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Optical characteristics and upconversion dynamics of Er3+ in Er3+/Yb3+:LiLa(MoO4)2 crystals were investigated. The absorption spectra, fluorescence spectra and the fluorescence decay curves were analyzed at room temperature. The infrared emission at 1538 nm and visible emissions at 520–569 and 640–670 nm, corresponding to 2H11/2,4S3/2→4I15/2 and 4F9/2→4I15/2 transitions of Er3+ ions, were simultaneously observed in Er3+/Yb3+:LiLa(MoO4)2 crystals under 976 nm excitation at room temperature. The maximal emission cross-section near 1530 nm for π-polarization was 0.63×10–20 cm2 and the measured lifetime of 4I13/2 was 4.88 ms. The upconversion process was involved in sequential two-phonon processes, either the energy transfer from Yb3+ ions or by the excited state absorption.
The absorption spectra, fluorescence spectra and the fluorescence decay curves were analyzed at room temperature. The infrared emission at 1538 nm and the visible emissions at 520- 569 and 640-670 nm, corresponding to 2H11 / 2,4S3 / 2 → 4I15 / 2 and 4F9 / 2 → 4I15 / 2 transitions of Er3 + ions were observed simultaneously in Er3 + / Yb3 +: LiLa (MoO4) 2 crystals at 976 nm excitation at room temperature. The maximal emission cross-section near 1530 nm for π-polarization was 0.63 × 10-20 cm2 and the measured lifetime of 4I13 / 2 was 4.88 ms. The upconversion process was involved in sequential two-phonon processes, either the energy transfer from Yb3 + ions or by the excited state absorption.