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Microcavity characteristics analysis of micro-shuttered organic light-emitting diodes

Authors
Lee, Dong JunPark, Soo JongPark, Cheol HweePark, Young WookJu, Byeong-Kwon
Issue Date
31-12월-2019
Publisher
ELSEVIER SCIENCE SA
Keywords
Organic light-emitting diode; Microcavity; Metal electrode; Micro-shuttered
Citation
THIN SOLID FILMS, v.692
Indexed
SCIE
SCOPUS
Journal Title
THIN SOLID FILMS
Volume
692
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/60859
DOI
10.1016/j.tsf.2019.137643
ISSN
0040-6090
Abstract
We demonstrated the control of the microcavity (MC) effect in micro-shuttered organic light-emitting diodes (OLEDs) with the introduction of an Ag striped pattern (ASP) layer between the organic layer and the indium zinc oxide layer. The ASP electrodes demonstrated high flexibility, conductivity, and transmittance. The optical and electrical properties of the OLED devices with micro-scale patterned metal electrodes with varying thicknesses and uncovered (open) area:entire glass surface area ratios (open ratios, ORs) were analyzed. The ASP OLEDs demonstrated high color purity and narrowed emission spectra because of the MC effect, increased light extraction by modulating the OR of the micro-shutter structure, and adjustability of the viewing angle distortion by controlling the OR. The ASP OLEDs exhibited maximum efficiency at the OR of 0.3 (Ag thickness; t(Ag) = 15 nm) because of their optimum transmittance and conductivity. The viewing angle distortion decreased by approximately 60.3% with an increase in the OR from 0 to 0.7, as revealed by the changes in the color coordinates. The results showed that when deposited on flexible substrates, ASP electrodes can be used in flexible devices.
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공과대학 (전기전자공학부)
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