半导体纳米微粒由于量子限域效应(Quantum confinement effect)而产生一系列新现象,其中超快速的光学非线性响应倍受注目,预期它将成为未来光电子学应用的基础材料.研究纳米微粒光吸收及弛豫性质,有助于我们深入探讨其光学非线性的响应机制.当半导体微粒尺寸小到位于其体相的激子玻尔半径 a_B 的尺度时,可以观察到一系列的电子态与光学性质的变化,这样的例子有 CdS,CuCl,CdSe,PbS 等半导体微晶体系, Semiconductor nanoparticles due to the quantum confinement effect (Quantum confinement effect) and a series of new phenomena, including ultra-fast optical nonlinear response has attracted much attention, it is expected to become the future of optoelectronic applications, the basic material to study nanoparticle light absorption and Relaxation properties, help us to further explore its optical nonlinear response mechanism.When the semiconductor particle size is small to the exciton Bohr radius of the bulk phase on the scale of a B, we can observe a series of electronic and optical properties Of the changes, such as CdS, CuCl, CdSe, PbS and other semiconductor microcrystalline system,