Spectral-distortion-free light extraction from organic light-emitting diodes using nanoscale photonic crystal
- Authors
- Shim, Yong Sub; Kim, Kyu Nyun; Hwang, Ju Hyun; Park, Cheol Hwee; Jung, Sun-Gyu; Park, Young Wook; Ju, Byeong-Kwon
- Issue Date
- 27-1월-2017
- Publisher
- IOP PUBLISHING LTD
- Keywords
- organic light-emitting diodes; photonic crystal; laser interference lithography; spectral-distortion-free
- Citation
- NANOTECHNOLOGY, v.28, no.4
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANOTECHNOLOGY
- Volume
- 28
- Number
- 4
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/84868
- DOI
- 10.1088/1361-6528/28/4/045301
- ISSN
- 0957-4484
- Abstract
- Despite their generally good performance, photonic crystal (PC)-based organic light-emitting diodes (OLEDs) encounter a serious spectral distortion problem. In this study, we obtained spectral-distortion-free PC-based OLEDs by lowering the pitch (period of the PC) to less than a half the emission wavelength, using a simple and scalable nanoscale process of laser interference lithography. The demonstrated OLEDs with 200 nm pitch-size nanoscale periodic hole arrays exhibited negligible changes in the Internal Commission on Illumination 1931 color coordinate of Delta (0.0104, 0.0078) and a peak wavelength of Delta 0 nm (relative to the reference), while maintaining the function of the internal light extraction layer, manifested as a 23% enhancement of the external quantum efficiency (EQE). The enhancement of the EQE reached 85% after incorporating a micro-lens array. The improved light extraction, spectral-distortion-free characteristic, and excellent color stability over a broad range of viewing angles were successfully derived by performing finite difference time domain simulations.
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