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학술지 Unraveled Face-Dependent Effects of Multilayered Graphene Embedded in Transparent Organic Light-Emitting Diodes
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저자
임종태, 김재수, 이현구, 문제현, 권병화, 안성덕, 조남성, 안병욱, 이정익, 임규욱, 임성주
발행일
201712
출처
ACS Applied Materials & Interfaces, v.9 no.49, pp.43105-43112
ISSN
1944-8244
출판사
American Chemical Society(ACS)
DOI
https://dx.doi.org/10.1021/acsami.7b13973
협약과제
17HB2100, Skintronics를 위한 감각 입출력 패널 핵심 기술 개발, 이정익
초록
With increasing demand for transparent conducting electrodes, graphene has attracted considerable attention, owing to its high electrical conductivity, high transmittance, low reflectance, flexibility, and tunable work function. Two faces of single-layer graphene are indistinguishable in its nature, and this idea has not been doubted even in multilayered graphene (MLG) because it is difficult to separately characterize the front (first-born) and the rear face (last-born) of MLG by using conventional analysis tools, such as Raman and ultraviolet spectroscopy, scanning probe microscopy, and sheet resistance. In this paper, we report the striking difference of the emission pattern and performance of transparent organic light-emitting diodes (OLEDs) depending on the adopted face of MLG and show the resolved chemical and physical states of both faces by using depth-selected absorption spectroscopy. Our results strongly support that the interface property between two different materials rules over the bulk property in the driving performance of OLEDs.
키워드
graphene electrodes, luminescence properties, near-edge X-ray absorption fine structure, organic light-emitting diodes, surface states
KSP 제안 키워드
Absorption Spectroscopy, Analysis tools, Bulk property, Different materials, Driving Performance, Electrical conductivity(EC), Emission pattern, High electrical conductivity, High transmittance, Luminescence property, Near edge X-ray absorption fine structure(NEXAFS)