为研究强光激励下纳米氧化锌发光机制,以气相传输法制备的冠状样品为对象,室温下以1 100 nm与1 150 nm脉冲激光以及350 nm氙灯对其进行激励,观测光致发光谱.根据光强关系和强场与物质作用的三阶微扰理论,认为 1 100,1 150 nm激光激励下的样品的紫外与可见光波段的辐射机理分别归因于样品中三光子吸收和二次谐波效应.同时,基于激子非弹性碰撞复合机制,对紫外辐射的红移现象进行了分析.

For the sake of investigating the photoluminescence (PL) characteristics and the mechanims from zinc oxide nanocrystals,the crown-like nanostructural samples prepared by vapor phase transport method were excited by laser pulse and Xe-lamp.Under 1 100 nm and 1 150 nm excitation,the ultroviolet emission at 388 nm and visible emission at 575 nm were observed.Based on the third disturbation theory of the interaction between intensive light field and matter and the relationship between the emission intensity and excitation power,it is confirmed that the emission performances under 1 100 nm and 1 150 nm excitation should be attributed to the three-photon absorption process and the second harmonic generation effects.Moreover,the redshift phenomena of the ultroviolet emission was analyzed based on the exciton-exciton inelastic collision recombination process.