Abstract
The upconversion properties of Tm3+ and Yb3+ codoped CaSc2O4 phosphor excited at 980 nm are reported. The blue emission of Tm3+:1G4 → 3H6, red emission of Tm3+:1G4 → 3F4, near-infrared emissions of Tm3+:3H4 → 3H6 (800 nm) and 3F4 → 3H6 (1600 nm) are observed when excited Yb3+:2F5/2 level. The spectral properties of Yb3+:2F5/2 and Tm3+:3F4, 3H4, 1G4 levels are described in detail as a function of Yb3+ and Tm3+ concentrations. By the trends of intensity ratios of Tm3+:3F4 to Yb3+:2F5/2 and Tm3+:1G4 to 3H4 with the doped concentrations, upconversion dynamics is analyzed in Tm3+ and Yb3+ codoped CaSc2O4 material. The concentration dependent lifetimes of Yb3+:2F5/2 and Tm3+:1G4, 3H4 levels measured prove the existence of the efficient Yb3+ → Tm3+ energy transfer and followed Tm3+ → Yb3+ back-energy transfer processes, respectively. The energy transfer efficiency is up to 70% before concentration quenching occurrence. The back-energy transfer process is evidenced by the presence of the Yb3+:2F5/2 → 2F7/2 in the emission spectrum excited Tm3+:1G4 level at 466 nm. The detailed spectroscopic study conduces to understand the upconversion dynamics process in Tm3+ and Yb3+ codoped excellent CaSc2O4 oxide material.
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