Chemical and Structural Engineering of Metal Halide Perovskites for Efficient Light Emitting Diodes

The interest in metal halide perovskites soared in the past few years due to their immense potential in light-harvesting and generations through low-cost, scalable, solution-processed and facile device fabrication techniques. In addition to the prominent photovoltaics research, the light-emitting devices using perovskites shows strong promises with high external quantum efficiencies (>20%). However, there are several fundamental issues that limit the production of device quality materials. For example, polymorphism results in parasitic non-perovskite phase at room temperature, which needs to be activated thermally in order to retain back kinetically stable black phase. Poor moisture susceptibility of volatile organic components is detrimental to stable photonic devices. Ion migration in mixed halide perovskite results in spontaneous phase-segregation, degrading the perovskite structure. The proposed research deals with the novel synthesis of stable and highly luminescent metal halide perovskite nanocrystals, microcrystals and thin films with strategic chemical and structural engineering with a different combination of cations and anions to mitigate above-mentioned issues towards stable and efficient LED devices.