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Plasmon-Enhanced Ultraviolet Photoluminescence from Hybrid Structures of Graphene/ZnO Films

Cited 111 time in Web of Science Cited 116 time in Scopus
Authors
Hwang, Sung Won; Shin, Dong Hee; Kim, Chang Oh; Hong, Seung Hui; Kim, Min Choul; Kim, Jungkil; Lim, Keun Yong; Kim, Sung; Choi, Suk-Ho; Ahn, Kwang Jun; Kim, Gunn; Sim, Sung Hyun; Hong, Byung Hee
Issue Date
2010-09
Citation
Physical Review Letters, Vol.105 No.12, p. 127403
Abstract
We report substantially enhanced photoluminescence (PL) from hybrid structures of graphene/ZnO films at a band gap energy of ZnO (similar to 3.3 eV/376 nm). Despite the well-known constant optical conductivity of graphene in the visible-frequency regime, its abnormally strong absorption in the violet-frequency region has recently been reported. In this Letter, we demonstrate that the resonant excitation of graphene plasmon is responsible for such absorption and eventually contributes to enhanced photoemission from structures of graphene/ZnO films when the corrugation of the ZnO surface modulates photons emitted from ZnO to fulfill the dispersion relation of graphene plasmon. These arguments are strongly supported by PL enhancements depending on the spacer thickness, measurement temperature, and annealing temperature, and the micro-PL mapping images obtained from separate graphene layers on ZnO films.
ISSN
0031-9007
URI
https://hdl.handle.net/10371/172268
DOI
https://doi.org/10.1103/PhysRevLett.105.127403
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College of Natural Sciences (자연과학대학)Dept. of Chemistry (화학부)Journal Papers (저널논문_화학부)
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