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Journal Article
Direct Formation of Random Wrinkle on Emission Surface for Improved Light Out Coupling and Stable Angular Spectrum of White Organic Light Emitting Diodes
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- Authors
- Sohyeon Kang, Chul Woong Joo, Byeong-Hak Ha, Jooyeon Kim, Jonghee Lee, Byoung-Gon Yu, Nam Sung Cho, Jiwhan Noh, Jaehyun Moon
- Issue Date
- 2019-01
- Citation
- Journal of Luminescence, v.205, pp.66-71
- ISSN
- 0022-2313
- Publisher
- Elsevier
- Language
- English
- Type
- Journal Article
- Abstract
- To enhance the light out coupling and stabilize the angular spectrum of white organic light emitting diodes (WOLEDs), we formed a randomly distributed corrugation directly on the external glass surface. Using a metallic master, which was prepared using laser ablation, we have imprinted the corrugation pattern directly on the glass surface. Our method yields 32% increase in the external quantum efficiency, widened luminance distribution and low angular spectra variation. Considering WOLED as a lighting source, this feature is particularly appealing. Besides the implications of the spectrally stable efficient WOLEDs through random corrugation, our work suggests a new structural approach for various light applications in which efficiency and spectral stability matter.
- KSP Keywords
- Angular spectrum, External Quantum Efficiency, Glass surface, LASER ablation, Spectral stability, light emitting diodes(LED), lighting source, luminance distribution, organic light emitting diode(OLED), quantum efficiency(QE), structural approach