High-external-quantum-efficiency organic light-emitting devices
High-external-quantum-efficiency organic light-emitting devices
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DOI：
10.1364/ol.22.000396
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发表时间：
1997-03-15
期刊：
影响因子：
3.6
通讯作者：
Thompson, ME
中科院分区：
文献类型：
--
作者：
Gu, G;Garbuzov, DZ;Thompson, ME
We study the internal and external quantum efficiencies of vacuum-deposited organic light-emitting devices (OLED's). The internal quantum efficiency of OLED's based on tris-(8-hydroxyquinoline) aluminum is calculated to be 5.7 times the observed external quantum efficiency eta(e), consistent with measurements. We demonstrate a shaped substrate that increases eta(e) by a factor of 1.9 +/- 0.2 over similar OLED's fabricated upon flat glass substrates and leads to a 100%-emissive aperture, i.e., the emitting area completely occupies the display area even in the presence of metal interconnects. We also discuss a substrate structure that increases eta(e) by an additional factor of 2. The high device efficiencies are promising for developing OLED-based displays with extremely low power consumption and increased operational lifetime. (C) 1997 Optical Society of America.
