied in different voltage…………………………………………………………………28 3.3 Td, Tinj and Ttrans with device size of 6 mm2 and 9 mm2 applied in different voltage…………………………………………………………………28 3.4 Time constant calculated with different device area…39 3.5 Tinj calculated by two methods………………………………39 | |
| dc.language.iso | en | |
| dc.subject | 跳躍式理論 | zh_TW |
| dc.subject | 熱蒸鍍 | zh_TW |
| dc.subject | 有機發光二極體 | zh_TW |
| dc.subject | 電激發光 | zh_TW |
| dc.subject | 載子移動率 | zh_TW |
| dc.subject | 載子傳輸 | zh_TW |
| dc.subject | 載子注入 | zh_TW |
| dc.subject | Hopping | en |
| dc.subject | Charge carrier injection | en |
| dc.subject | Charge carrier transport | en |
| dc.subject | Charge carrier mobility | en |
| dc.subject | Transient electroluminescence | en |
| dc.subject | Organic light emitting diodes | en |
| dc.subject | Thermal evaporation | en |
| dc.title | 有機發光二極體暫態電激發光現象 | zh_TW |
| dc.title | Transient Electroluminescence Behavior of Organic Light-emitting Devices | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 96-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 陳奕君(I-Chun Cheng),李君浩(Jiun-haw Lee) | |
| dc.subject.keyword | 熱蒸鍍,有機發光二極體,電激發光,載子移動率,載子傳輸,載子注入,跳躍式理論, | zh_TW |
| dc.subject.keyword | Thermal evaporation,Organic light emitting diodes,Transient electroluminescence,Charge carrier mobility,Charge carrier transport,Charge carrier injection,Hopping, | en |
| dc.relation.page | 43 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2008-08-01 | |
| dc.contributor.author-college | 電機資訊學院 | zh_TW |
| dc.contributor.author-dept | 光電工程學研究所 | zh_TW |
| 顯示於系所單位： | 光電工程學研究所 | |
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