Comparison of organic light emitting diodes with different mixed layer structures

被引：8
作者：
Kee, Y. Y. [1 ]
Siew, W. O. [1 ]
Yap, S. S. [1 ,2 ]
Tou, T. Y. [1 ]
机构：
[1] Multimedia Univ, Fac Engn, Cyberjaya 63100, Malaysia
[2] Univ Malaya, Fac Engn, Kuala Lumpur 50603, Malaysia
来源：
THIN SOLID FILMS | 2014年 / 570卷
关键词：
OLEDs; Uniformly mixed; Continuously graded mixed; Step-wise graded mixed; DEVICES; JUNCTION;
D O I：
10.1016/j.tsf.2014.04.042
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A mixed-source thermal evaporation method was used to fabricate organic light emitting diodes (OLEDs) with uniformly mixed (UM), continuously graded mixed (CGM) and step-wise graded, mixed (SGM) light-emitting layers. N,N'-Bis(3-methylphenyl)-N, N'-diphenylbenzidine and Tris-(8-hydroxyquinoline) aluminum were used, respectively, as the hole-and electron-transport materials. As compared to the conventional, heterojunction OLED, the maximum brightness of UM-, CGM- and SGM-OLEDs without charge injection layers were improved by 2.2, 3.8 and 2.1 times, respectively, while the maximum power efficiencies improved by 1.5, 3.2 and 1.9 times. These improvements were discussed in terms of more distributed recombination zone and removal of interfacial barrier. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：539 / 542
页数：4
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