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학술지 Flexion Bonding Transfer of Multilayered Graphene as a Top Electrode in Transparent Organic Light-Emitting Diodes
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임종태, 이현구, 조현수, 권병화, 조남성, 이봉국, 박종혁, 김재수, 한준한, 양종헌, 유병곤, 황치선, 임성주, 이정익
Scientific Reports, v.5, pp.1-11
Nature Publishing Group
15MB1600, 미래광고 서비스를 위한 에너지절감형 환경적응 I/O (Input/Output) 플랫폼 기술 개발, 황치선
Graphene has attracted considerable attention as a next-generation transparent conducting electrode, because of its high electrical conductivity and optical transparency. Various optoelectronic devices comprising graphene as a bottom electrode, such as organic light-emitting diodes (OLEDs), organic photovoltaics, quantum-dot LEDs, and light-emitting electrochemical cells, have recently been reported. However, performance of optoelectronic devices using graphene as top electrodes is limited, because the lamination process through which graphene is positioned as the top layer of these conventional OLEDs is a lack of control in the surface roughness, the gapless contact, and the flexion bonding between graphene and organic layer of the device. Here, a multilayered graphene (MLG) as a top electrode is successfully implanted, via dry bonding, onto the top organic layer of transparent OLED (TOLED) with flexion patterns. The performance of the TOLED with MLG electrode is comparable to that of a conventional TOLED with a semi-transparent thin-Ag top electrode, because the MLG electrode makes a contact with the TOLED with no residue. In addition, we successfully fabricate a large-size transparent segment panel using the developed MLG electrode. Therefore, we believe that the flexion bonding technology presented in this work is applicable to various optoelectronic devices.
KSP 제안 키워드
Bonding technology, Bottom electrode, Electrical conductivity(EC), High electrical conductivity, Lamination process, Light-emitting electrochemical cells(LECs), Next-generation, Optical transparency, Organic layers, Organic light-emitting diodes(OLEDS), Organic photovoltaics(OPVs)