Inorganic metal halides (IMHs) often suffer from severe fluorescence thermal quenching, limiting their application at elevated temperatures. Therefore, the exploration of IMHs exhibiting antithermal quenching (ATQ) behavior is of great importance. In this study, we developed a green synthetic route using a solvent evaporation method to successfully synthesize the 0D IMHs CsInCl(HO). By precise control over the doping ratios of Sb, Yb, and Er, unique dual-mode emission properties are obtained. As the temperature increases, the compound exhibited downconversion and upconversion luminescence, with relative sensitivity -max values of 7.11% K and 1.21% K, respectively. Particularly anomalous is the compound's manifestation of an unconventional ATQ behavior during the upconversion process. structural analysis confirmed that under high-temperature conditions, the 0D CsInCl(HO) metal halide undergoes structural evolution, transitioning through a CsInCl phase, which is responsible for the ATQ. This study provides experimental evidence for the abnormal ATQ of 0D metal halides, offering new inspiration for the multifunctionalization of 0D metal halides in high-temperature temperature sensing and dual-mode luminescence.
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