Quasi-2D Perovskites in LEDs

Quasi-2D halide perovskites have been shown to have a great potential for light emitting diodes due to their high photoluminescence quantum yield (PLQY), high color purity and tunable bandgap. They contain a mixture of phases with different dimensionality, which allows efficient energy transfer from larger band gap domains to smaller band gap domains. This unique property gives rise to interesting phenomena in electroluminescence. In addition, the light emission spectrum of halide perovskites can be tuned from blue to red by adjusting the ratio of halide composition. Our research focuses on the applications of quasi-2D perovskites in LEDs.

There is a rapid progress made in perovskite LEDs in recent years. However, the short operational lifetime of perovskite LEDs is still a challenge. To tackle this issue, we study the degradation mechanism of perovskite LEDs by various techniques, including Time-of-Flight Secondary Ion Mass Spectroscopy (TOF-SIMS), transient electroluminescence and admittance spectroscopy. In addition, approaches on improving device performance are also investigated, including solvent engineering, compositional engineering and device engineering.