无机半导体/无铅钙钛矿双异质结型绿光LED的制备及其发光机制研究

项目名称： 无机半导体/无铅钙钛矿双异质结型绿光LED的制备及其发光机制研究

项目编号： No.11504155

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 张立春

作者单位： 鲁东大学

项目金额： 23万元

中文摘要： 利用红、绿、蓝多芯片LED合成白光可获得较高的显色指数和发光效率，被认为是固体照明技术的未来发展方向。然而，绿光LED的效率问题仍是阻碍其发展和应用的瓶颈。近年来，有机-无机杂化钙钛矿材料因其优良的光学吸收和电荷传导特性而成为新型光伏器件领域的研究热点。此外，该材料还表现出特殊的发光特性，被认为是实现高效发光器件的理想半导体材料。本项目拟采用宽带隙的无铅钙钛矿材料CH3NH3SnX3（X为Br或Cl）作为发光层，并选用无机半导体材料作为载流子注入层，研制具有双异质结结构的钙钛矿型绿光LED；通过优化材料生长参数及器件制备工艺，系统地研究材料界面对钙钛矿LED发光性能的影响；最后，建立合理的异质结能带模型，阐释无机半导体/无铅钙钛矿双异质结型绿光LED载流子输运、复合及发光的微观物理机制。本项目将为研制低成本、高亮度的钙钛矿型绿光LED提供理论依据和技术支持。

中文关键词： 绿光发光二极管；无铅钙钛矿；电致发光；发光机制；辐射复合

英文摘要： Due to the high color rendering index and luminescence efficiency, white light-emitting diodes (LED) combined by red, green, blue multi-chips have been regarded as the trends of solid-state lighting. However, the development of more efficient green LEDs is one of the challenges. Recently, organic-inorganic hybrid perovskite has become the hottest research topic in the new photovoltaic device due to their perfect light absorption and charge transfer optoelectronic properties. In addition, previous works have shown these perovskites possess special photoluminescent properties, making them potential candidates for light-emitting devices with high efficiency. In this project, the perovskite green LEDs with double heterojunction structure will be fabricated using wide-bandgap lead-free perovskite CH3NH3SnX3 (X is Br or Cl) as the emitting layer, and inorganic semiconductors as carrier injection layer. Furthermore, influence of interface on the electroluminescence of perovskite LEDs will be systemically studied by optimizing the growth parameters and device process. Finally, the energy band model of heterojunction will be constructed for illuminating the mechanism of the carrier transport, recombination characteristics and luminescence properties of perovskite LEDs. The results found in this research will provide theoretical basis and technical support for preparing of green LEDs based on lead-free perovskite with low-cost and high brightness.

英文关键词： green light-emitting diodes;lead-free perovskite;electroluminescence;luminescence mechanism;radiative recombination