Temperature-dependent upconversion luminescence in ferroelectric 1.5% Pr/3%Yb:0.75Pb(Mg1/3Nb2/3)O-3-0.25PbTiO(3) transparent ceramics for non-contact thermometry and optical heating

摘要

Non-contact optical thermometry based upon fluorescence intensity ratio (FIR) has attracted much attention because of its excellent accuracy and sensitivity. Recently we reported the upconversion luminescence in Pr3+/Yb3+ co-doped 0.75Pb(Mg1/3Nb2/3)O-3-0.25PbTiO(3) transparent ceramics [Z. Lv a al., Ceramics International 45 (2019) 10924-10929]. In this article we study the temperature dependence of upconversion emissions from the 1.5%Pr/30/0Yb:0.75Pb(Mg1/3Nb2/3)O-3-0.25PbTiO(3) transparent ceramics. The FIR between the D-1(2)-H-3(4) and (PO-H4)-P-3-H-3 emissions fits a thermally coupled-levels-like equation, and exhibits the maximum relative sensitivity of 1.03% K-1 at the temperature 320 K. Meanwhile, the FIRs of I-Red/I-Green,I-Red/I-Blue and I-Red/I-BG show linear responses versus temperature and illustrate the high constant sensitivities of 1.09%-2.9% K-1, but in a narrow temperature range of 140-240 K. The multiple temperature-sensing performances offer us chances to select distinct response functions on the basis of the practical demands. In addition, laser induced heating was observed in the transparent ceramics. The generated temperature in the ceramics can be accurately monitored and regulated from 329 to 377 K by changing the excitation power from 1.58 to 8.61 W/cm(2). The high heating efficiency of -6.83 K cm(2)/W makes the transparent ceramics suitable for optical heater. The transparent ceramics exhibit excellent piezoelectric and ferroelectric performances, and thus they are promising candidates for multifunctional optical-electro devices besides non-contact thermometer and optical heater.