CaSnO: Pr phosphor for new application in temperature sensing.

CaSnO: Pr phosphor for new application in temperature sensing was investigated. CaSnO: 0.3%Pr had distorted orthorhombic perovskite structure and Pr occupied Ca sites due to their similar ionic radii. CaSnO: 0.3%Pr had spherical particles with mean size of 0.816 μm. The electric dipole-dipole interaction could explain the concentration quenching mechanism. The chromaticity coordinates were (0.1324, 0.3847), located in greenish-blue region and the average afterglow decay time was 60.2 s for CaSnO: 0.15%Pr, which had potential applications for LED and emergency lighting. CaSnO: 0.3%Pr had the activated energy of 0.380 eV. The maximum relative temperature sensitivity for CaSnO: 0.3%Pr was 7.57% K at 298 K and relative sensitivity was as high as 6722.76/T K, which was better than that of most Pr doped phosphors and had potential application in temperature sensing. Moreover, the possible luminescence and long afterglow mechanisms and thermal quenching process of P level through IVCT state were proposed.