Premium
P‐113: Efficiency and Image Enhancement of Flexible Organic Light‐Emitting Devices by Using Antireflection Nanopillars
Author(s) -
Ho YuHsuan,
Liu ChungChun,
Liang Hsun,
Chen KuanYu,
Chu ChihWei,
Wei PeiKuen
Publication year - 2011
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3621151
Subject(s) - nanopillar , materials science , optoelectronics , transmittance , optics , contrast ratio , polycarbonate , nanostructure , nanotechnology , composite material , physics
We present an antireflection structure consisted of tapered nanopillars to simultaneously increase light extraction efficiency and image contrast of flexible organic light‐emitting devices. The nanopillars were made by imprinting the anodized aluminum oxide on polycarbonate substrates. The thermal viscosity effect formed the nanopillars with tapered shapes. Such tapered nanopillars show excellent antireflection properties for a wide range of incident angles and wavelengths. The transmittance was greatly improved from 52.8% to 89.1% at 60° incident angle for 150‐nm‐height nanopillars. With this antireflection structure, the device efficiency was improved 69% as compared to devices with flat substrates. Due to wide‐angle antireflection, the ANSI image contrast ratio was also significantly improved.