Abstract
The effects of substitution of Al3+ and Ga3+ ions on the upconversion luminescence of (Lu,M)NbO4:Yb3+,Er3+ (M: Al3+, Ga3+) were studied for the first time. Under infrared (980nm) radiation, the upconversion spectra consisted of strong green and weak red emission bands, which were assigned to the transition of the 2H11/2/4S3/2 and 4F9/2 levels, respectively, to the ground state (4I15/2) of the Er3+ ions through an energy transfer process from Yb3+ to Er3+. A two-photon upconversion process was involved in the upconversion emission of (Lu,M)NbO4:Yb3+,Er3+. Substitution of Al3+ and Ga3+ ions increased the green (red) emission intensity to approximately 120% (120%) and 135% (130%), respectively. These behaviors were explained in terms of the crystal field asymmetry and energy transfer probability.
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