Na5Rb7Sc2(WO4)9: Yb3+, Er3+: Luminescence Properties and Prospects for Non-Contact Thermometry

Upconversion luminescence and temperature measurement performance of Ho3+/Yb3+ and Tm3+/Yb3+ codoped Na5Rb7Sc2(WO4)9 phosphors

“…Note that our previous study devoted to the optical properties of the related Na 5 Rb 7 Sc 2 (WO 4 ) 9 :Er 3+ /Yb 3+ compounds has indicated the promise of using this family in non-contact thermometry. 26 In the case of Na 5 Rb 7 Sc 1.95 Yb 0.02 Er 0.03 (WO 4 ) 9 , the FIR value of the two bands at 515–540 nm and 540–575 nm, caused by the 2 H 11/2 → 4 I 15/2 and 4 S 3/2 → 4 I 15/2 transitions in Er 3+ , was chosen as a temperature dependent characteristic. According to the obtained data, the absolute and relative thermal sensitivities for this tungstate reached high values of 1.12% K −1 and 1.19% K −1 .…”