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P‐205L: Late‐News Poster : Improvement of Viewing Angle Dependence and Out‐Coupling Efficiency of OLEDs with Strong Microcavity Structure by Introduction of Nanoporous Polymer Films
Author(s) -
Pyo Beom,
Kim Hyung Suk,
Joo Chul Woong,
Kwon Byoung-Hwa,
Lee Jeong-Ik,
Lee Jonghee,
Suh Min Chul
Publication year - 2016
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 - 10.1002/sdtp.11068
Subject(s) - nanoporous , oled , materials science , optoelectronics , viewing angle , quantum efficiency , scattering , diode , polymer , layer (electronics) , coupling (piping) , optics , nanotechnology , composite material , physics , liquid crystal display
To improve a viewing angle characteristic as well as a light extraction effect, we fabricated nanoporous polymer film (NPF) as a scattering medium as well as a light extraction component. We designed two types of organic light emitting diodes (OLEDs) with strong microcavity effect containing two different hole transport layer (HTL) thickness (e.g. 30 nm and 60 nm) to investigate each optical behavior of NPF. Very interestingly, we could observe a significant enhancement of external quantum efficiency (EQE) for each device [30 nm thick HTL : 18.0 %, 60nm thick HTL : 31.6 %] when we attached 125 um thick PET film coated with NPF. Furthermore, NPF successfully suppress the viewing angle dependence to realize ideal angular emission even though it's somehow different from that of Lambertian distribution.