Lasing characteristics of nano-structured zinc oxide

Shou Yi Kuo*, Wei Chun Chen, Fang I. Lai

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Highy-quality nano-structured ZnO samples have been synthesized by simple chemical solution and post-thermal treatment. The samples were characterized by x-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), temperature-dependent photoluminescence (PL) spectra measurements. XRD patterns illustrated that there were no second phases in these ZnO samples, and the TEM results indicated that the ZnO samples are single crystalline with a hexagonal structure. Room-temperature PL spectra of ZnO thin films showed a strong UV near-band-edge (NBE) emission located at about 390 nm and a green defect-related (G) emissions, where the intensity ratio (I NBE/IG) varies with the annealing temperatures. Meanwhile, the ZnO samples exhibited free exciton and very sharp exciton emissions at low temperatures, Particularly, room-temperature UV random lasing characteristic of ZnO films has been observed as well. It is shown that these nano-structured ZnO samples can exhibit random laser action depending on the growth condition. The threshold intensity for the lasing is comparable to earlier reported data, These results indicate that nano-structured ZnO samples prepared by simple techniques may be a promising material for further photonic devices. Possible lasing mechanism is discussed and further investigation to clarify the mechanism between the nano-structured ZnO samples is still underway.

Original languageEnglish
Title of host publicationZinc Oxide and Related Materials
Pages429-433
Number of pages5
StatePublished - 2007
Event2006 MRS Fall Meeting - Boston, MA, United States
Duration: 27 11 200630 11 2006

Publication series

NameMaterials Research Society Symposium Proceedings
Volume957
ISSN (Print)0272-9172

Conference

Conference2006 MRS Fall Meeting
Country/TerritoryUnited States
CityBoston, MA
Period27/11/0630/11/06

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