Oxygen induced strained ZnO nanoparticles: an investigation of Raman scattering and visible photoluminescence

被引：34

作者：

Gaikwad, Shrikrushna Shivaji ^{[1
]}

Gandhi, Ashish Chhaganlal ^{[1
]}

Pandit, Swarada D. ^{[2
]}

Pant, Jayashree ^{[2
]}

Chan, Ting-Shan ^{[3
]}

Cheng, Chia-Liang ^{[1
]}

Ma, Yuan-Ron ^{[1
]}

Wu, Sheng Yun ^{[1
]}

机构：

[1] Natl Dong Hwa Univ, Dept Phys, Hualien 97401, Taiwan

[2] Univ Pune, Abasaheb Garware Coll, Dept Phys, Pune, Maharashtra, India

[3] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan

来源：

JOURNAL OF MATERIALS CHEMISTRY C | 2014年 / 2卷 / 35期

关键词：

SEMICONDUCTOR CLUSTERS; OPTICAL-PROPERTIES; RESONANCE; LUMINESCENCE; TEMPERATURE; GROWTH; NANOCRYSTALS; NANOWIRES; CRYSTAL;

D O I：

10.1039/c4tc00566j

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report the influence of the nanosized effect on the optical properties of non-centrosymmetric ZnO nanoparticles. In this study confocal Raman scattering was employed to investigate the strain effect of the softening A(1)(LO) phonon mode white controlling particle sizes from 55 +/- 1 to 32 +/- 1 nm. The observations reveal a positive Poisson ratio between the compressive-and tensile-strain. The intensity ratio of the A(1)(2LO)/A(1)(LO) modes exhibits strong size dependence. As the particle sizes decrease further, the ratio decreases rapidly, signaling the short-range electron-phonon coupling effect which confines the electrons and holes within a smaller volume. An energy red-shift in the photoluminescence peak was observed, because of a lowering in the strain of local symmetry at O2- sites caused by excess oxygen, and by strong coupling between the electron and phonon vibration. The variation of the bandgap is very sensitive to the electron-phonon coupling and the distinct size effect of strained ZnO nanoparticles.

引用

页码：7264 / 7274

页数：11

共 59 条

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