Various monovalent cations are employed to construct metal halide perovskites with various structures and functionalities. However, perovskites based on highly polar A-site cations have seldom been reported. Here, a novel hybrid 0D (NH₄)_x(OH₃)_3–xInCl₆ perovskite with highly polar hydronium OH₃⁺ cations is introduced in this study. Upon doping with Sb³⁺, hybrid 0D (NH₄)_x(OH₃)_3–xInCl₆ single crystals exhibited highly efficient broadband yellowish-green (550 nm) and red (630 nm) dual emissions with a PLQY of 86%. The dual emission arises due to Sb³⁺ occupying two sites within the crystal lattice that possess different polarization environments, leading to distinct Stokes shift energies. The study revealed that lattice polarity plays a significant role in the self-trapped exciton emission of Sb³⁺-doped perovskites, contributing up to 25% of the Stokes shift energy for hybrid 0D (NH₄)_x(OH₃)_3–xInCl₆:Sb³⁺ as a secondary source, in addition to the Jahn–Teller deformation. These findings highlight the potential of Sb³⁺-doped perovskites for achieving tunable broadband emission and underscore the importance of lattice polarity in determining the emission properties of perovskite materials.

中文翻译：

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锑掺杂引发的高极性零维杂化铵/水合氢钙钛矿中的自陷激子发射

采用各种单价阳离子来构建具有各种结构和功能的金属卤化物钙钛矿。然而，基于高极性A位阳离子的钙钛矿却鲜有报道。本研究引入了一种具有高极性水合氢OH ₃ ⁺阳离子的新型杂化0D (NH ₄ ) _x (OH ₃ ) _{3– x} InCl ₆钙钛矿。掺杂Sb ³⁺后，杂化0D (NH ₄ ) _x (OH ₃ ) _{3– x} InCl ₆单晶表现出高效的宽带黄绿光(550 nm)和红光(630 nm)双发射，PLQY为86% 。双发射的产生是由于 Sb ³⁺占据晶格内具有不同极化环境的两个位置，导致不同的斯托克斯位移能量。研究表明，晶格极性在 Sb ^{3+掺杂钙钛矿的自陷激子发射中起着重要作用，为混合 0D (NH} ₄ ) _x (OH ₃ ) _{3– x}贡献了高达 25% 的斯托克斯位移能量。除了 Jahn-Teller 变形之外，InCl ₆ :Sb ^{3+作为第二来源。这些发现突出了Sb 3+}掺杂钙钛矿实现可调谐宽带发射的潜力，并强调了晶格极性在确定钙钛矿材料发射特性中的重要性。