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Novel transparent glass‐ceramics containing Ag@NaGdF4:Er3+ core‐shell nanocrystals were fabricated successfully by a melt‐quenching method and subsequent heating. X‐ray diffraction and transmission electron microscope images show that precious metal Ag is successfully encapsulated by the NaGdF4:Er3+ nanoparticles to form an Ag@NaGdF4:Er3+ core‐shell structure in glass matrix. Compared with the NaGdF...
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