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Enhancement of Light Extraction Efficiency of Organic Light Emitting Diodes using Spin-on Glass based Randomly Dispersed Nano-pillar Arrays
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- Authors
- Advisor
- 김장주
- Major
- 공과대학 재료공학부(하이브리드 재료)
- Issue Date
- 2013-02
- Publisher
- 서울대학교 대학원
- Description
- 학위논문 (석사)-- 서울대학교 대학원 : 재료공학부(하이브리드 재료), 2013. 2. 김장주.
- Abstract
- Randomly dispersed nano-pillar array (RaDNA) was embedded between the transparent electrode and the glass substrate to extract lights confined inside organic light emitting diodes (OLED). The room-temperature nano-imprining lithography (RT-NIL) was employed for the fabrication of RaDNA. Spin-on glass was utilized as a material of the nano-pillar array for stable devices. The pillar arrays were planarized before fabrication of OLEDs using a high refractive index material (trialkoxysilane-capped PMMA-titania hybrid optical material) to reduce the leakage current. The RaDNA OLED showed 7% enhancement in normal direction and 19% enhancement of light extraction efficiency in an integrating sphere. The emission pattern of RaDNA device showed no variation of emission spectrum with azimuthal angle and viewing angle.
- Language
- English
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