Selecting Doped Er3+/Ho3+/Tm3+ in the Perovskite-Like Material Cs3YF6: Yb3+ to Achieve Ultrasensitive Luminescence Intensity Ratio Temperature Sensing

Luminescence intensity ratio (LIR) thermometry based on distinct up-conversion luminescence centers was established in Cs-based fluorides. By contrasting the nonthermally coupled luminescence intensity of Er 3+ /Ho 3+ /Tm 3+, it is possible to determine which kind of up-conversion emission ion is more suited for the perovskite-like Cs 3 YF 6 material. The best option is Er-doped Cs 3 YF 6 samples with a relative sensitivity ( S r ) of 0.96% K –1, according to a comparison of the LIR fitting findings. However, the extremely high absolute sensitivity ( S a ) in Cs 3 YF 6: Yb, Tm suggests that S a is not trustworthy in the LIR temperature evaluation system according to the temperature resolution δ T . This work provides recommendations for the LIR temperature sensing design for comparable Cs-based fluorides while minimizing time and expense.