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Is There Real Upconversion Photoluminescence from Graphene Quantum Dots?
Author(s) -
Gan Zhixing,
Wu Xinglong,
Zhou Gengxia,
Shen Jiancang,
Chu Paul K.
Publication year - 2013
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201300152
Subject(s) - photon upconversion , photoluminescence , materials science , femtosecond , quantum dot , optoelectronics , excited state , laser , graphene , nanotechnology , optics , physics , luminescence , quantum mechanics
Upconversion photoluminescence (PL) from graphene quantum dots (GQDs) excited by a xenon lamp is artificial. It is essentially excited by the second‐order diffraction light of wavelength λ/2 co‐existing in the red light. Real upconversion PL from GQDs is observed under excitation with a femtosecond pulsed laser, implying that coherent photons with high enough power density can be upconverted into blue light via GQDs.