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Cubic-to-hexagonal phase transformation and enhancement of upconversion emission are simultaneously achieved by modifying the ratio of ZnO/Na2O content in the Tb3+-Yb3+ co-doped oxyflouride Zincatesilion glass ceramics containing NaYF4 nanocrystals. XRD and TEM data have revealed through the crystallization of NaYF4 from ¨» phase to ¦Â phase. Additionally, upconversion emissions were obtained from these Tb3+-Yb3+ glass ceramics under 980 nm excitation. Compared with the cubic ¨»-NaYF4 nanocrystals of glass ceramics, the upconversion intensity augmented drastically due to the occurrence of phase transformation from the cubic NaYF4 to the hexagonal one. Therefore, the PL results showed that the cubic-to-hexagonal the NaYF4:Eu3+ lattice could induce a remarkable change of the PL intensity in red region (R=IED/IMD) with 393 nm excitation wavelength. It was indicated that it changed the phase transformation in Tb-Yb on symmetry of the lattice.

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fjtony163: ½ð±Ò+1, ¹ÄÀøÓ¦Öú 2016-03-28 09:55:50
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1. XRD and TEM data have revealed£¨£© through the crystallization of NaYF4 from ¨» phase to ¦Â phase
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2.Compared with£¨ the cubic ¨»-NaYF4 nanocrystals of glass ceramics£©, £¨the upconversion intensity£© augmented drastically due to the occurrence of phase transformation from the cubic NaYF4 to the hexagonal one
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