载流子平衡方法提高量子点发光二极管效率的研究  

Influence of Charge Carrier Balance on Efficiency of QD-LED

作　　者：杨媚 郑力为 孟琪 王鑫 梁培 袁晓霖 唐莹 Sergei I.Pavlov Pavel N.Brunkov 刘祖刚 YANG Mei;ZHENG Liwei;MENG Qi;WANG Xin;LIANG Pei;YUAN Xiaolin;TANG Ying;Sergei I.Pavlov;Pavel N.Brunkov;LIU Zugang(College of Optical and Electronic Technology,China Jiliang University,Hangzhou 310018,CHN;Ningbo Semiconductor International Corporation,Ningbo 315800,CHN;Ioffe Institute,26 Politekhnicheskaya,St Petersburg 194021,Rus)

机构地区：[1]中国计量大学光学与电子科技学院,杭州310018 [2]中芯集成电路(宁波)有限公司,浙江宁波315800 [3]Ioffe物理技术研究所,圣彼得堡194021

出　　处：《半导体光电》2020年第5期667-672,共6页Semiconductor Optoelectronics

基　　金：浙江省科技厅、宁波市科技局国际合作项目(2018D0007)。

摘　　要：尝试采用三种方式来平衡载流子的浓度,以提高量子点发光二极管(QLED)的外量子效率等性能:在正装结构(ITO/HIL/HTL/QD/ETL/EIL/金属阴极)的QLED的发光层和电子传输层中间插入超薄聚甲基丙烯酸甲脂(PMMA)电子阻挡层;在空穴注入和传输层方面,通过使用更加优化的HIL等来提高空穴注入和传输几率;在QD发光层方面,用短链配体来置换量子点的长链配体以增加载流子向量子点发光层中的传输效率等。在进行量子点配体交换的同时带来了量子点在正交溶剂中的可溶性优势,有利于QLED器件的全溶液法制备。Three approaches were performed to achieve the charge balance in normal structure QLEDs so as to improve their external quantum efficiency:by inserting an ultra-thin PMMA electronic barrier layer between the lighting emitting layer and electron transport layer of QLED with the structure of ITO/HIL/HTL/QD/ETL/EIL/metal cathode;by optimizing the hole injection layer in the hole side to improve the probability of hole injection and transport;replacing the long chain ligands of quantum dots with short chain ones to help the charge injection and transport into the emitting layer,so as to improve the device performance.Another benefit of the ligand exchange is the improved solubility of quantum dots in orthogonal solvents of charge transport layers,which is essential for full-solution processed QLEDs.

关 键 词：量子点发光二极管 电子阻挡层 空穴注入层 电荷平衡 

分 类 号：TN27[电子电信—物理电子学] TN312.8