naa a22 4500 510729452 CHVBK 20180411082947.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1007/s12200-013-0349-3 doi (NATIONALLICENCE)springer-10.1007/s12200-013-0349-3 A simple unilateral homogenous PhOLEDs with enhanced efficiency and reduced efficiency roll-off [Elektronische Daten] [Shaoqing Zhuang, Wenzhi Zhang, Xiao Yang, Lei Wang] 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. Higher Education Press and Springer-Verlag Berlin Heidelberg, 2013 enhance efficiency nationallicence efficiency roll-off nationallicence unilateral homogenous structures nationallicence Zhuang Shaoqing Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074, Wuhan, China aut Zhang Wenzhi Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074, Wuhan, China aut Yang Xiao Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074, Wuhan, China aut Wang Lei Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074, Wuhan, China aut Frontiers of Optoelectronics Springer Berlin Heidelberg 6/4(2013-12-01), 435-439 2095-2759 6:4<435 2013 6 12200 https://doi.org/10.1007/s12200-013-0349-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12200-013-0349-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhuang Shaoqing Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074, Wuhan, China aut NATIONALLICENCE 700 1- Zhang Wenzhi Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074, Wuhan, China aut NATIONALLICENCE 700 1- Yang Xiao Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074, Wuhan, China aut NATIONALLICENCE 700 1- Wang Lei Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074, Wuhan, China aut NATIONALLICENCE 773 0- Frontiers of Optoelectronics Springer Berlin Heidelberg 6/4(2013-12-01), 435-439 2095-2759 6:4<435 2013 6 12200 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer