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

Trigonal solid solutions Na 5 Rb 7 Sc 1.95 Yb 0.05 – x Er x (WO 4 ) 9 ( x = 0.0025–0.0375) and Na 5 Rb 7 Sc 2 – 5 y -Yb 2 y Er 3 y (WO 4 ) 9 ( y = 0.005–0.015) based on ternary tungstate Na 5 Rb 7 Sc 2 (WO 4 ) 9 have been obtained by ceramic technology and their luminescence properties have been studied. Excitation of powders by infrared radiation of the laser module (λ ex = 980 nm, P max = 45 mW/mm 2 ) leads to the appearance of a bright green emission. The highest intensity of the bands at 515–540 nm ( 2 H 11/2 → 4 I 15/2 ), 540–575 nm ( 4 S 3/2 → 4 I 15/2 ), and 645–680 nm ( 4 F 9/2 → 4 I 15/2 ) is observed for sample Na 5 Rb 7 Sc 1.95 Yb 0.02 Er 0.03 (WO 4 ) 9 . For a given composition, the power and temperature dependences of optical characteristics have been studied, a mechanism for energy transfer between optical centers has been proposed, and chromaticity coordinates have been determined. Based on the data obtained, it has been concluded that Na 5 Rb 7 Sc 1.95 Yb 0.02 Er 0.03 (WO 4 ) 9 can be used as a material for non-contact luminescent thermometry.