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Synergistic Enhancement of Blue Emission in Sb 3+ /Cl − Co‐Doped CsPbBr 3 Nanocrystals for High‐Performance Light‐Emitting Diode Applications

Year: 2025

Type: article

Abstract: Metal halide perovskites (MHPs) have emerged as promising candidates for optoelectronic applications, attributed to their remarkable optical and electrical properties. However, achieving stable and efficient blue emission from MHPs remains a significant challenge due to inherent defects, nonradiative recombination, and phase instability. In this study, a co‐doping strategy that integrates Sb 3+ and Cl − into CsPbBr 3 nanocrystals (NCs) under ambient conditions is presented, yielding blue‐emitting CsPbBr 3 :SbCl 3 NCs with a high photoluminescence quantum yield (PLQY) of 95.9% at 466 nm. Structural and spectroscopic analyses reveal that the introduction of Cl − not only increases the bandgap of NC, leading to a blue‐shifted emission, but also modulates the rigidity of PbX 6 4− octahedra, thereby facilitating the substitution of Sb 3+ for Pb 2+ . Meanwhile, Sb 3+ doping effectively suppresses Auger recombination and mitigates surface defects. The co‐doped NCs exhibit remarkable stability, maintaining over 80% of their PL intensity after prolonged exposure to elevated temperatures, as well as over 90% in aqueous environments or under ultraviolet irradiation. Density functional theory results further indicate a lower binding energy for the co‐doped NCs, suggesting enhanced lattice stability. Furthermore, a pure‐blue light‐emitting diode incorporating these NCs demonstrates stable luminescence performance under varying driving currents.

Source: Advanced Optical Materials

DOI: 10.1002/adom.202502679