Developing highly sensitive optical thermometers is of great significance due to their capability to enable remote and non-contact temperature measurements, rendering them highly applicable in diverse and harsh environments. Herein we report a temperature-dependent phosphor of 0D metal halide hybrid by incorporating Bi³⁺ into the (MePPh₃)₂ZnCl₄ matrix. Through Bi³⁺ doping, the initially non-luminescent (MePPh₃)₂ZnCl₄ matrix exhibits a deep-blue emission centered at 453 nm, with a photoluminescence quantum yield (PLQY) of 5.71% and a Stokes shift of 75 nm at room temperature. Experimental characterization demonstrates that exciton-like luminescence of Bi³⁺ is mainly responsible for the blue emission. Single crystals of Bi³⁺-doped (MePPh₃)₂ZnCl₄ show an unusual correlation between photoluminescence (PL) lifetime and temperature. Particularly, the dependence of luminescence lifetime on temperature is most remarkable in the temperature range of 80 to 100 K with an exceptional sensitivity up to 0.09 K⁻¹, representing one of the best levels for thermometry based on PL decay lifetime. Our work not only provides a viable strategy for designing a novel, environmentally friendly, and stable blue emitter, but also paves the way for precise thermometric application at low temperature.

开发高灵敏度光学测温仪具有重要意义，因为它能够实现远程、非接触式温度测量，使其非常适用于各种恶劣的环境。在此，我们通过将 Bi ³⁺ 掺入 (MePPh ₃ ) ₂ ZnCl ₄ 中，报道了一种 0D 金属卤化物杂化物的温度依赖性荧光粉矩阵。通过 Bi ³⁺ 掺杂，最初不发光的 (MePPh ₃ ) ₂ ZnCl ₄ 基体呈现出以453 nm，室温下光致发光量子产率（PLQY）为5.71%，斯托克斯位移为75 nm。实验表征表明，Bi ³⁺ 的类激子发光是蓝色发射的主要原因。 Bi ³⁺ 掺杂单晶 (MePPh ₃ ) ₂ ZnCl ₄ 在光致发光 (PL) 寿命和温度之间表现出不寻常的相关性。特别是，发光寿命对温度的依赖性在 80 至 100 K 的温度范围内最为显着，灵敏度高达 0.09 K ⁻¹ ，代表了基于 PL 衰变寿命的测温的最佳水平之一。我们的工作不仅为设计新型、环保且稳定的蓝色发射器提供了可行的策略，而且为低温下精确测温应用铺平了道路。