Near infra-red luminescence thermometer based on Y3Al5O12: Yb3+, Cr4+

Abstract Research on luminescence thermometers has predominantly centered around visible-light thermometers, susceptible to significant impact from Raleigh scattering (∼ λ −4 ). In this work, a Cr 4+ and Yb 3+ co-doped Y 3 Al 5 O 12 thermometer is reported. Both emission and excitation are in the IR range, which makes this thermometer much less affected by Raleigh scattering compared to traditional visible-light thermometers. The non-overlapping of Yb 3+ and Cr 4+ emissions in the photoluminescence (PL) spectrum is also a major advantage over conventional thermometers. By calculating the PL intensity ratio of Yb 3+ and Cr 4+ as a function of temperature, the maximum relative sensitivity reaches 1.60% K −1 at 200 K. In addition, Cr 4+ and Yb 3+ co-doped Y 3 Al 5 O 12 as a thermometer based on Cr 4+ luminescence lifetime exhibits a relative sensitivity of 0.56% K −1 . This work provides inspiration for the design of transition metal and rare-Earth co-doped dual-mode thermometers.