三基色量子点的制备与白光的实现  

PREPARATION OF TRICHROMATIC QUANTUM DOTS:SOURCE OF WHITE LIGHT

作　　者：乐阳[1] 葛美英[1] 孙艳[1] 陈鑫[1] 戴宁[1] 

机构地区：[1]中国科学院上海技术物理研究所红外物理国家重点实验室,上海200083

出　　处：《红外与毫米波学报》2010年第6期427-430,共4页Journal of Infrared and Millimeter Waves

基　　金：国家重点基础研究发展计划(2010CB933700);上海市纳米专项(0752nm016)

摘　　要：采用化学溶液方法,以乙基黄原酸盐作为壳层前驱体,制备了红绿蓝三色发光的CdSe/ZnS核壳量子点.以乙基黄原酸锌为前驱体形成ZnS壳层包覆CdSe核量子点,通过调节反应温度与反应气氛等条件获得了发绿光(542nm)及蓝光(483nm)的核壳量子点.以乙基黄原酸镉和乙基黄原酸锌分别作为壳层CdS及ZnS的前驱体制备了发红光(612nm)CdSe/CdS/ZnS核/多壳结构量子点.紫外-可见吸收光谱、荧光光谱及透射电镜研究结果表明,通过条件调节,温度较低时(约230℃)注入乙基黄原酸锌后量子点发光峰出现红移,而温度较高时(约260℃)则发生蓝移.通过不同发光颜色的量子点的混合实现了三基色白光.Based on chemical solution-process method,red,green,and blue-luminescent CdSe/ZnS semiconductor core/shell quantum dots were successfully prepared by utilizing ethylxanthates as precursors of shell layers.Green-luminescent（542nm） and blue-luminescent（483nm） core/shell quantum dots were synthesized by capping the CdSe core quantum dots with ZnS shell layers from zinc ethylxanthate precursors and manipulating reaction temperature with the presence of oxygen.The red color（612nm） CdSe/CdS/ZnS core/multishelled quantum dots were prepared by capping of CdS and ZnS shell layers from cadmium ethylxanthate and zinc ethylxanthate precursors.Results from UV-vis absorption spectra,photoluminescence spectra and transmission electron microscopy（TEM） indicated that the emission red-shifted if the ZnS capping of CdSe dots is processed at a lower temperature（about 230 ℃）,while blue-shifted at a higher temperature（about 260 ℃）.Trichromatic white light was obtained via mixing of red,green,and blue-luminescent quantum dots.

关 键 词：硒化镉 半导体量子点 核壳纳米结构 白光LED 

分 类 号：TN312.8[电子电信—物理电子学]