玻璃基多层功能薄膜制备及其倒置量子点LED电致发光机理研究

Quantum dot light-emitting diode (QD-LED) has high value in commercial application. Rapid preparation of highly efficient and environmental friendly QD-LED with low cost is significant for the development of semiconductor lighting technology and related industry. This project intends to combine superior optical properties of quantum dots (QDs)with glass-based multilayer functional films to develop a new type of QD-LED device. The research works are listed as follows: 1) based on lattice matching principle, works will be done on controllable synthesis of environmental friendly and high light-efficiency multilayer core-shell semiconductor QDs by hot-injection method and epitaxy self-assemble method. Synthesis principle, nucleation and growth mechanism of such QDs will be studied. 2) ITO glass-based multilayer functional films will be prepared by spin-coating. Electrons and holes transfer process and recombination process within QDs will be investigated. Also, a novel glass-based inverted QD-LED model will be established. 3) Microstructure, composition and physical property of the interface between glass and inorganic electron transfer layer and the interfaces between other films will be characterized and investigated. Combining Young theory, this research will investigate the relationship between properties of interfaces and carrier transmission, recombination as well as luminescence property. Electroluminescence mechanism of glass-based inverted QD-LED will be studied based on Förster energy transfer principle and donor-acceptor pair recombination luminescence theory. This project serves as a driving force for the broaden of glass application, fabrication of multilayer functional films, and fabrication of novel stable high luminescence QD-LEDs.

量子点发光二极管（QD-LED）具有重要的商业应用价值。快速制备环保、低成本、高效发光玻璃基QD-LED器件，对于半导体照明技术与玻璃产业发展意义重大。研究内容包括：1）通过热注入及外延自组装法，依据核壳结构晶格匹配原理，研究量子点成核与生长过程，设计优化及可控合成I-III-VI族绿色、高光效多层核壳结构量子点，明确其合成机制；2）采用蒸镀+旋涂法制备ITO玻璃基多层功能薄膜，探明电子、空穴传输及其在量子点中的复合过程，构建新型倒置QD-LED模型；3）表征与分析玻璃与无机电子传输层之间及其它多层薄膜间界面结构、成分及物理性质，结合Young等理论探索界面性质对载流子传输、复合及器件发光性能影响，应用Förster能量传递及施主-受主对等复合发光理论，揭示玻璃基倒置QD-LED器件电致发光机理。项目对拓展玻璃应用领域，促进多层功能薄膜制备技术，构建新型QD-LED器件具有重要推动作用。

量子点发光二极管（QD-LED）具有重要的商业应用价值。快速制备环保、低成本、高效发光QD-LED器件，对于半导体照明技术与产业发展意义重大。本项目将量子点优异的光学性质和玻璃基多层功能薄膜器件结合起来，开发了新型QD-LED器件，完成了计划中的研究内容：1）通过热注入及外延自组装法，依据核壳结构晶格匹配原理，研究了量子点成核与生长过程，设计优化并可控合成了CuInS2/ZnS多层核壳结构量子点，明确了其合成机制；2）采用旋涂法及喷墨打印方法，制备了ITO、FTO玻璃基多层功能薄膜，探明了电子、空穴传输及其在量子点中的复合过程，构建了新型倒置QD-LED模型；3）表征与分析了玻璃与无机电子传输层TiO2、ZnO之间及其它多层薄膜间界面结构、成分及物理性质，探索了界面性质对载流子传输、复合及器件发光性能影响，揭示了玻璃基倒置QD-LED器件电致发光机理。本项目对拓展玻璃应用领域，促进多层功能薄膜材料制备技术，构建新型QD-LED器件具有重要推动作用。.项目执行期间，共发表学术论文24篇（其中，SCI收录论文22篇，中文期刊论文2篇），申请中国发明专利9项（其中，授权发明专利5项）；14人次参加了国内外相关学术会议6次，并有10人次受邀请作了会议口头报告；培养了相关研究方向博士毕业生2人，硕士毕业生3人，目前还有在读博士生1人，在读硕士生1人。