Optical temperature sensing of Eu3+-doped oxyhalide glasses containing CsPbBr3 perovskite quantum dots

A new strategy for optical thermometer with high sensitivity was developed herein by employing exciton recombination of CsPbBr3 quantum dots as temperature detecting signal and 4f→4f transition Eu3+ ions as reference one. A series of structural and spectroscopic characterizations confirmed that CsPbBr3 perovskite quantum dots were successfully precipitated and Eu3+ doping activators remained in glass matrix. Benefited from their completely different thermal-quenching behaviors, fluorescence intensity ratio of exciton recombination and Eu3+ emission in nanocomposite exhibited excellent temperature sensing property in the temperature ranging from 93 K to 383 K. The maximum absolute and relative temperature sensitivity can reach as high as 0.0224 K-1 and 2.25% K−1, respectively. We believe that this work will exploit an effective pathway for developing innovative non-contact optical thermometric materials. •CsPbBr3 quantum dots and Eu3+ dopants co-doped glasses were prepared.•CsPbBr3 quantum dots were precipitated and Eu3+ activators remained in glass matrix.•Exciton recombination and Eu3+ 4f-4f luminescence can be simultaneously detected.•Highly temperature-sensitive Eu3+/CsPbBr3 fluorescence intensity ratio was achieved.•The investigated nanocomposites may find promising application in optical thermometry.