Effects of crystal structure transformation on cooperative up-conversion luminescence in the Tb3+-Yb3+ co-doped oxyfluoride glass-ceramics

Zhencai Li; Dacheng Zhou; Yong Yang; Peng Ren; Rui Zhu; Tao Han; Jianbei Qiu

doi:10.1016/j.jallcom.2017.10.055

Effects of crystal structure transformation on cooperative up-conversion luminescence in the Tb³⁺-Yb³⁺ co-doped oxyfluoride glass-ceramics

Zhencai Li, Dacheng Zhou, Yong Yang, Peng Ren, Rui Zhu, Tao Han, Jianbei Qiu^*

^*Corresponding author for this work

Research output: Contribution to journal › Journal article › Research › peer-review

16 Citations (Scopus)

Abstract

In this study, Tb³⁺-Yb³⁺ co-doped transparent oxyfluoride glass-ceramics were prepared respectively from melt-quenched glass samples with the molar compositions of 45SiO₂-15Al₂O₃-12Na₂CO₃-21BaF₂-(7-x)LaF₃-xYF₃ (x = 0, 1, 3, 6 and 7). It was found that the crystal structure of the annealed glass-ceramics strongly depended on the ratio of YF₃/LaF₃. X-ray diffraction (XRD) and transmission electron microscopy (TEM) results revealed that the crystal structure transformed from cubic Ba₂LaF₇ phase to cubic intermediate phase and finally to cubic BaYF₅ phase, the BaYF₅ nanocrystal was determined as cubic structure instead of the reported tetragonal structure for the first time via a Rietveld refinement method with TOPAS. In the process of crystal structure transformation, the local symmetry around Tb³⁺ ions was infected by different types of irregularly arranged interstitial F- ions, which further affected the effective phonon energy around Tb³⁺ ions. The high effective phonon energy around Tb³⁺ ions in the intermediate phase could strongly enhance the up-conversion (UC) luminescence intensity, and thus improved the UC luminescence efficiency.

Original language	English
Journal	Journal of Alloys and Compounds
Volume	731
Pages (from-to)	1044-1052
Number of pages	9
ISSN	0925-8388
DOIs	https://doi.org/10.1016/j.jallcom.2017.10.055
Publication status	Published - 15 Jan 2018
Externally published	Yes

Bibliographical note

Funding Information:
This work was supported by the National Natural Science Foundation of China (No. 61565009 , 11664022 , 11774138 ), Society Development Foundation of Yunnan Province ( 2016FA021 ).

Publisher Copyright:
© 2017 Elsevier B.V.

Keywords

Crystal structure transformation
Effective phonon energy
High local symmetry
Intermediate phase
Interstitial F ions
Up-conversion

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@article{e9e04c74df264078a84f159f79dfecf3,

title = "Effects of crystal structure transformation on cooperative up-conversion luminescence in the Tb3+-Yb3+ co-doped oxyfluoride glass-ceramics",

abstract = "In this study, Tb3+-Yb3+ co-doped transparent oxyfluoride glass-ceramics were prepared respectively from melt-quenched glass samples with the molar compositions of 45SiO2-15Al2O3-12Na2CO3-21BaF2-(7-x)LaF3-xYF3 (x = 0, 1, 3, 6 and 7). It was found that the crystal structure of the annealed glass-ceramics strongly depended on the ratio of YF3/LaF3. X-ray diffraction (XRD) and transmission electron microscopy (TEM) results revealed that the crystal structure transformed from cubic Ba2LaF7 phase to cubic intermediate phase and finally to cubic BaYF5 phase, the BaYF5 nanocrystal was determined as cubic structure instead of the reported tetragonal structure for the first time via a Rietveld refinement method with TOPAS. In the process of crystal structure transformation, the local symmetry around Tb3+ ions was infected by different types of irregularly arranged interstitial F- ions, which further affected the effective phonon energy around Tb3+ ions. The high effective phonon energy around Tb3+ ions in the intermediate phase could strongly enhance the up-conversion (UC) luminescence intensity, and thus improved the UC luminescence efficiency.",

keywords = "Crystal structure transformation, Effective phonon energy, High local symmetry, Intermediate phase, Interstitial F ions, Up-conversion",

author = "Zhencai Li and Dacheng Zhou and Yong Yang and Peng Ren and Rui Zhu and Tao Han and Jianbei Qiu",

note = "Funding Information: This work was supported by the National Natural Science Foundation of China (No. 61565009 , 11664022 , 11774138 ), Society Development Foundation of Yunnan Province ( 2016FA021 ). Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

year = "2018",

month = jan,

day = "15",

doi = "10.1016/j.jallcom.2017.10.055",

language = "English",

volume = "731",

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journal = "Journal of Alloys and Compounds",

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TY - JOUR

T1 - Effects of crystal structure transformation on cooperative up-conversion luminescence in the Tb3+-Yb3+ co-doped oxyfluoride glass-ceramics

AU - Li, Zhencai

AU - Zhou, Dacheng

AU - Yang, Yong

AU - Ren, Peng

AU - Zhu, Rui

AU - Han, Tao

AU - Qiu, Jianbei

N1 - Funding Information: This work was supported by the National Natural Science Foundation of China (No. 61565009 , 11664022 , 11774138 ), Society Development Foundation of Yunnan Province ( 2016FA021 ). Publisher Copyright: © 2017 Elsevier B.V.

PY - 2018/1/15

Y1 - 2018/1/15

N2 - In this study, Tb3+-Yb3+ co-doped transparent oxyfluoride glass-ceramics were prepared respectively from melt-quenched glass samples with the molar compositions of 45SiO2-15Al2O3-12Na2CO3-21BaF2-(7-x)LaF3-xYF3 (x = 0, 1, 3, 6 and 7). It was found that the crystal structure of the annealed glass-ceramics strongly depended on the ratio of YF3/LaF3. X-ray diffraction (XRD) and transmission electron microscopy (TEM) results revealed that the crystal structure transformed from cubic Ba2LaF7 phase to cubic intermediate phase and finally to cubic BaYF5 phase, the BaYF5 nanocrystal was determined as cubic structure instead of the reported tetragonal structure for the first time via a Rietveld refinement method with TOPAS. In the process of crystal structure transformation, the local symmetry around Tb3+ ions was infected by different types of irregularly arranged interstitial F- ions, which further affected the effective phonon energy around Tb3+ ions. The high effective phonon energy around Tb3+ ions in the intermediate phase could strongly enhance the up-conversion (UC) luminescence intensity, and thus improved the UC luminescence efficiency.

AB - In this study, Tb3+-Yb3+ co-doped transparent oxyfluoride glass-ceramics were prepared respectively from melt-quenched glass samples with the molar compositions of 45SiO2-15Al2O3-12Na2CO3-21BaF2-(7-x)LaF3-xYF3 (x = 0, 1, 3, 6 and 7). It was found that the crystal structure of the annealed glass-ceramics strongly depended on the ratio of YF3/LaF3. X-ray diffraction (XRD) and transmission electron microscopy (TEM) results revealed that the crystal structure transformed from cubic Ba2LaF7 phase to cubic intermediate phase and finally to cubic BaYF5 phase, the BaYF5 nanocrystal was determined as cubic structure instead of the reported tetragonal structure for the first time via a Rietveld refinement method with TOPAS. In the process of crystal structure transformation, the local symmetry around Tb3+ ions was infected by different types of irregularly arranged interstitial F- ions, which further affected the effective phonon energy around Tb3+ ions. The high effective phonon energy around Tb3+ ions in the intermediate phase could strongly enhance the up-conversion (UC) luminescence intensity, and thus improved the UC luminescence efficiency.

KW - Crystal structure transformation

KW - Effective phonon energy

KW - High local symmetry

KW - Intermediate phase

KW - Interstitial F ions

KW - Up-conversion

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DO - 10.1016/j.jallcom.2017.10.055

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JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

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