用再沉淀法制备了纳米晶体,向体系中加入水溶性高分子聚乙烯醇(PVA)可有效地抑制纳晶的生长,从而制得了稳定的具有不同粒径的纳晶.光谱研究表明,随着纳晶粒径增加,由于纳晶中分子间相互作用的变化,其吸收峰和激发峰位置都发生了红移,同时纳晶中激基缔合物的荧光发射峰强度减弱,荧光寿命有所延长. The nanocrystals were prepared by the reprecipitation method, and the addition of water-soluble high molecular weight polyvinyl alcohol (PVA) to the system can effectively inhibit the growth of nanocrystals, thus resulting in stable nanocrystals with different particle sizes. With the increase of nanocrystalline particle size, both the absorption peak and the excitation peak shift red-shifted due to the change of the molecular interactions in the nanocrystal. At the same time, the fluorescence emission peak intensity of the excimer in the nanocrystal decreases, and the fluorescence lifetime Extended.