Direct formation of random wrinkle on emission surface for improved light out coupling and stable angular spectrum of white organic light emitting diodes
| Autor: | Byoung-Gon Yu, Sohyeon Kang, Chul Woong Joo, Jaehyun Moon, Jonghee Lee, Jiwhan Noh, Nam Sung Cho, Byeong-Hak Ha, Jooyeon Kim |
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| Rok vydání: | 2019 |
| Předmět: |
Surface (mathematics)
Coupling Work (thermodynamics) Laser ablation Materials science business.industry Biophysics 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Biochemistry Atomic and Molecular Physics and Optics Spectral line 0104 chemical sciences Angular spectrum method OLED Optoelectronics Quantum efficiency 0210 nano-technology business |
| Zdroj: | Journal of Luminescence. 205:66-71 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2018.09.003 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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