Strategies for high-performance blue perovskite light-emitting diodes

Perovskite light-emitting diodes (PeLEDs) has progressed rapidly and has bright prospects for next-generation display due to advantages of superior color gamut and high photoluminescence quantum yield (PLQY). Recently, major breakthroughs have been made in the improvements of device performance through additive engineering, ligand engineering and optimization of device architectures. As a results, PeLEDs have recorded an external quantum efficiency (EQE) of up to 30.84% for green emission, 26.3% for red emission and 23.8% for near-infrared emission, respectively. However, the performance of blue PeLEDs is unsatisfactory compared to that of red and green PeLEDs, hindering the application of perovskite devices in full-color displays and solid-state lighting. Therefore, effective strategies to achieve high-performance blue PeLEDs are urgently needed. Here, we introduce various approches with metal doping, additive engineering, ligand engineering and interface engineering for high-performance blue light-emitting devices.