Effect of the charge balance on high-efficiency inverted polymer light-emitting diodes

被引：11

作者：

Huang, Qingyu ^{[1
,2
]}

Zhao, Suling ^{[1
]}

Guo, L. Jay ^{[2
]}

Xu, Zheng ^{[1
]}

Wang, Peng ^{[1
]}

Qin, Zilun ^{[1
]}

机构：

[1] Beijing Jiaotong Univ, Key Lab Luminescence & Opt Informat, Minist Educ, Beijing 100044, Peoples R China

[2] Univ Michigan, Dept Elect Engn & Comp Sci, Ann Arbor, MI 48105 USA

来源：

ORGANIC ELECTRONICS | 2017年 / 49卷

基金：

中国国家自然科学基金;

关键词：

Inverted polymer light emitting devices; Charge balance; Electron injection; Hole injection; ELECTRON-INJECTION; QUANTUM DOTS; LAYER; ELECTROLUMINESCENCE; PERFORMANCE; DEVICES;

D O I：

10.1016/j.orgel.2017.05.028

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work, an ultra-thin insulating layer, poly(methylmethacrylate) (PMMA), is incorporated between the emissive layer (EML) and hole transporting layer (HTL) within the inverted polymer light-emitting diodes (PLEDs). Such a structure helps to reduce the hole injection and balance the electrons and holes in the EML. PLEDs with optimal PMMA thickness of around 5.6 nm is observed to obtain a maximum current efficiency of 14.33 cd A(-1), which corresponds to 7.07% improvement compared to that of the device without PMMA layer (13.5 cd A(-1)). The device with best performance exhibits a superior low driving voltage of 2.5 V at 1 cd m(-2) and shows a lower efficiency roll-off current efficiency which sustains 85% of the maximum value when the current density reaches 140 mA cm(-2). (C) 2017 Published by Elsevier B.V.

引用

页码：123 / 128

页数：6

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