Broadband white-light emission in metal halides has been intensely explored because of their facile solution processability, structural adjustability, and high color rendering index. However, the most reported quantum yields for white-light emission remain low despite great efforts. Herein, we report a metal-halide layered perovskite, (HOOC₄H₉NH₃)₂PbBr₄, showing the typical white-light emission with a highly enhanced quantum yield up to 21.2% compared to previously reported noncarboxyl layered hybrid perovskites (0.5–9%). Notably, mechanistic studies reveal that the distinctive carboxylic acid dimers largely increase the structure rigidity and in consequence reduce the nonradiative recombination induced by stretching vibration. To the best of our knowledge, this strategy is important in hybrid perovskites, which is effective and propagable to acquire prominent photoluminescence. This work will shed light on the design of highly emissive white-light materials involving intense intermolecular interaction and promote their potential in displaying application.

金属卤化物中的宽带白光发射由于其易于溶液加工、结构可调和高显色指数而得到了广泛的研究。然而，尽管付出了巨大的努力，但报告最多的白光发射量子产率仍然很低。在此，我们报告了一种金属卤化物层状钙钛矿，(HOOC ₄ H ₉ NH ₃ ) ₂ PbBr ₄，与之前报道的非羧基层状杂化钙钛矿（0.5-9%）相比，典型的白光发射具有高达 21.2% 的高度增强的量子产率。值得注意的是，机理研究表明，独特的羧酸二聚体在很大程度上增加了结构刚度，从而减少了由伸缩振动引起的非辐射复合。据我们所知，这种策略在混合钙钛矿中很重要，它有效且可传播以获得显着的光致发光。这项工作将阐明涉及强烈分子间相互作用的高发射白光材料的设计，并促进其在显示应用中的潜力。