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Bulk and nanoscale powders of YAG:Re (Re=Ce, Pr, Tb) were synthesized by solid-state and sol–gel method. The changes of spectra and energy level were studied. Compared with the bulk YAG:Re (Re=Ce, Pr, Tb) crystals, the lattice parameter of YAG:Re (Re=Ce, Pr, Tb) nanocrystals decreases. It is also found that the excitation peaks of 5d energy levels shift in nanocrystals. The physical reason for spectral...
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