Ultrafast photoluminescence from graphene

Chun Hung Lui, Kin Fai Mak, Jie Shan, Tony F. Heinz

Research output: Contribution to journalArticle

279 Citations (Scopus)

Abstract

Since graphene has no band gap, photoluminescence is not expected from relaxed charge carriers. We have, however, observed significant light emission from graphene under excitation by ultrashort (30-fs) laser pulses. Light emission was found to occur across the visible spectral range (1.7-3.5A eV), with emitted photon energies exceeding that of the excitation laser (1.5A eV). The emission exhibits a nonlinear dependence on the laser fluence. In two-pulse correlation measurements, a dominant relaxation time of tens of femtoseconds is observed. A two-temperature model describing the electrons and their interaction with strongly coupled optical phonons can account for the experimental observations.

Original languageEnglish (US)
Article number127404
JournalPhysical Review Letters
Volume105
Issue number12
DOIs
StatePublished - Sep 16 2010

Fingerprint

graphene
photoluminescence
light emission
lasers
pulses
excitation
charge carriers
fluence
phonons
relaxation time
photons
electrons
interactions
temperature
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Lui, C. H., Mak, K. F., Shan, J., & Heinz, T. F. (2010). Ultrafast photoluminescence from graphene. Physical Review Letters, 105(12), [127404]. https://doi.org/10.1103/PhysRevLett.105.127404
Lui, Chun Hung ; Mak, Kin Fai ; Shan, Jie ; Heinz, Tony F. / Ultrafast photoluminescence from graphene. In: Physical Review Letters. 2010 ; Vol. 105, No. 12.
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Lui, CH, Mak, KF, Shan, J & Heinz, TF 2010, 'Ultrafast photoluminescence from graphene', Physical Review Letters, vol. 105, no. 12, 127404. https://doi.org/10.1103/PhysRevLett.105.127404

Ultrafast photoluminescence from graphene. / Lui, Chun Hung; Mak, Kin Fai; Shan, Jie; Heinz, Tony F.

In: Physical Review Letters, Vol. 105, No. 12, 127404, 16.09.2010.

Research output: Contribution to journalArticle

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