The efficient energy transfer in LaGaGeO:Cr, Yb/Nd and LaGaGeO:Cr, Yb, Nd was investigated in detail. In this phosphor, Cr acts as the energy absorber (250-700 nm) to sensitize Yb/Nd in LaGaGeO. Under excitation at 418 nm, LaGaGeO:Cr, Yb phosphors exhibited a broad emission band in the near-infrared (NIR) region located at 976 nm (LaGaGeO:Cr, Nd at 1056 nm), which was attributed to the F-F transition of the Yb ions (F → I transition of Nd). Moreover, a Nd ion was introduced into LaGaGeO:Cr, Yb. The analysis of excitation spectra and decay time proves that Nd acts as a bridging ion in the system. This can be used as a new strategy to enhance the energy transfer in Cr, Yb co-doped phosphors, and these phosphors have potential applications in NIR spectroscopy regulation.
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