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학술지 Technical Issues in Graphene Anode Organic Light Emitting Diodes
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저자
문제현, 신진욱, 조현수, 한준한, 조남성, 임종태, 박승구, 최홍규, 최성율, 김지훈, 맹민재, 서재원, 박용섭, 이정익
발행일
201508
출처
Diamond and Related Materials, v.57, pp.68-73
ISSN
0925-9635
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.diamond.2015.03.020
협약과제
14PB2400, 그래핀 소재의 OLED 투명전극과 박막봉지 적용을 위한 기판 사이즈 5.5세대 이상의 그래핀 필름 및 OLED 소자/패널 기초 및 응용 기술 개발, 이정익
초록
Optical, interfacial and patterning issues of anode graphene films in organic light emitting diode (OLED) applications were investigated. In the optical part, the microcavities of graphene and indium tin oxide (ITO) anode OLEDs were contrasted. With the use of graphene one may avoid spectral and organic stack design problems related to microcavity problems. However, due to the weak microcavity, emission enhancement using interference designs is practically impossible. By inserting an electron acceptor insert at the graphene/hole transport layer (HTL) interface, it was possible to enhance the current density by factor of three. Based on in situ ultraviolet photoelectron spectroscopy (UPS) results, the insert was interpreted as being a charge generation layer. Graphene patterning using laser or plasma methods turned out to be problematic. None of those methods could offer acceptable dimension accuracy and preserved graphene quality.
키워드
Graphene, Interfacial properties, Optical properties, Organic light emitting diode, Patterning
KSP 제안 키워드
Charge generation layer, Dimension accuracy, Electron acceptor, Emission enhancement, Interfacial Properties, Organic light-emitting diodes(OLEDS), Stack design, current density, graphene anode, graphene films, graphene patterning