Materials Research Bulletin, Vol.86, 228-233, 2017
Up-conversion luminescence properties and thermal effects of LaVO4: Er3+ under 1550 nm excitation
Efficiently up-conversion luminescence can be achieved by replacing the traditional sensitizer Yb3+ ions with Er3+ ions in LaVO4 host under 1550 nm excitation. In contrast to other up-conversion luminescence materials, such as Y2O2S:Er3+, Y2O3:Er3+, YOCl:Er3+, which exhibit red emission, LaVO4:Er3+ samples present an abnormal green emission under 1550 nm excitation. Excited state absorption is the dominating up-conversion luminescence mechanism at low doping concentrations of Era., whereas energy transfer up-conversion predominates at high concentrations of Er3+. Infrared thermal imaging is adopted to investigate the thermal effects of LaVO4:Er3+ sample under 1550 run irradiation. it shows a rapid heating process within 1 similar to 5 s and LaVO4:0.21Er(3+) sample yields a temperature rising of Delta T = 66.46 degrees C under 1550 nm irradiation (207 mW) within 60 s. Therefore, the temperature sensor based on up-conversion luminescence of Er3+ ions (HL11/2)-H-2/S-4(3/2) thermally coupled levels produced significant measurement errors at low temperatures because of the thermal effects and non-uniform temperature of the incident light spot area. (C) 2016 Elsevier Ltd. All rights reserved.