项目名称: 核壳结构量子点掺杂玻璃及其光学性能研究
项目编号: No.51202170
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 无机非金属材料学科
项目作者: 刘超
作者单位: 武汉理工大学
项目金额: 25万元
中文摘要: PbS、PbSe量子点掺杂玻璃在近红外波段有重要的应用前景,但量子点表面缺陷降低了量子点荧光效率,制约了相关应用研究进展。本项目借鉴全无机钝化法,通过制备核壳结构来钝化玻璃中量子点的表面缺陷,提高荧光效率。本项目以硅酸盐及氟氧化物玻璃为基体,研究组成对碱土金属硫族化合物及PbS与PbSe饱和掺杂浓度, 以及热处理对PbS及PbSe量子点与碱土金属硫族化合物纳米晶或碱土金属氟化物纳米晶可控依次析晶的影响规律,制备核壳结构量子点纳米晶;利用高分辨透射电镜、电子能量损失谱以及高温原位高分辨透射电镜等技术手段,研究核壳结构纳米晶体核化、生长过程与机理;采用微观结构分析与时间分辨光谱等手段相结合的方式,研究核壳结构中PbS或PbSe量子点的表面缺陷钝化效果、机制及其对量子点光学性能的影响,研发高荧光效率的量子点掺杂玻璃。该研究对量子点掺杂光功能玻璃有重要的现实意义,对多功能微晶玻璃研发也具参考价值。
中文关键词: 玻璃;量子点;核壳结构;光学性能;量子效率
英文摘要: Lead chalcogenide quantum dots doped glasses have important potential applications in the near-infrared wavelength range, but the presence of defects or traps on the surface of quantum dots lowers its quantum efficiency and hinders the research progress. In order to improve the quantum efficiency, this project focuses on the surface passivation of PbS and PbSe quantum dots in glasses, using the all-inorganic passivation method. Based on the silicate and oxyfluoride glasses, current research studies the effects of glass composition on the saturable doping concentrations of alkali-earth chalcogenides and lead chalcogenides. Effects of glass composition and thermal treatment on the controllable, sequential precipitation of lead chalcogenide, alkali-earth chalcogenide or alkali-earth fluoride nanocrystals in the glasses is also emphasized in order to fabricate core/shell structured quantum dots in glasses. High resolution transmission electron microscope, electron energy loss spectroscopy and high temperature in-situ transmission electron microscope will be employed to clarify the nucleation and growth of these core/shell structured quantum dots in glasses. Structural analysis will be combined with optical characterization such as time-resolved photoluminescence spectroscopy, to evaluate the passivation efficiency o
英文关键词: Glass;Quantum dots;core/shell structure;Optical properties;Quantum efficiency