Open AccessEnhanced light extraction efficiency of OLEDs with quasiperiodic diffraction grating layer
Author(s) -
Tae-Bin Lim,
Kwan Hyun Cho,
YongHoon Kim,
YongCheol Jeong
Publication year - 2016
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.24.017950
Subject(s) - materials science , diffraction efficiency , optics , grating , optoelectronics , diffraction grating , oled , diffraction , quantum efficiency , quasiperiodic function , layer (electronics) , nanotechnology , physics , condensed matter physics
We presented enhanced light extraction efficiency of organic light emitting diodes (OLEDs) cells with a nano-sized diffraction grating layer. Various diffraction gratings of different morphologies including linear, cubic, hexagonal and quasiperiodic patterns were fabricated by multiplexing light interference exposure on an azobenzene thin film. The effect of diffraction grating layer on device performances including luminous properties and quantum efficiency was investigated. In contrast to periodic grating patterns, the quasiperiodic structures leading broadband light extraction resulted in improved external quantum efficiency and power efficiency by 73% and 63%, respectively, compared to conventional OLED with flat surface of glass substrate.