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Journal Article Surface Wrinkle Formation by Liquid Crystalline Polymers for Significant Light Extraction Enhancement on Quantum Dot Light-emitting Diodes
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Authors
Sooyoung Yeom, Hakjeon Kim, Kitae Kim, Chul Woong Joo, Hyunjin Cho, Hyunsu Cho, Sukyung Choi, Won Jun Lee, Yeon Sik Jung, Byoung-Hwa Kwon, Jun-Hee Na
Issue Date
2020-08
Citation
Optics Express, v.28, no.18, pp.26519-26530
ISSN
1094-4087
Publisher
Optical Society of America (OSA)
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1364/OE.401328
Abstract
We propose an optimal outcoupling structure of a quantum-dot light-emitting diode (QLED) and present material properties based on numerical calculations via the ray-tracing method, in which light extraction properties are obtained according to the surface wrinkles on a substrate. After analyzing the designed microstructure elements, the optimal model was derived and applied to the QLEDs; consequently, the outcoupling efficiency enhanced by 31%. The liquid crystalline polymer forming the random surface wrinkles not only achieves an excellent light extraction through plasma crosslinking but also facilitates large-area processes. We propose an optical design rule for high-efficiency QLED design by analyzing the electro-optical efficiency, emission spectrum, and angular radiation pattern of the optical device.
KSP Keywords
Design rule, Electro-optical efficiency, Liquid-crystalline polymer(LCP), Numerical calculation, Optical devices, Optimal model, Quantum Dot(QD), Radiation Pattern, Ray tracing method, designed microstructure, emission spectrum
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