Efficient Green Organic Light-Emitting Devices Based on a Solution-Processable Starburst Molecule
ZHANG Xin-Wen1** , WANG Jian-Yun1 , ZHAO Ling-Ling1 , GUO Xin1 , LAI Wen-Yong1** , HUANG Wei1,2
1 Key Laboratory for Organic Electronics & Information Displays, Institute of Advanced Materials, Nanjing University of Posts and Telecommunications, Nanjing 2100232 Institute of Advanced Materials, Nanjing University of Technology, Nanjing 211816
Abstract ：We develop high efficiency solution-processed pure green organic light-emitting devices using a starburst molecule 7,7',7"-(5,5,10,10,15,15-hexahexyl-10, 15-dihydro-5H-diindeno[1, 2-a:1', 2'-c]fluorene-2,7,12-triyl)tris(4-(4-(9H-carbazol-9-yl)phenyl)benzo[c][1,2,5]thiadiazole) (TRcz) doped 2-methyl-9,10-di(2-naphthyl)anthracene (MADN) as the emitting layers. The electroluminescence properties of the devices with different doping concentrations are investigated. With the increasing doping concentration from 0.5wt% to 5wt%, the maximum efficiency changes from 4.8 cd/A to 8.4 cd/A. Under the optimal concentration of 4wt%, the device shows pure green emission at 516 nm with a chromaticity coordinate of (0.30, 0.59) as well as a high brightness of 19900 cd/m2 and a high efficiency of 10.1 cd/A, which are better than 11490 cd/m2 and 4.2 cd/A obtained in the undoped device.
收稿日期: 2013-06-05
出版日期: 2013-11-21
:
85.60.Jb
(Light-emitting devices)
78.60.Fi
(Electroluminescence)
78.55.-m
(Photoluminescence, properties and materials)
81.15.-z
(Methods of deposition of films and coatings; film growth and epitaxy)
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2013, Vol. 30 
