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| 基于MADN空穴传输层的双层结构高效率黄绿光OLED及其阻抗谱分析 | |
| 引用本文： | 张小文,莫炳杰,刘黎明,王红航,陈二伟,许积文,王 华,魏 斌. 基于MADN空穴传输层的双层结构高效率黄绿光OLED及其阻抗谱分析[J]. 光谱学与光谱分析, 2015, 35(12): 3296-3299. DOI: 10.3964/j.issn.1000-0593(2015)12-3296-04 |
| 作者姓名： | 张小文 莫炳杰 刘黎明 王红航 陈二伟 许积文 王 华 魏 斌 |
| 作者单位： | 1. 桂林电子科技大学, 广西信息材料重点实验室, 广西 桂林 541004 2. 电子科技大学中山学院, 电子薄膜与集成器件国家重点实验室中山分室, 广东 中山 528402 3. 上海大学, 新型显示技术及应用集成教育部重点实验室, 上海 200072 |
| 摘 要： | 以MADN为空穴传输层，主-客掺杂体系[Alq3∶0.7 Wt%rubrene]为发光兼电子传输层，构建了双层结构的高效率黄绿光OLED器件。该器件的黄绿光由主发光体Alq3通过不完全能量转移到客发光体rubrene实现，电致发光峰值位于560 nm，1931CIE色坐标为(0.46, 0.52)，最大发光效率达到了7.63 cd·A-1，比相应的NPB做空穴传输层的双层结构器件提高了30%。通过构建以MADN或NPB为空穴传输层的空穴单载流子器件并进行阻抗谱分析，结果表明MADN可以作为一种非常有效的空穴传输层，其空穴迁移性略低于NPB，这恰好弥补了OLED器件中空穴迁移比电子迁移快这一缺陷，为改善OLED发光层中载流子的平衡性创造了条件，从而提高了器件的发光效率。此外，MADN做空穴传输层的双层结构OLED的发光效率与传统三层结构器件(MADN和Alq3分别作为空穴传输层和电子传输层)基本相当，表明了这种双层结构器件在简化器件结构的同时并不以牺牲发光效率为代价，发光层[Alq3∶0.7 Wt%rubrene]兼具有优良的电子传输性能。 |
| 关 键 词： | OLED 阻抗谱 空穴传输 |
| 收稿时间： | 2014-07-08 |
Highly Efficient Bilayer-Structure Yellow-Green OLED with MADN Hole-Transport Layer and the Impedance Spectroscopy Analysis |
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| ZHANG Xiao-wen,MO Bing-jie,LIU Li-ming,WANG Hong-hang,CHEN Er-wei,XU Ji-wen,WANG Hua,WEI Bin. Highly Efficient Bilayer-Structure Yellow-Green OLED with MADN Hole-Transport Layer and the Impedance Spectroscopy Analysis[J]. Spectroscopy and Spectral Analysis, 2015, 35(12): 3296-3299. DOI: 10.3964/j.issn.1000-0593(2015)12-3296-04 | |
| Authors: | ZHANG Xiao-wen MO Bing-jie LIU Li-ming WANG Hong-hang CHEN Er-wei XU Ji-wen WANG Hua WEI Bin |
| Affiliation: | 1. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China2. Zhongshan Branch of State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, China3. Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai 200072, China |
| Abstract: | Highly efficient bilayer-structure yellow-green organic light-emitting device (OLED) has been demonstrated based on MADN as hole-transport layer (HTL) and host-guest coped system of [Alq3∶0.7 Wt%rubrene] as emitting and electron-transport layer. The device gives yellow-green emission through incomplete energy transfer from the host of Alq3 to the guest of rubrene. An electroluminescent peak of 560 nm, 1931 CIE color coordinates of (0.46, 0.52) and a maximum current efficiency of 7.63 cd·A-1 (which has been enhanced by 30% in comparison with the counterpart having conventional NPB HTL) are observed. The hole-transporting characteristics of MADN and NPB have been systematically investigated by constructing hole-only devices and employing impedance spectroscopy analysis. Our results indicate that MADN can be served as an effective hole-transport material and its hole-transporting ability is slightly inferior to NPB. This overcomes the shortcoming of hole transporting more quickly than electron in OLED and improves carrier balance in the emitting layer. Consequently, the device current efficiency is promoted. In addition, the current efficiency of bilayer-structure OLED with MADN as HTL is comparable to that of conventinol trilayer-structure device with MADN as HTL and Alq3 as electron-transport layer. This indicates that the simplified bilayer-structure device can be achieved without sacrificing current efficiency. The emitting layer of [Alq3∶0.7 Wt%rubrene] possesses superior elecron-transporting ability. |
| Keywords: | OLED Impedance spectroscopy Hole transporting |
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