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XRD of the as-synthesized RE doped powders obtained by combustion synthesis: (a) Doped at of ; (b) doped at of ; and (c) codoped with and .
Room-temperature luminescence spectra of the as-synthesized doped powder sample doped with and codoped with and . Excitation wavelength: .
The decay curves of the luminescence signal peaked at for the as-synthesized powder: (a) Samples doped only with ; and (b) sample codoped with and . Excitation wavelength: .
Schematic representation of the energy transfer in the as-synthesized powders, activated with and . The dashed lines indicate cross-relaxation processes.
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