期刊
ORGANIC ELECTRONICS
卷 17, 期 -, 页码 115-120出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2014.12.006
关键词
Organic light emitting diodes; Light extraction; Image blurring; Color stability
资金
- IT R&D program of MKE/KEIT (Development of fundamental technology for light extraction of OLED) [10041062]
We report a highly enhanced light extraction from a top emission organic light emitting diode with little image blurring and color variation with viewing angle. Direct integration of a high refractive index micro lens array on the top of the transparent indium zinc oxide top electrode of a green phosphorescent OLED showed a significant enhancement of light extraction to get EQE of 44.7% from 27.6%, the power efficiency of 134.7 lm/w from 85.9 lm/W and the current efficiency of 217.2 cd/A from 120.7 cd/A without image blurring. In addition, the device showed excellent color stability on viewing angle with Commission Internationale de l'Eclairage (CIE) coordinate of Delta x = 0.01, Delta y = 0.01 as the viewing angle varied from 0 degrees to 60 degrees. (C) 2014 Elsevier B.V. All rights reserved.
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