Fe 掺杂 ZnO 纳米颗粒的微观结构和增强的激子-声子耦合。
Microstructure and enhanced exciton-phonon coupling in Fe doped ZnO nanoparticles.
机构信息
Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2013 Feb 15;103:173-8. doi: 10.1016/j.saa.2012.10.028. Epub 2012 Oct 23.
We report the microstructure and exciton-phonon coupling properties of Fe doped ZnO nanoparticles. Particles are prepared through sol-gel method at room temperature. Doping of Fe(3+) induces strain in the host lattice. Microstructural properties are analysed through Williamson-Hall analysis. Optical absorption studies show strong free excitonic absorption band at 369 nm. The photoluminescence (PL) studies reveal that ultraviolet, blue and green emission bands are located at 380, 445 and 500 nm respectively. Fe doped ZnO nanoparticles exhibits only ultraviolet and blue emission bands. Increase of Fe concentration makes green emission gradually disappeared. Gaussian fitted photoluminescence spectra show the emission is composed of free exciton (FX) recombination and its higher orders of longitudinal optical (LO) phonon replicas. Doping induced blue shift in FX peak and also increases the exciton-phonon coupling.
我们报告了 Fe 掺杂 ZnO 纳米粒子的微观结构和激子-声子耦合特性。通过室温下的溶胶-凝胶法制备了粒子。Fe(3+) 的掺杂会导致宿主晶格的应变。通过威廉姆森-霍尔分析对微结构特性进行了分析。光学吸收研究表明，在 369nm 处存在强自由激子吸收带。光致发光（PL）研究表明，紫外、蓝和绿发射带分别位于 380、445 和 500nm 处。Fe 掺杂 ZnO 纳米粒子仅显示紫外和蓝发射带。随着 Fe 浓度的增加，绿光发射逐渐消失。高斯拟合的光致发光谱表明，发射由自由激子（FX）复合及其高阶纵光学（LO）声子的 replicas 组成。掺杂诱导的 FX 峰蓝移也增加了激子-声子耦合。
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