La0.4Gd1.6Zr2O7:0.1%Pr transparent sintered ceramic - a wide-range luminescence thermometer

Sintered transparent ceramics, presenting extraordinary resistance to thermal shocks, incomparably larger than glasses, glass ceramics, and single crystals, maybe valuable luminescence thermometers especially for high-temperature applications. The literature on that subject is, however, very much limited at present. In this paper, the performance of La0.4Gd1.6Zr2O7:0.1%Pr3+ sintered transparent ceramics as a luminescence thermometer was investigated. Temperature dependence of the intensity ratio of emissions from P-3(0) and D-1(2) levels of the Pr3+ activator was found useful to measure temperature with reasonable relative sensitivity and accuracy over the 15-650 K range - one of the broadest achievable up to date. Time-resolved spectroscopy enabled distinct emissions from D-1(2) and P-3(0) in the red part of the spectrum. This allowed achieving an impressive relative sensitivity of the La0.4Gd1.6Zr2O7:0.1%Pr luminescence thermometer which exceeded 0.81% K-1 at 650 K.