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Eu-, Tb-, and Dy-Doped Oxyfluoride Silicate Glasses for LED Applications

Authors

  • Chaofeng Zhu,

    Corresponding author
    1. Key Laboratory of Processing and Testing Technology of Glass and Functional Ceramics of Shandong Province, Qilu University of Technology, Jinan, China
    2. Key Laboratory of Amorphous and Polycrystalline Materials in Universities of Shandong, Qilu University of Technology, Jinan, China
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  • Jia Wang,

    1. Key Laboratory of Processing and Testing Technology of Glass and Functional Ceramics of Shandong Province, Qilu University of Technology, Jinan, China
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  • Meimei Zhang,

    1. Key Laboratory of Processing and Testing Technology of Glass and Functional Ceramics of Shandong Province, Qilu University of Technology, Jinan, China
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  • Xiaorong Ren,

    1. Instrumental Analysis Center, Qilu University of Technology, Jinan, China
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  • Jianxing Shen,

    1. Key Laboratory of Processing and Testing Technology of Glass and Functional Ceramics of Shandong Province, Qilu University of Technology, Jinan, China
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  • Yuanzheng Yue

    Corresponding author
    1. Key Laboratory of Processing and Testing Technology of Glass and Functional Ceramics of Shandong Province, Qilu University of Technology, Jinan, China
    2. Section of Chemistry, Aalborg University, Aalborg, Denmark
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Abstract

Luminescence glass is a potential candidate for the light-emitting diodes (LEDs) applications. Here, we study the structural and optical properties of the Eu-, Tb-, and Dy-doped oxyfluoride silicate glasses for LEDs by means of X-ray diffraction, photoluminescence spectra, Commission Internationale de L'Eclairage (CIE) chromaticity coordinates, and correlated color temperatures (CCTs). The results show that the white light emission can be achieved in Eu/Tb/Dy codoped oxyfluoride silicate glasses under excitation by near-ultraviolet light due to the simultaneous generation of blue, green, yellow, and red-light wavelengths from Tb, Dy, and Eu ions. The optical performances can be tuned by varying the glass composition and excitation wavelength. Furthermore, we observed a remarkable emission spectral change for the Tb3+ single-doped oxyfluoride silicate glasses. The 5D3 emission of Tb3+ can be suppressed by introducing B2O3 into the glass. The conversion of Eu3+ to Eu2+ takes place in Eu single-doped oxyfluoride aluminosilicate glasses. The creation of CaF2 crystals enhances the conversion efficiency. In addition, energy transfers from Dy3+ to Tb3+ and Tb3+ to Eu3+ ions occurred in Eu/Tb/Dy codoped glasses, which can be confirmed by analyzing fluorescence spectra and energy level diagrams.

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