High-efficiency Red Perovskite Light-Emitting Diodes Based On Multiple Quantum Wells

In recent years,organic-inorganic hybrid perovskite materials have received considerable attention due to their excellent optoelectronic properties.The tuneable light emission peak,high carrier mobility,long carrier diffusion length and broad spectrum absorption,which make it has great application prospects in light-emitting diodes and solar cells.With the deepening of research on perovskite materials,multiple quantum wells(MQWs)perovskite materials have been developed for high-efficiency perovksite LEDs(PeLEDs).However,little is known about the impacts of large organic ammonium cations on the properties of MQW films.This thesis mainly uses the multiple quantum well perovskite based on phenylbutylammonium.discusses the influence of the ratio of long-chain amine on the spectral properties,we obtains a film,which exhibit a photoluminescence peak at 664 nm with a quantum efficiency,and studies the multi-quantum well structure and energy transfer process.Furthermore,we deposit MQW perovskites of butylammonium-caesium lead iodides.The comparisons of the two perovskite MQW films demonstrate that the choices of large organic ammonium cations significantly influence the properties of the perovskite MQW films.i.e.,distributions of the quantum-well thicknesses,energy transfer processes and recombination channels of the emissive centers.On this basis,a high efficiency red-light perovskite LED device was finally fabricated by selecting various layers of materials in the device and optimizing the perovskite LED(light emitting diode)device.