Contrast improvement of organic light-emitting devices with Sm:Ag cathode -: art. no. 083507

被引：30
作者：
Lau, KC
Xie, WF
Sun, HY
Lee, CS
Lee, ST [1 ]
机构：
[1] City Univ Hong Kong, Ctr Super Diamond & Adv Films, Hong Kong, Hong Kong, Peoples R China
[2] City Univ Hong Kong, Dept Phys & Mat Sci, Hong Kong, Hong Kong, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2006年 / 88卷 / 08期
关键词：
D O I：
10.1063/1.2172019
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Sm:Ag, easily fabricated via simple thermal evaporation, was investigated as a single-layer light-absorbing cathode to increase the contrast ratio of organic light-emitting devices (OLEDs). The performance of OLEDs with Sm:Ag cathode was found to be comparable to that of the traditional OLEDs with Mg:Ag cathode in terms of brightness, electroluminescence (EL) efficiency, and turn-on voltage. The maximum EL efficiency of the device with Sm:Ag black cathode is 2.72 cd/A at 15 V, while the contrast ratio reaches 390:1 at 10 V under 140 lx of ambient light, which is 8 times better than that of the traditional device. The lower EL efficiency and enhanced contrast are due to the reduced optical reflectance of Sm:Ag black cathode, which was calculated to be about 0.15. (c) American Institute of Physics.
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