Supercollision cooling effects on the hot photoluminescence emission of graphene.
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Data
2016
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Resumo
We report on hot photoluminescence measurements that show the effects of acoustic phonon
supercollision processes in the intensity of graphene light emission. We use a simple optical
method to induce defects on single layer graphene in a controlled manner to study in detail the
light emission dependence on the sample defect density. It is now well accepted that the
graphene photoluminescence is due to black-body thermal emission from the quasi-equilibrium
electrons at a temperature well above the lattice temperature. Our results show that as the sample
defect density is increased the electrons relax energy more efficiently via acoustic phonon
supercollision processes leading to lower electron temperatures and thus lower emission
intensities. The calculated intensity decrease due to supercollision energy relaxation agrees well
with the experimental data.
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Electron dynamics, Hot photoluminescence, Defects, Graphene
Citação
SOUZA, T. V. de A.; MOREIRA, L. M.; PAULA, A. M. de. Supercollision cooling effects on the hot photoluminescence emission of graphene. Nanotechnology, Bristol, v. 27, p. 2-7, 2016. Disponível em: <https://iopscience.iop.org/article/10.1088/0957-4484/27/44/445710>. Acesso em: 16 jan. 2018.