Highly Efficient Sky-Blue Perovskite Light-Emitting Diode Via Suppressing Nonradiative Energy Loss

Metal halide perovskites show significant promise for light-emitting diodes (LEDs) because of superior optoelectronic properties, such as direct band gap, excellent mobilities, and high color purity. Blue perovskite LEDs (PeLEDs), however, still suffer from inferior performance compared with green and nearinfrared counterparts. Here, we report a highly efficient sky-blue PeLED operating with an external quantum efficiency of 13.8% based on a quasi-two-dimensional structure. The outstanding efficiency arises from simultaneously suppressing both triplet and trap-assisted nonradiative energy loss via using a ligand with high-triplet-energy and dual-functional passivation groups. Our work proposes a universal strategy to improve the efficiency of sky-blue PeLEDs.

Automated summary

This study presents a highly efficient sky-blue PeLED based on a quasi-two-dimensional structure with an external quantum efficiency of 13.8%. The high efficiency is achieved by suppressing both triplet and trap-assisted nonradiative energy loss using a ligand with high-triplet-energy and dual-functional passivation groups, proposing a universal strategy to improve the efficiency of sky-blue PeLEDs.