Excitonic gain and laser emission in ZnO microcrystallites at room temperature

被引：0
|
作者：
Yu, P [1 ]
Tang, ZK
Wong, GKL
Kawasaki, M
Ohtomo, A
Koinuma, H
Segawa, Y
机构：
[1] Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong
[2] Tokyo Inst Technol, Ceram Mat & Struct Lab, Midori Ku, Yokohama, Kanagawa 227, Japan
[3] Tokyo Inst Technol, CREST, JSTS, Midori Ku, Yokohama, Kanagawa 227, Japan
[4] Inst Phys & Chem Res, Aoba Ku, Sendai, Miyagi 980, Japan
来源：
PHYSICS OF LOW-DIMENSIONAL STRUCTURES | 1998年 / 1-2卷
关键词：
D O I：
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中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Ultraviolet laser emission is observed at room temperature in ZnO thin films consisting of hexagonal microcrystallites. At moderate pumping intensities, the optical gain responsible for lasing is shown to be due to an exciton-exciton collision process. At higher pumping intensities, optical gain due to EHP recombination radiation sets in and dominates the gain spectrum eventually. The exciton emission intensity is observed to depend on the size of the microcrystallites as a result of the weak confinement effect.
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页码：243 / 251
页数：9
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