Open AccessImprovement of viewing angle and pixel contrast ratio in green top-emitting organic light-emitting devices
Author(s) -
Shufen Chen,
Wenfa Xie,
Wei Huang,
Shiyong Liu
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.008868
Subject(s) - cathode , materials science , viewing angle , oled , brightness , optics , contrast ratio , luminous efficacy , optoelectronics , layer (electronics) , green light , pixel , liquid crystal display , blue light , nanotechnology , chemistry , physics
Green top-emitting organic light-emitting devices based on tris-(8-hydroxyl-quinoline) aluminum are fabricated with a low reflective Sm/Ag cathode and a comparative Al/Ag cathode. An additional 2,9-dimethyl-4,7-diphenyl-1, 10-phenanthroline (BCP) layer, used as a light outcoupling layer, is deposited onto the SmAg cathode to improve device performances. The influence of different cathodes and the BCP layer on electrical and optical characteristics are investigated and discussed. It is worth mentioning that the introduction of the BCP layer not only enhances the brightness and the luminous efficiency but also improves the viewing angle and the pixel contrast ratio.