Multiphonon scattering and non-radiative decay in ZnO nanoparticles

被引：15

作者：

Senthilkumar, K. ^{[1
]}

Tokunaga, M. ^{[1
]}

Okamoto, H. ^{[1
]}

Senthilkumar, O. ^{[2
]}

Lin, J. ^{[3
]}

Urban, B. ^{[3
]}

Neogi, A. ^{[3
]}

Fujita, Y. ^{[1
]}

机构：

[1] Shimane Univ, Interdisciplinary Fac Sci & Engn, Matsue, Shimane 6908504, Japan

[2] Shimane Univ, Res Project Promot Inst, Matsue, Shimane 6908504, Japan

[3] Univ North Texas, Dept Phys, Denton, TX 76203 USA

来源：

PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 7 NO 6 | 2010年 / 7卷 / 06期

关键词：

ZnO nanoparticles; phonons; defect levels; time-resolved photoluminescence; Raman spectra; EMISSION;

D O I：

10.1002/pssc.200983203

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

ZnO nanoparticles were prepared using a simple evaporation technique at pressures of 75 and 760 torr. A wide visible emission was recorded from both samples using photoluminescence spectroscopy. The presence of green emission at 530 nm is due to deep level defects of vacant zinc V-Zn, and/or their complexes in the ZnO band gap. The fundamental optical phonon modes were identified in addition to multiphonon combination of optical and acoustical overtones and nitrogen related local vibrational modes using Raman backscattering. The existence of multiphonons induces the non-radiative processes. The life time of both the radiative and non-radiative processes is discussed using time resolved photoluminescence spectroscopic results. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：1586 / 1588

页数：3

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