Approaching high-performance light-emitting devices upon perovskite quantum dots: Advances and prospects

Metal halide perovskite quantum dots (PQDs) possess high photoluminescence quantum yields, tunable emission spectra with high color purity, high defect tolerance and facile preparation processing, which are demonstrated as promising electroluminescent emitters in light-emitting diodes (LEDs) for next-generation displays and solid-state lighting applications. With tremendous efforts devoted to improving the luminescent properties of PQDs along with optimizing the device operation of relevant LEDs, prominent breakthroughs are accomplished in boosting the device efficiency of PQD-LEDs that the PQD-LEDs with maximum external quantum efficiencies of over 23% are achieved for green and red PQD-LED devices. However, the further development of light-emitting devices upon PQDs is confronted with significant challenges, which places severe limitations on their practical application in displays and lighting technologies. Herein, this review aims to provide a comprehensive discussion of recent advances towards high-performance PQD-LEDs, including the progress in preparation modification, surface engineering and composition regulation of PQDs, as well as the device architecture optimization of PQD-LEDs. Furthermore, an in-depth discussion of the remaining challenges faced by PQDs and PQD-LEDs is proposed, accompanied by the presentation of potential corresponding countermeasures and future development prospects.