In the quest for new functional materials, Mn²⁺-activated metal halide perovskites (MHPs) were found to possess remarkable optical properties. However, they show low photoluminescence quantum yield (PLQY) and weak thermal stability. This is due to weak dopant–host interactions and strong phonon–lattice coupling at high temperatures of MHPs. Developing Mn²⁺-activated MHPs with a high PLQY and good thermal stability has become a highly versatile research area to meet current needs. Herein, we synthesized Mn²⁺ ion-activated Rb₃(Cd_1–xMn_x)₂Cl₇ layered metal halide perovskite (LMHP) and solved its crystal structure using direct methods. The Rb₃(Cd_1–xMn_x)₂Cl₇ LMHP exhibits an orange emission with a high PLQY of 88%, the highest among Mn²⁺-activated MHPs. Moreover, Rb₃(Cd_0.80Mn_0.20)₂Cl₇ exhibits a zero-thermal-quenching (TQ) behavior, which is considered the first for the MHP family. Therefore, our results could pave the way for a search for new LMHPs with zero-TQ behavior for high-power optoelectronic applications.

中文翻译：

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零热淬火层状金属卤化物钙钛矿

在寻求新功能材料的过程中，Mn ²⁺活化金属卤化物钙钛矿（MHPs）被发现具有显着的光学特性。然而，它们显示出低光致发光量子产率（PLQY）和弱热稳定性。这是由于在 MHP 的高温下弱掺杂剂 - 主体相互作用和强声子 - 晶格耦合。开发具有高PLQY和良好热稳定性的Mn ^{2+活化MHP已成为满足当前需求的高度通用的研究领域。}在此，我们合成了 Mn ²⁺离子活化的 Rb ₃ (Cd _{1– x} Mn _x ) ₂ Cl ₇层状金属卤化物钙钛矿（LMHP）并使用直接方法解决了其晶体结构。Rb ₃ (Cd _{1– x} Mn _x ) ₂ Cl ₇ LMHP 呈现橙色发射，PLQY 高达 88%，是 Mn ²⁺活化的 MHP 中最高的。此外，Rb ₃ (Cd _0.80 Mn _0.20 ) ₂ Cl ₇表现出零热淬火 (TQ) 行为，这被认为是 MHP 系列中的第一个。因此，我们的结果可以为寻找具有零 TQ 行为的新型 LMHPs 用于大功率光电应用铺平道路。