锂掺杂氧化锌纳米颗粒晶体结构与光学特性分析

摘要

利用溶胶-凝胶法制备了LixZn1-xO纳米颗粒,分析了锂掺杂对氧化锌纳米颗粒晶体结构与光学特性的影响.结果表明,锂掺杂会使氧化锌所受应力由压缩应力变为伸张应力,晶粒尺寸随锂掺杂量增加而减小,并且使氧化锌容易朝向(002)方向成长,造成结构系数TC(002)增大.光致发光光谱观测揭示锂掺杂能促使氧空位相关缺陷增多.同时也使得近能带发光强度增强.拉曼光谱显示多声子模态随锂掺杂量增加而减弱,且掺杂量为0.10(物质的量分数)时多声子模态信号最小,而掺杂量为0.15(物质的量分数)时多声子模态信号再度增强.多声子模态信号与非辐射复合相关,多声子模态信号越弱表示非辐射复合缺陷越少,故造成光致发光光谱的NBE峰强度增强.%The LixZn1-xO nanoparticles were prepared by sol-gel method and the effects of Li doping on their lattice structure and optical property were studied.The results showed that the compressive stress of ZnO became stretching stress with Li doping and the grain size decreased with Li content increasing,which led to ZnO be grown at orientation of(002) easily and the value of texture coefficient TC (002) became larger.The PL spectrum revealed that the related defects of Vo increased due to Li doping and the luminous intensity of near energy-band became larger at the same time.The Raman spectrum gave that the multiphonon modes decreased with Li content increasing.The signals of multiphonon modes were the least for 0.10 (amount-of-substance fraction) of Li doping and then increased for 0.15 (amount-of-substance fraction) of Li doping.The signals of multiphonon modes were related to the nonradiative recombination.The poorer the signals of multiphonon modes,the less the nonradiative recombination,and then it made the NBE peak strength of PL spectrum be larger.