High Efficiency Non-Doped White Organic Light Emitting Diodes Based on a Bilayer Interface-Exciplex Structure

被引：12

作者：

Wang, Han ^{[1
]}

Dong, Dan ^{[1
]}

Lian, Lu ^{[1
]}

Zhu, Feng ^{[1
]}

Xu, Dingyan ^{[1
]}

Wu, Siyao ^{[1
]}

He, Gufeng ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Dept Elect Engn, Natl Engn Lab TFT LCD Mat & Technol, Shanghai 200240, Peoples R China

来源：

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE | 2019年 / 216卷 / 11期

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

bilayer structure; interface-exciplex; PHOLED; ultrathin non-doped emitting layers; WOLED; EXTERNAL QUANTUM EFFICIENCY; EMISSIVE LAYERS; BLUE; MONOCHROME; MANAGEMENT; GREEN;

D O I：

10.1002/pssa.201900034

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High efficiency non-doped blue and white organic light emitting diodes (OLEDs) are realized by using a bilayer interface-exciplex (i-Exc) structure. Since the neutral exciplex are formed at the interface, the interface charge accumulation is reduced, thereby suppressing exciton quenching in the device. With the i-Exc structure, a maximum external quantum efficiency (EQE) of 23.1% is achieved in the non-doped blue phosphorescent OLED. Moreover, the white emission can be obtained by inserting an ultrathin orange-red phosphorescent emitter into the blue devices. The charge trapping in the orange-red emitter can be suppressed by adjusting the position of the ultrathin orange-red emitting layer in the device, contributing to superior spectral stability. The WOLED achieves an EQE of 20.0% and exhibits a stable warm white emission. The Commission Internationale de l'Eclairage (CIE) coordinates of WOLED are (0.41, 0.40) at 5V and slightly change to (0.40, 0.41) at 9V.

引用

页数：7

共 30 条

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