Photoluminescence Enhancement for Efficient Mixed‐Halide Blue Perovskite Light‐Emitting Diodes

• DOI: 10.1002/adom.202202528
• Publication Date: 2023-01-18T07:17:14Z
• Authors: Zhan Chen; Xiao‐Ke Liu; Heyong Wang; Xianjie Liu; Lintao Hou; Feng Gao
• Keywords: Quantum Efficiency; Non-radiative recombination; Blueshift

Abstract The development of highly efficient blue perovskite light‐emitting diodes (PeLEDs) remains a big challenge, requiring more fundamental investigations. In this work, significant photoluminescence enhancement in mixed halide films is demonstrated by using molecule, benzylphosphonic acid, which eventually doubles the external quantum efficiency to 6.3% sky‐blue PeLEDs. achieved forming an oxide‐bonded surface at grain boundaries and suppressing electron–phonon interaction, enhances radiative recombination rate reduces nonradiative rate, respectively. Moreover, severe thermal quenching observed films, can be explained two‐step mechanism involving exciton dissociation interaction. results suggest that enhancing reducing interaction‐induced are crucial for achieving with strong emission or above room temperature.