Publication date: 15th December 2025
As a novel light source technology, perovskite light-emitting diodes (PeLEDs) have achieved external quantum efficiencies comparable to OLEDs, and with superior colour space coverage. In this talk, we discuss some key considerations behind the high efficiencies and the potential mechanisms that may approach or exceed the efficiency limits. We focus on the critical challenges in this field, including device instability, brightness and downscaling. We have demonstrated, for the first time, that ultralong operational lifetimes satisfying the practical demands can be achieved in perovskite LEDs. We show that it is possible to control the p- and n-type behaviours in emissive perovskite semiconductors, enabling ultra-high brightness of 1.16 million nits in perovskite LEDs, setting a brightness record for solution-processed LEDs. Our efforts of downscaling micro- and nano-perovskite LEDs to below the size limit of conventional LEDs are presented, showcasing the potential of micro/nano-PeLEDs for next-generation display technologies. Finally, we present our results on the first electrically-driven perovskite laser and its potential as a new semiconductor laser technology.
