Simultaneous formation of visible and ultraviolet random lasings in ZnO films

H. D. Li, Siu Fung Yu, Shu Ping Lau, Eunice S.P. Leong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

42 Citations (Scopus)


We have demonstrated visible and ultraviolet random laser actions simultaneously from highly disordered ZnO polycrystalline thin films under optical excitation. It is found that the realization of ZnO grain boundaries by thermal annealing can provide sufficient optical gain (i.e., related to deep-defect-level radiative recombination) and coherent feedback to achieve random laser action at visible wavelength. Furthermore, the coexistence of visible and ultraviolet random lasings inside the highly disordered ZnO films is due to the size difference of the random cavities at different wavelengths.
Original languageEnglish
Article number021110
JournalApplied Physics Letters
Issue number2
Publication statusPublished - 24 Jul 2006
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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