An efficient non-Lambertian organic light-emitting diode using imprinted submicron-size zinc oxide pillar arrays
Author
Liu, S. W.
Wang, J. X.
Divayana, Y.
Dev, K.
Tan S.T.
Demir, Hilmi Volkan
Sun, X. W.
Date
2013Source Title
Applied Physics Letters
Print ISSN
0003-6951
Publisher
AIP
Volume
102
Issue
5
Language
English
Type
ArticleItem Usage Stats
390
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Abstract
We report phosphorescent organic light-emitting diodes with a substantially improved light outcoupling efficiency and a wider angular distribution through applying a layer of zinc oxide periodic nanopillar arrays by pattern replication in non-wetting templates technique. The devices exhibited the peak emission intensity at an emission angle of 40° compared to 0° for reference device using bare ITO-glass. The best device showed a peak luminance efficiency of 95.5 ± 1.5 cd/A at 0° emission (external quantum efficiency - EQE of 38.5 ± 0.1%, power efficiency of 127 ± 1 lm/W), compared to that of the reference device, which has a peak luminance efficiency of 68.0 ± 1.4 cd/A (EQE of 22.0 ± 0.1%, power efficiency of 72 ± 1 lm/W). © 2013 American Institute of Physics.
Keywords
Emission angleExternal quantum efficiency
Light outcoupling
Nano-pillar arrays
Non-wetting
Organic light emitting diodes(OLEDs)
Pattern replication
Peak emissions
Peak luminance
Phosphorescent organic light-emitting diodes
Pillar arrays
Power efficiency
Reference devices
Angular distribution
Electronic equipment
ITO glass
Organic light emitting diodes (OLED)
Zinc oxide
Efficiency
Permalink
http://hdl.handle.net/11693/21084Published Version (Please cite this version)
http://dx.doi.org/10.1063/1.4791786Collections
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