圆偏振光诱导CdTe量子点再生长及其对光致发光的影响  

Regrowth of CdTe Quantum Dots Induced by Circular Polarized Light and Its Effect on the Photoluminescence

作　　者：鄢波[1,2] 彭泽洋 吕斌[1,2] 刘薇[3] 

机构地区：[1]浙江工业大学理学院,杭州310023 [2]浙江工业大学光学与光电子研究中心,杭州310023 [3]中国科学院上海硅酸盐研究所,上海200050

出　　处：《无机材料学报》2017年第12期1321-1326,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(11604295);浙江省自然科学基金(LQ17C100002);浙江省教育厅基金(Y201329791)~~

摘　　要：实验研究了以3-巯基丙酸为配体合成的水溶性Cd Te量子点经过非偏振光与圆偏振光照射处理后,量子点的再生长变化规律。采用光致发光谱、紫外-可见吸收光谱、透射电子显微镜与X射线衍射等表征手段分析表明:非偏振光会促进Cd Te量子点的光氧化,导致量子点尺寸缩小,荧光发光峰位蓝移,且发光效率降低;而圆偏振光增强了配体的光氧化,在量子点表面形成Cd S层,导致量子点尺寸进一步增大,荧光发光峰红移,且发光效率提升。进一步讨论了Cd Te量子点与配体之间的键合作用,相关光化学反应机制及其对量子点光致发光性质的影响。The water soluble CdTe quantum dots were synthesized in aqueous solution using 3-mercaptopropionic acid as stabilizer reagent. Effects of non-polarized and circular polarized light modification on structural and optical properties of quantum dots were investigated by photoluminescence spectroscope, ultraviolet visible absorption spec- troscope, transmission electron microscope, and X-ray diffraction. It is revealed that the non-polarized light tends to oxidize the quantum dots, which brings about photo degradation of quantum dots and blue shift ofphotoluminescence. By contrast, the circular polarized light oxidizes the stabilizer reagent at the surface of CdTe quantum dots, which leads to regrowth of quantum dots and red shift of photoluminescence. Moreover, the photochemical reaction mecha- nism together with the bonding effect between stabilizer reagent and CdTe quantum dot were studied. The photolu- minescence of CdTe quantum dot is associated with its surface states.

关 键 词：碲化镉 量子点 光致发光 偏振光调制 

分 类 号：O613[理学—无机化学]