题目：

Simplified Hybrid White Organic Light-Emitting Diodes with a Mixed Fluorescent Blue Emitting Layer for Exciton Managing and Lifetime Improving

作者：

Yuan Liu, Feng Liang, Lin-Song Cui, Xiao-Bo Shi, Zhao-Kui Wang,* Liang-Sheng Liao*

单位：

Jiangsu Key Laboratory for Carbon-Based Functional Materials &   Devices, Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Suzhou, Jiangsu 215123, China

摘要：

The authors demonstrate a simple but effective way to manage exciton, reduce the efficiency roll-off, enhance the color stability and improve the lifetime of hybrid white organic light-emitting diodes (WOLEDs) simultaneously. Red and green phosphorescent emitting layers (EMLs) are connected by a mixed fluorescent blue emitting layer (MBL), which is composed of two self-host fluorescent materials of N,N'-di-1-naphthalenyl-N,N'-diphenyl-[1,1':4',1'':4'',1'''-quaterphenyl]-4,4'''-diamine (4P-NPD) and bis[2-(2-hydroxyphenyl)-pyridine]beryllium (Bepp₂). By adjusting the mixture ratio and the thickness of MBL, the intensity of blue and green emissions can be tuned independently. A maximum power efficiency of 41.1 lm W^-1 and external quantum efficiency (EQE) of 15.8% is obtained without any out-coupling schemes or doping strategies. In addition, the device shows a stable electroluminescence spectrum with Commission International de L’Eclairage (CIE) coordinates of (0.47, 0.43) in the practical range of 1000-5000 cd m^-2. Furthermore, the fuzzy interfaces between MBL and phosphorescent EMLs, and the wide distribution of charges and excitons, result in four times prolonged device lifetime.

影响因子：

5.359

分区情况：

一区

链接：

http://onlinelibrary.wiley.com/wol1/doi/10.1002/adom.201600410/full