ZnO纳米晶的发光性质

Optical Properties of ZnO Nanocrystals

研究了量子限域体系下 Zn O纳米晶随尺寸变化的发光性质。吸收边随着颗粒尺寸减小发生持续的蓝移。光致发光光谱包含两个发光峰 :一个是紫外激子发射 ,另一个是处于绿光区的杂质或缺陷发射 ,均受量子限域效应调制。带边发射相对于吸收峰的 Stokes移动随着颗粒尺寸减小而增大。

The dependence of the optical properties on the ZnO nanocrystal size in quantum confinement system was investigated. The absorption onset exhibited systematic blue shift with decreasing the particle size. The PL spectra showed two peaks. One is UV exciton emission and the other is trap emission. Both peaks were influenced by quantum confinement effect. The stokes shift between absorption peak and UV emission increased as the particle size decreased. The selective excitation experiment indicated that PL was strongly dependent on the excitation energy.