Photoluminescence and Raman scattering of ZnO nanorods
Photoluminescence and Raman scattering of ZnO nanorods
复制标题
DOI：
10.1016/j.solidstatesciences.2008.10.016
复制
发表时间：
2009-04-01
影响因子：
3.5
通讯作者：
Guo, Lin
中科院分区：
文献类型：
--
作者：
Zhang, Rui;Yin, Peng-Gang;Guo, Lin
采用一种简单的微乳液法制备了氧化锌纳米棒。测量了室温下的光致发光(PL)光谱。较强的UV激子发射表明晶体具有良好的光学性质，而较弱的深能级发射揭示了晶体中非常有限的结构缺陷。在15K下得到的荧光光谱中的多个峰归属于施主束缚激子(DBE)、自由到束缚跃迁(FB)和FB-LO声子复制品。各发射带的能量、强度和线宽与温度的关系证实了激子的热电离过程和热激活的非辐射复合的影响。用He-Ne激光(波长632.8 nm)激发了室温下的非共振喇曼散射光谱。通过包括低频振动和高频振动在内的强E-2模验证了纳米棒中纤锌矿的完美结构。通过室温下的共振拉曼散射光谱研究了振动模红移和展宽的可能原因。拉曼频移和半高宽随功率的变化显示了激光对振动模的辐照效应。(C)2008年，爱思唯尔·马森公司出版。
Zinc oxide (ZnO) nanorods were synthesized by a simple microemulsion method. The photoluminescence (PL) spectra at room temperature were measured. The Strong UV excitonic emission indicates the good optical properties, and the weak deep-level emission reveals very limited structural defects in the crystals. The multiple peaks in the PL spectrum obtained at 15 K are assigned to the donor-bound exciton (DBE), free to bound transition (FB) and FB-LO phonon replicas. The temperature dependence of energy, intensity, and linewidth of each emission band confirms the effect of thermal ionization progress of excitons and nonradiative recombination activated thermally. The nonresonant Raman scattering spectra at room temperature were excited by He-Ne laser (wavelength similar to 632.8 nm). The perfect wurtzite structure in ZnO nanorods has been verified by the intense E-2 modes, which include low and high frequency vibrations. The possible reasons for the red shift and broadening of vibration modes were studied by the resonant Raman scattering spectra at room temperature. The power-dependence of Raman shift and FWHM shows the laser irradiation effect on the vibrational modes. (C) 2008 Published by Elsevier Masson SAS.