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학술지 Blue Fluorescent Organic Light Emitting Diodes with Multilayered Graphene Anode
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저자
황주현, 최홍규, 문제현, 신진욱, 주철웅, 한준한, 조두희, 허진우, 최성율, 이정익, 추혜용
발행일
201206
출처
Materials Research Bulletin, v.47 no.10, pp.2796-2799
ISSN
0025-5408
출판사
Pergamon
DOI
https://dx.doi.org/10.1016/j.materresbull.2012.04.087
협약과제
12ZB1100, 융?복합부품 핵심기술 연구, 남은수
초록
As an innovative anode for organic light emitting devices (OLEDs), we have investigated graphene films. Graphene has importance due to its huge potential in flexible OLED applications. In this work, graphene films have been catalytically grown and transferred to the glass substrate for OLED fabrications. We have successfully fabricated 2 mm × 2 mm device area blue fluorescent OLEDs with graphene anodes which showed 2.1% of external quantum efficiency at 1000 cd/m 2. This is the highest value reported among fluorescent OLEDs using graphene anodes. Oxygen plasma treatment on graphene has been found to improve hole injections in low voltage regime, which has been interpreted as oxygen plasma induced work function modification. However, plasma treatment also increases the sheet resistance of graphene, limiting the maximum luminance. In summary, our works demonstrate the practical possibility of graphene as an anode material for OLEDs and suggest a processing route which can be applied to various graphene related devices. © 2012 Elsevier Ltd. All rights reserved.
키워드
B. Electrical properties, D. Optical properties
KSP 제안 키워드
2 mm, External Quantum Efficiency, Glass substrate, Organic light-emitting device(OLED), Organic light-emitting diodes(OLEDS), Processing route, anode materials, electrical properties(I-V curve), flexible OLEDs, graphene anode, graphene films