Temperature dependence of upconversion luminescence and sensing sensitivity of Ho3+/Yb3+ modified PSN-PMN-PT crystals

In view of the vital role of temperature in actural applications of materials, a detailed investigation was conducted for Ho3+/Yb3+-modified Pb(Sc1/2Nb1/2)O-3-Pb(Mg1/3Nb2/3)O-3-PbTiO3 (PSN-PMN-PT) crystals focusing on their temperature dependence of upconversion luminescence and sensing abilities. The results indicated that the luminescence intensity of grown crystals weakened with elevating temperature, and the fastest decrease rate occurred in green emission. The absolute and relative sensitivities calculated by S-755/S-767 (S(A2 )and S-R2) were higher than that based on I-665/I-554 (S-A1 and S-R1) at low temperature, and the maximum of 0.0112 K-1 and 0.0373 K-1 were obtained at 93 K, comparable to that of some rare earth (RE) doped host materials reported. The study on chromaticity coordinate revealed the high colour purity of crystals, nearly up to 99%. Furthermore, the decay dynamics of crystals were investigated. The longest average decay time (157.44 mu s) of 554 nm emission was obtained at 293 K. These results manifest the promising applications of Ho3+/Yb3+ -modified PSN-PMN-PT crystals as luminescent and optical thermometric materials at low and room temperature. It is also of significance for further investigation of photoelectric coupling performance of ferroelectric crystals.(1) (C) 2019 Elsevier B.V. All rights reserved.