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Novel Ho 3+ doped highly transparent NaYbF 4 glass‐ceramics were successfully fabricated by melt‐quenching technique. Their structural and luminescent properties were systemically investigated by XRD , TEM , absorption spectra, upconversion spectra, and lifetime measurements. Excited by 980‐nm laser, samples exhibit characteristic emissions of Ho 3+ . Impressively, the luminescent color can be tuned easily from red for precursor glass to green for glass‐ceramics. Such novel phenomenon was elaborately investigated and is owing to the reduced multiphonon nonradiative relaxation and enhanced cross‐relaxation of Ho 3+ in NaYbF 4 nanocrystals after crystallization. Our results indicate that NaYbF 4 transparent glass‐ceramics is an excellent host for upconversion.
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Wei et al. (2013) studied this question.
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