Eu‐, Tb‐, and Dy‐Doped Oxyfluoride Silicate Glasses for LED Applications. Issue 3 (14th December 2013)

• Record Type: Journal Article
• Authors: Zhu, Chaofeng; Wang, Jia; Zhang, Meimei; Ren, Xiaorong; Shen, Jianxing; Yue, Yuanzheng; Ballato, J.
• Is Part Of: Journal of the American Ceramic Society. Volume 97:Issue 3(2014)
• Page Start: 854
• Page End: 861
• Publication Date: 2013-12-14
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.12714
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace12714-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>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 Tb<sup>3+</sup> single‐doped oxyfluoride silicate glasses. The <sup>5</sup><italic>D</italic><sub>3</sub> emission of Tb<sup>3+</sup> can be suppressed by introducing B<sub>2</sub>O<sub>3</sub> into the glass. The conversion of Eu<sup>3+</sup> to Eu<sup>2+</sup> takes place in Eu single‐doped oxyfluoride aluminosilicate glasses. The creation of CaF<sub>2</sub> crystals enhances the conversion efficiency. In addition, energy transfers from Dy<sup>3+</sup> to Tb<sup>3+</sup> and Tb<sup>3+</sup> to Eu<sup>3+</sup> ions occurred in Eu/Tb/Dy codoped glasses, which can be confirmed by analyzing fluorescence spectra and energy level diagrams.</p> </abstract>