碲镉汞量子点的离子交换能带调控及其近红外自吸收性质  

The band gap regulation of Hg_(x)Cd_(1-x)Te quantum dots by ion exchange and their near-infrared self-absorption characteristics

作　　者：房诗玉 刘振宇 金佳杰 史继超 房永征 孙常鸿[2] 叶振华[2] 刘玉峰 FANG Shi-Yu;LIU Zhen-Yu;JIN Jia-Jie;SHI Ji-Chao;FANG Yong-Zheng;SUN Chang-Hong;YE Zhen-Hua;LIU Yu-Feng(School of Materials Science and Engineering,Shanghai Institute of Technology,Shanghai 201418,China;Key Laboratory of Infrared Imaging Materials and Devices,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China)

机构地区：[1]上海应用技术大学材料科学与工程学院,上海201418 [2]中国科学院上海技术物理研究所红外成像材料与器件重点实验室,上海200083

出　　处：《红外与毫米波学报》2022年第2期377-383,共7页Journal of Infrared and Millimeter Waves

基　　金：中国科学院红外成像材料与器件重点实验室开放基金(IIMDKFJJ-19-01);上海市自然科学基金面上项目(20ZR1455400);中国科学院红外成像材料与器件重点实验室开放基金(IIMDKFJJ-19-01);上海市自然科学基金(20ZR1455400)。

摘　　要：通过软化学方法制备单分散的CdTe量子点,调节Hg^(2+)的浓度离子交换实现从可见到近红外光谱准连续可调的碲镉汞(Hg_(x)Cd_(1-x)Te)量子点制备。深入分析了近红外Hg_(0.33)Cd_(0.67)Te量子点的变温光致发光及其自吸收特性,研究结果表明:碲镉汞量子点的荧光强度随着温度的升高(0∼100℃)呈线性降低趋势,谱线展宽,峰位发生红移(12 nm);量子点的吸收和发射光谱部分重叠导致自吸收效应随着量子点的浓度增加而增强,导致量子点荧光强度的降低。In this paper,monodispersed CdTe quantum dots are synthesized by soft chemical method.Meanwhile,mer‐cury cadmium telluride(Hg_(x)Cd_(1-x)Te)quantum dots with the quasi continuous visible to near-infrared spectrum are pre‐pared by ion exchange adjusting the concentration of Hg^(2+).The variable temperature photoluminescence and self-absorp‐tion characteristics of near-infrared Hg_(0.33)Cd_(0.67)Te quantum dots are deeply analyzed.The results indicate that the fluores‐cence intensity of Hg_(x)Cd_(1-x)Te quantum dots decreases linearly with the increase of temperature(0∼100℃).The spectral line broad and the peak position has a red-shift(12 nm).The partial overlap of absorption and emission spectra of quan‐tum dots leads to self-absorption.The increase of self-absorption results in decrease of photoluminescence intensity while the concentration of quantum dots increases.

关 键 词：碲镉汞量子点 离子交换 近红外 自吸收 

分 类 号：O43[机械工程—光学工程]