项目名称： 内部界面缺陷-杂质型双发射量子点及其温度传感应用技术

项目编号： No.61475034

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 无线电电子学、电信技术

项目作者： 王春雷

作者单位： 东南大学

项目金额： 83万元

中文摘要： 本项目提出利用量子点内部界面缺陷构筑一类新型双发射量子点体系即内部界面缺陷-杂质型量子点，并将其用于温度传感。利用杂质与宿主材料界面或核壳界面定位形成稳定的内部缺陷、通过控制缺陷类型与分布方式提高缺陷发光效率，能够避免表面缺陷发光效率低受环境影响严重等缺点，从而使缺陷荧光具有了实用价值。以界面缺陷荧光和杂质荧光形成双重荧光发射，利用两个荧光峰强度比率以及量子点色度的变化进行温度传感。项目将设计制备三种不同结构的内部界面缺陷-杂质型双发射量子点体系，研究界面缺陷荧光增强与抑制技术及机理，分析缺陷类型及其与激子相互作用机制。项目在杂质-宿主材料界面荧光调制方面已取得了重要的前期进展。项目的最终成果对研究界面缺陷形成机理、缺陷-激子相互作用、缺陷类型与能量耗散方式关系等科学问题具有重要价值，也为传感领域提供了一种稳定性强、生物毒性低、生物亲和性强、可利用色度变化进行温度传感的新型量子点荧光探针。

中文关键词： 胶体量子点；双发射；内部界面；缺陷；温度传感

英文摘要： This project wants to prepare quantum dots (QDs) with dual emission originating from defects at QD internal interface and internal impurities. Stable defects were formed at the interface between the impurity and the host material or the interface between the core and the shell. The fluorescence quantum yieald of dual emitting QDs will improve by controlling the type and the distribution of defects. As a result, the great disadvantages of low luminescence and instability for traditional suface defects can be avoided. By using the alteration of QD emission colors and the ratios of two emission peaks, as-prepared QDs can be used for temperature sensing. In this project, we will design and prepare three types of dual emission QDs with different structures, and investigate the techniques and mechanism for improving or suppressing the trap emission of QDs, and following by analysis of the types of defects as well as the interactions between defects and excitons. We have made a great progress in controlling the defect emission at the interface between the impurity and the host material. The final results of this project will be useful for comprehending the defect formation mechanism, the interactions between defects and excitons, the relationship between defects and recombination channels of excitons. As-prepared dual emission QDs will be available in temperature fluorescent sensing due to their strong stability, low toxicity, good biocompatibility, and the ability for ratiometric fluorescence measurements.

英文关键词： quantum dots;dual emission;inside interface;defect;temperature sensing