Highly Efficient and Stable Perovskite Light Emitting Devices

The unique properties of metal halide perovskite make them promising for novel light emitting devices. In this project, I will combine material research and device design to develop highly efficient and stable perovskite light emitting devices and explore corresponding device geometries amenable to thin-film lasers on arbitrary surfaces. I propose a multilayer thin-film light-emitting transistor device in which the carrier concentration of electrons and holes can be independently controlled by two separate gates. For the light-emitting layer, I will fabricate quantum-confined metal halide perovskite materials with high photoluminescence quantum efficiency (PLQE), good charge transport as well as good intrinsic stability, focusing on cesium and formamidinium based quasi two-dimensional perovskite films or perovskite quantum dots. The charge transport layers that transport the electrons and holes to the perovskite layer will be transparent for the emitted light and have high charge carrier mobility, by use of transparent oxide semiconductors for the electrons and organic semiconductors for the holes. This project contains fundamental science as well as applied research useful to many future sensor and display applications.