Infrared-to-visible upconversion emission of Er3+/Yb3+-codoped SrMoO4 phosphors as wide-range temperature sensor

Er3+/Yb3+-codoped SrMoO4 phosphors were prepared by a high-temperature solid-state reaction method. At room temperature, all the as-prepared samples exhibited strong upconversion properties and the emission intensity increased dramatically with the increase of Yb3+ ion concentration, reaching its maximumvalue when the concentration was 5 mol%. The dependence of emission intensity on the pump power suggested that the upconversion emission was a two-photon process. Furthermore, the optical temperature sensing properties based on green upconversion emissions of the SrMoO4:0.01Er(3+)/0.05Yb(3+) phosphor were studied. It is found that the SrMoO4: 0.01Er(3+)/0.05Yb(3+) phosphor can be operated over a very wide temperature range of 93-773 K with a maximum sensitivity of similar to 0.0128 K 1, indicating that low- and high-temperature thermometry can be simultaneously realized in this phosphor. (C) 2015 Elsevier B.V. All rights reserved.