Size dependence of photoluminescence and resonant Raman scattering from ZnO quantum dots

被引：145
作者：
Cheng, Hsin-Ming
Lin, Kuo-Feng
Hsu, -Cheng Hsu
Hsieh, Wen-Feng
机构：
[1] Natl Chiao Tung Univ, Dept Photon, Hsinchu 30050, Taiwan
[2] Natl Chiao Tung Univ, Inst Electroopt Engn, Hsinchu 30050, Taiwan
[3] Ind Technol Res Inst, Mat & Chem Res Labs, Hsinchu 310, Taiwan
来源：
APPLIED PHYSICS LETTERS | 2006年 / 88卷 / 26期
关键词：
D O I：
10.1063/1.2217925
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
ZnO quantum dots (QDs) of controlled sizes have been fabricated by a simple sol-gel method. The blueshift of room-temperature photoluminescence measurement from free exciton transition are observed decreasing with the QD size that is ascribed to the quantum confinement effect. From the resonant Raman scattering, the coupling strength between electron and longitudinal optical phonon, deduced from the ratio of the second- to the first-order Raman scattering intensity, diminishes with reducing the ZnO QD diameter. The size dependence of electron-phonon coupling is principally a result of the Frohlich interaction.
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