有机相CdTe量子点/铕/聚甲基丙烯酸甲酯复合体系的发光性质  

Luminescent Properties of Organic CdTe Quantum Dots/Europium/Polymethyl Methacrylate Nanocomposite

作　　者：王文[1] 林美娟[1] 沈永鑫[1] 黄丽梅[1] 

机构地区：[1]福建师范大学化学与材料学院,福建省高分子材料重点实验室,福州350007

出　　处：《应用化学》2011年第2期142-148,共7页Chinese Journal of Applied Chemistry

基　　金：福建省纳米重大专项项目(2005HZ01-5)

摘　　要：以十二烷基硫醇为稳定剂,在有机相中合成了平均粒径为4.5 nm的有机相CdTe量子点。以三异丙氧基铕,有机相CdTe量子点为原料,用本体聚合反应得到的聚甲基丙烯酸甲酯作聚合物介质,将量子点与聚合物溶液或稀土铕离子、量子点与聚合物溶液分别通过范德华力或离子配位作用直接复合,分别得到CdTe/聚甲基丙烯酸甲酯和CdTe/铕/聚甲基丙烯酸甲酯。采用红外光谱、紫外光谱、荧光光谱、扫描电子显微镜、透射电子显微镜对其结构进行表征。结果表明,复合得到的CdTe量子点/聚甲基丙烯酸甲酯的溶液或薄膜在紫外到可见光区激发下均能发出很亮的红光,当稀土铕离子同时与量子点直接复合到聚合物中时,聚合物的溶液和薄膜仍可以发出量子点的发光,但其荧光相对强度下降,说明稀土铕离子与CdTe量子点的发光均由于它们之间的相互作用而猝灭。Organic CdTe quantum dots with average size of about 4.5 nm were synthesized in organic solution using dodecanethiol as stabilizing reagent.Nanocomposites of CdTe/polymethyl methacrylate（PMMA） and CdTe/Eu/PMMA were prepared via the van der Waal force interaction or the ionic coordination respectively by mixing organic CdTe quantum dots or triisopropoxyeuropium and organic CdTe quantum dots with PMMA.The resultant nanocomposites were characterized by infrared spectra（IR）,ultraviolet absorption spectra（UV-Vis）,fluorescence spectroscopy（FS）,scanning electron microscope（SEM） and transmission electron microscope（TEM）.The results indicated that CdTe/PMMA emitted strong red light under UV-Vis excitation in solution or in film.However,the CdTe/Eu/PMMA also emitted red light,but with decreased relative intensity than that of CdTe/PMMA.The emission of europium and organic CdTe quantum dots in CdTe/Eu/PMMA quenched because of the interaction between the organic CdTe quantum dots and europium ion.

关 键 词：有机相CdTe量子点 聚甲基丙烯酸甲酯 铕 

分 类 号：O632[理学—高分子化学]