Rare earth (RE) ion doped glass ceramics containing hexagonal nanocrystals with a mean size of 12 nm were fabricated. Using as the structural probe, Stark splitting emissions and the low forced electric dipole transition of revealed the partition of RE ions into low-phonon-energy nanocrystals. Efficient energy transfers from to or were found, and the energy transfer efficiency was evaluated. Under ultraviolet excitation, intense white-light emission was observed in -doped samples owing to resided in crystalline environment, indicating their potential application in white-light-emitting diodes.
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