Wide-bandwidth lasing from C-dot/epoxy nanocomposite Fabry-Perot cavities with ultralow threshold

W. F. Zhang, L. M. Jin, Siu Fung Yu, H. Zhu, S. S. Pan, Y. H. Zhao, H. Y. Yang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

49 Citations (Scopus)


We show that by maximizing the amount of organosilane functional groups, the quantum yield of surface functionalized carbon nanodots (C-dots) dispersed in epoxy can be enhanced to 68% under optical excitation at 450 nm wavelength. This is the highest quantum yield ever recorded for C-dots at such an excitation wavelength. Lasing emission can also be demonstrated from a Fabry-Perot cavity by using C-dots as the gain medium. The lasing threshold is found to be ∼200 W cm-2which is 2 orders of magnitude lower than that provided in the recent reports. Furthermore, tunable single-mode lasing over a bandwidth of ∼60 nm wide is achieved from the Fabry-Perot cavity in the Littrow configuration.
Original languageEnglish
Pages (from-to)1525-1531
Number of pages7
JournalJournal of Materials Chemistry C
Issue number8
Publication statusPublished - 28 Feb 2014

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry


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