Dipole-Moment Engineering Suppresses Auger Recombination for Low-Threshold Deep-Red Perovskite ASE

Deep-red perovskite lasers hold great promise for biomedical and optoelectronic applications, yet their performance is hindered by Auger recombination at high carrier densities. This study demonstrates that molecular dipole-moment engineering effectively suppresses Auger recombination in CsPb(I x Br 1– x ) 3 perovskite films. By introducing a passivation molecule with a strong electron-withdrawing group and a large dipole moment, the surface electron cloud is redistributed. This not only passivates defects but also reduces the exciton binding energy and enhances lattice rigidity, thereby weakening both defect-assisted and Auger recombination. Transient absorption spectroscopy confirms an extended Auger lifetime and improved optical gain. As a result, the optimized film achieves low-threshold amplified spontaneous emission at 3.4 μJ cm –2 in the deep-red region. This work highlights dipole-moment manipulation as a potent strategy for developing high-performance, low-threshold perovskite lasers.