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UCL spectra of 0.004Tm3+/0.1Yb3+ codoped CaSc2O4 and Y2O3 pumped by a 980 nm LD with a low pump density of 7 mW/mm2. The emission band near 540 nm (labelled by the asterisk) is from a trace impurity of Ho3+. Inset shows the energy level diagrams and the energy transfer pathways.
Infrared emission spectra of 0.1Yb3+ singly doped (a), and 0.004Tm3+ and 0.1Yb3+ codoped (b) CaSc2O4 and Y2O3 excited by a 980 nm LD.
Decay curves of Yb3+:2F5/2 → 2F7/2 emissions at 1047 nm for the doped CaSc2O4 (a) and Y2O3 (b).
Pump power dependences of emission intensities in CaSc2O4:0.004Tm3+/0.1Yb3+ under a 980 nm LD pump.
Intensities and lifetimes of Yb3+:2F5/2 → 2F7/2 emissions as well as parameters for Yb3+ absorption and Yb3+ → Tm3+ energy transfer in CaSc2O4 and Y2O3.
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