Optical Temperature Sensor Based on Er3+/Yb3+‐Codoped Perovskite BaZrO3

ABSTRACTThe Er3+/Yb3+‐codoped perovskite BaZrO3 (BaZrO3:Er3+, Yb3+) phosphor was synthesized via a simple, rapid, and cost‐effective pyrolysis reaction. The perovskite crystals BaZrO3:Er3+, Yb3+ have a Goldschmidt tolerance factor of 0.9–1 and belong to the cubic crystal system. BaZrO3:Er3+ emits strong green luminescence when excited by a 980‐nm laser. The addition of Yb3+ can tune the emission color of BaZrO3:Er3+ from green to yellow and red. BaZrO3:Er3+, Yb3+ was investigated as temperature probes for optical temperature sensors. The performance of the temperature sensor was evaluated over the temperature range of 293–473 K. Using the fluorescence intensity ratio (FIR) technique based on the thermally coupled levels (TCLs) of the two emission bands (2H11/2 → 4I15/2, 4S3/2 → 4I15/2), the maximum relative sensitivity of the sensor was 1.03 × 10−2 K−1 at 293 K.