Frontiers of Optoelectronics, 2013, 6 (4): 435, 网络出版: 2014-03-03  

A simple unilateral homogenous PhOLEDs with enhanced efficiency and reduced efficiency roll-off

A simple unilateral homogenous PhOLEDs with enhanced efficiency and reduced efficiency roll-off
作者单位
Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
摘要
Abstract
In this paper, highly efficient phosphorescent organic lighting emitting diodes (PhOELDs) with low efficiency roll-off are demonstrated by using a unilateral homogenous device structure with wide band-gap material 4, 4', 4″-tri(N-carbazolyl)-triphenylamine (TCTA) as hole transporting layer and emitting layer (EML). The optimized blue device exhibits a high power efficiency of 40 lm/W, external quantum efficiency of 19.2% and current efficiency of 37.7 cd/A. More importantly, the device exhibits a low efficiency roll-off at 1000 cd/m2. In addition, the white homogenous PhOLEDs only exhibits the efficiency roll-off 5.6% and 17.5%, corresponding to the brightness of 1000 and 5000 cd/m2 respectively. These interesting results demonstrate that the simple unilateral homogenous device structure is a promising way to enhance the device efficiency and reduce the efficiency roll-off.

Shaoqing ZHUANG, Wenzhi ZHANG, Xiao YANG, Lei WANG. A simple unilateral homogenous PhOLEDs with enhanced efficiency and reduced efficiency roll-off[J]. Frontiers of Optoelectronics, 2013, 6(4): 435. Shaoqing ZHUANG, Wenzhi ZHANG, Xiao YANG, Lei WANG. A simple unilateral homogenous PhOLEDs with enhanced efficiency and reduced efficiency roll-off[J]. Frontiers of Optoelectronics, 2013, 6(4): 435.

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