甲基铵铅卤钙钛矿太阳能电池由于高的光电转化效率（超过20%）成为国际上的研究热点。然而，这种钙钛矿材料还具有高的荧光量子效率（70%），以及同时具备可溶液法制备薄膜、光谱可调谐和高的稳定性（兼具有机、无机材料的优点），因此也是用来制备发光二极管的理想材料！然而，目前已报道的钙钛矿发光二极管效率低下，主要面临几个关键问题：（1）器件中载流子辐射复合效率低；（2）载流子有效注入差；（3）在外场作用下载流子辐射弛豫过程机理不清等原因。. 项目围绕着钙钛矿发光二极管的三个关键问题展开。首先，通过界面势垒修饰，设计一种巧妙的“双势垒单势阱”结构，利用隧穿效应，同时实现器件中载流子在钙钛矿材料中的有效区域注入，以及利用势阱结构提高载流子浓度从而提高其辐射复合速率，一举两得；其次，利用瞬态及稳态光谱的方法研究并揭示电场偏置情况下载流子复合动力学过程及其规律。最终，实现一种高效率钙钛矿发光二极管.

The solar cells based on Perovskite have attracted more attentions recently, because the high efficiency as over 20% was achieved. Beyond this, the higher PLYQ of Perovskite was demonstrated as 70%, and more important, the solution-processed film, tuning emission and stability of perovskite were also shown. As the result, light-emitting diodes based on perovskite were also expected. In fact, however, the leak current, lower bimolecule recombination efficiency and the unknown decay dynamic of carriers were responsible for the lower efficiency of perovskite light-emitting diodes (PeLED).. As the results, we aim to solve these problems for PeLED with higher efficiency. Firstly, we achieve the efficient injection of carriers and avoid leaky current of PeLED by interface tunnel engineering; then to construct the potential well to confine the carriers for their high density, which will be good to the higher bimolecule recombination; the last, we disclose the carrier decay dynamic of perovskite under the external electric field. Finally, we achieve the PeLED with high efficiency.