Open AccessEnhanced out-coupling factor of microcavity organic light-emitting devices with irregular microlens array
Author(s) -
Jongsun Lim,
Seung Seok Oh,
Doo Youp Kim,
SangHee Cho,
In Tae Kim,
Sang Heon Han,
Hideo Takezoe,
Eun Ha Choi,
Guang Sup Cho,
Young Hun Seo,
Seung Oun Kang,
Byoungchoo Park
Publication year - 2006
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.14.006564
Subject(s) - microlens , oled , materials science , electroluminescence , optoelectronics , coupling (piping) , optics , viewing angle , light emitting diode , cathode , liquid crystal display , layer (electronics) , lens (geology) , physics , nanotechnology , chemistry , metallurgy
We studied microcavity organic light-emitting devices with a microlens system. A microcavity for organic light-emitting devices (OLED) was fabricated by stacks of SiO(2) and SiN(x) layers and a metal cathode together with the microlens array. Electroluminescence of the devices showed that color variation under the viewing angle due to the microcavity is suppressed remarkably by microlens arrays, which makes the use of devices acceptable in many applications. It was also demonstrated that the external out-coupling factor of the devise increases by a factor of ~1.8 with wide viewing angles compared to conventional OLEDs.