Influence of annealing on stimulated emission in ZnO nanorods

Wai Ming Kwok, Aleksandra B. Djurišić, Yu Hang Leung, D. Li, K. H. Tam, D. L. Phillips, W. K. Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

91 Citations (Scopus)


Vertically aligned ZnO nanorod arrays with rod lengths in the range of 200-1500 nm were fabricated by a hydrothermal method. No stimulated emission was observed in as grown nanorods. Annealing of the rods in forming gas and oxygen significantly affected their optical properties and enabled the achievement of stimulated emission. The lowest lasing threshold and defect emission as well as the longest spontaneous emission decay times were obtained for nanorods annealed in oxygen flow. This indicates that interstitial oxygen, which is commonly assumed to be the cause of yellow-green defect emission, is not the dominant defect in hydrothermally grown nanorods.
Original languageEnglish
Article number183112
JournalApplied Physics Letters
Issue number18
Publication statusPublished - 13 Nov 2006
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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