Up-Conversion Luminescence and Optical Temperature Sensing Behaviour of Y2O3:Ho3+, Yb3+ Phosphors

作者：Makumbane, Vhahangwele; Yagoub, Mubarak Y. A.^*; Xia, Zhiguo; Kroon, Robin E.; Swart, Hendrik C.^*

来源：Crystals, 2023, 13(8): 1288.

DOI：10.3390/cryst13081288

• Y2O3:Ho3+, Yb3+ upconversion
• up-conversion energy transfer
• fluorescence intensity ratio
• optical temperature sensing

The up-conversion (UC) and temperature sensing behaviours of Y2O3:Ho3+, Yb(3+ )phosphors were investigated. A series of Y2O3:Ho3+, Yb3+ phosphors were synthesized using a solution combustion method. The cubic structure of the Y2O3 with an Ia3 space group was analysed by using X-ray powder diffraction. Scanning electron microscopy was conducted to study the surface morphologies of the UC phosphors. Under 980 nm excitation, the UC emissions of Ho3+ from the S-5(2) ? I-5(8),F- 5(5) ? I-5(8) and S-5(2) ? I-5(7) transitions were observed, which occurred through UC energy transfer (ET) processes. The Yb3+ ion concentration severely affected the UC emission. The sensing behaviour of the phosphor was investigated through the green (F-5(4), S-5(2 )? I-5(8)) to red (F-5(5) ? I-5(8)) fluorescence intensity ratio (FIR). The maximum absolute and relative sensitivity values of SA = 0.08 K-1 and S-R = 0.64% K-1 were obtained. The results revealed that the prepared Y2O3:Ho3+, Yb(3+ )phosphor is suitable for optical sensing at high temperatures.