Thermochromic luminescent materials (TLMs) with spectral responsiveness to thermal stimuli have received broad attention due to the forefront applications in temperature visualization and sensing technologies. Herein, a phase diagram‐driven strategy for designing TLMs in Cs–Cd–Br ternary system is presented. The room temperature stable Cs7Cd3Br13 crystal is first obtained by utilizing a facile hydrothermal method, and the self‐trapped exciton (STE) luminescence is improved by breaking local symmetry via Mg2+ doping. Then thermochromic luminescence is further realized in Mn2+ co‐doped Cs7Cd3Br13 on the basis of reversible structural transition to metastable Cs2CdBr4 under thermal stimuli. The emission color change from bright yellow to green benefits from the variation of crystal fields around Mn2+, which can be switched by heating and cooling circulations. Finally, the resulting material is used as a demo to visualize the temperature of a homemade high‐frequency induction heating sintering platform.

中文翻译：

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筛选用于温度可视化应用的 Cs-Cd-Br 三元相图中的热致变色发光材料

由于在温度可视化和传感技术中的前沿应用，对热刺激具有光谱响应性的热致变色发光材料（TLM）受到了广泛的关注。本文提出了一种相图驱动的 Cs-Cd-Br 三元体系 TLM 设计策略。室温稳定Cs7光盘3溴13首先利用简单的水热方法获得晶体，并通过 Mg 打破局部对称性来改善自陷激子（STE）发光2+兴奋剂。然后进一步在Mn中实现热致变色发光2+共掺杂Cs7光盘3溴13基于向亚稳态 Cs 的可逆结构转变2溴化镉4在热刺激下。发射颜色从亮黄色变为绿色得益于 Mn 周围晶体场的变化2+，可通过加热和冷却循环进行切换。最后，所得材料用作演示，以可视化自制高频感应加热烧结平台的温度。