采用荧光发射法研究了不同Cd2+与树形分子的摩尔比 (负载比)条件下硫化镉(CdS)/ 聚酰胺-胺 (PAMAM)树形分子纳米复合材料 (NCs)水溶液的荧光性能， 并探索了其荧光产生的机理。 结果表明: 在波长330 nm光的激发下， CdS/G4.0-NH2 PAMAM NCs的荧光发射光谱中出现了2个峰， 一个是PAMAM树形分子的荧光发射峰， 另一个是CdS量子点的荧光发射峰。 随着负载比的增加， 前一个荧光发射峰逐渐变弱， 并消失后一个荧光发射峰逐渐增强， 表明PAMAM树形分子N原子上的价电子跃迁到CdS QDs上。 发蓝色荧光的纯PAMAM树形分子水溶液对塑料表面的油印潜指纹显现效果不佳， 原因是塑料含蓝色荧光杂质; 采用负载比为10的CdS/G4.0-NH2 PAMAM树形分子NCs水溶液显现塑料表面指纹时， 发现潜指纹发射出明亮黄色荧光可以被清晰识别， 这对含不同颜色荧光杂质的客体表面潜指纹的显现有很好的借鉴价值。

The photoluminescence property of CdS/PAMAM nanocomposites in water at different ratio of Cd2+ to PAMAM(r) was studied by fluorescence emission spectrum, and the according mechanism was explored. The results indicate that in the irradiation of UV light at the wavelength of 330 nm, two peaks were shown in the fluorescence emission spectrum of CdS/PAMAM nanocomposites. One peak was attributed to PAMAM dendrimers, and the another came from CdS QDs. The strength of the frontier fluorescence emission peak became weaker and weaker, and at last disappeared with the enhancement of the ratio of Cd2+ to PAMAM; the strength of the latter fluorescence emission peak became stronger, which indicates that the electron at valence band of N atom in amines of dendrimers was transferred to CdS QDs. Oil latent finger marks deposited on transparent adhesive tapes surface treated with pure PAMAM solution with blue photoluminescence was not clear enough because of the blue light emitted from the impurity in adhesive tapes; Latent finger marks emitted strong yellow light and were successfully detected with good resolving rate with CdS/dendrimer solution with r of 10, which shows good reference value for detecting finger marks on surfaces with impurities emitting different photoluminescence colors.