中文摘要：

采用水热法直接合成了高发光强度的ZnS：Cu，Al纳米荧光粉。XRD和TEM测试结果表明，合成纳米晶为纯立方相结构，球形纳米晶尺寸约15nm，尺寸分布窄，分散性好。首次系统地研究了不同[S^2-]／En^2＋]和[Al^3＋]／[Cu^2＋]比值对清洗样品和不清洗样品的光致发光（PL）光谱的影响。实验结果表明，激活剂浓度不变而改变[S^2-]/[Zn^2＋]摩尔比时，发光强度显著变化，同时未清洗样品的PL强度均比清洗样品的强，且未清洗样品强度增强的比值在低的[S^2＋]／[Zn^2＋]时更显著。这说明其发光机理为紫外光激发材料表面的发光中心，即PL强度决定于纳米材料的表面态，此外掺杂的激活剂摩尔比同样对PL光谱有影响。在我们的实验中，用343nm紫外光激发时，n[S^2-]：n[Zn^2＋]=3，n[Al^3＋]：n[Cu^2＋]=2时未清洗样品的发光最强，此时于室内照明条件下可观察到明亮的绿光。

英文摘要：

In this paper, highly luminescent ZnS：Cu, Alnano-phosphors were synthesized directly by hydrotherreal method（200℃）. According to the XRD and TEM measurement results, the synthesized spherical-like nanocrystals and narrow grain size distribution possess the cubic structure,and the average grain size is about 15nm. The photo lumineseence（PL） spectra with rinsed and unrinsed samples under various molar ratios of S/Zn and Cu/AI have been systematically investigated for the first time. The result indicated that the S/Zn strongly influenced the PL emission intensity and the PL intensity of unrinsed sample stronger then rinsed sample, furthermore,at low ratio of S/Zn,the emission intensity is enhanced more significantly. In addition, the molar ratio of activators also affects the PL emission spectra. The results show that the luminescence mechanism of PL spectra attribute to the luminescence centers situated on surface regions of crystal directly detected by UV light,so the emission intensity determined by the surface state of nano-materials. In our experiment,the optimal condition is the unrinsed sample under n[Cu^2＋ ]/n[Zn^2＋ ] = 0. 0003, n[Cu^2＋ ]/n[Al^3＋] = 2 and n[S^2- ]/n[Zn^2＋]=3, and the bright green light can he observed with the naked eye in the daytime.