Bright Multicolored Photoluminescence of Hybrid Graphene/Silicon Optoelectronics

Graphene does not possess a band gap, and hot carrier relaxation in graphene is an ultrafast processs. This leads to a very low emission efficiency of graphene. We demonstrate bright multicolored frequency-upconverted photoluminescence from graphene via three-photon absorption by femtosecond laser i...

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Bibliographic Details
Published in:ACS photonics 2015-07, Vol.2 (7), p.797-804
Main Authors: Liu, Ken, Zhu, Zhi Hong, Li, Xiu Jian, Zhang, Jian Fa, Yuan, Xiao Dong, Guo, Chu Cai, Xu, Wei, Qin, Shi Qiao
Format: Article
Language:English
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Summary:Graphene does not possess a band gap, and hot carrier relaxation in graphene is an ultrafast processs. This leads to a very low emission efficiency of graphene. We demonstrate bright multicolored frequency-upconverted photoluminescence from graphene via three-photon absorption by femtosecond laser injection at a communication wavelength 1.57 μm. The broadband and multiwavelength emission from graphene is based on the model of ultrafast electron–hole pair recombination and asymmetrical energized electron–hole radiation recombination in graphene. Furthermore, we show photoluminescence variation with blue light emission in the graphene/silicon hybrid system, with 2–3 orders of emission efficiency increase. The results demonstrate hot carrier multiplication and hot carrier scattering in graphene and could help to study the population inversion and broadband lasing of graphene.
ISSN:2330-4022
2330-4022
DOI:10.1021/acsphotonics.5b00051