Spectroscopic properties of Er3+/Yb3+ co-doped 50SiO2–20Al2O3–30CaF2 glass and glass ceramics

• Published in: Journal of physics. Condensed matter Vol. 18; no. 29; pp. 6937 - 6951
• Main Authors: Qiao, Xvsheng, Fan, Xianping, Wang, Minquan, Adam, Jean-Luc, Zhang, Xianghua
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 26.07.2006; Institute of Physics; IOP Publishing [1989-....]
• Subjects: Amorphous materials, glasses and other disordered solids; Chemical Sciences; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Material chemistry; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Photoluminescence; Physics; Inorganic compounds; Photoluminescence; Glass; Judd-Ofelt theory; XRD; Calcium fluorides; Silica; Spontaneous emission; Transmission electron microscopy; Oscillator strengths; Yttrium additions; Two-photon processes; Glass ceramics; Impurity states; Transparent material; Erbium additions; Codoping; Nanocrystal; Aluminium oxides; Condensed matter: electrical; mechanical & thermal; Condensed matter: structural; magnetic and optical
• ISSN: 0953-8984; 1361-648X
• DOI: 10.1088/0953-8984/18/29/030

A spectroscopic investigation of Er3+/Yb3+ co-doped 50SiO2-20Al2O3-30CaF2 glasses and transparent glass ceramics containing CaF2 nanocrystals is presented. The formation of CaF2 nanocrystals in the glass ceramic was confirmed by x-ray diffraction (XRD) and transmission electron microscopy (TEM). The Judd-Ofelt parameters of the Er3+ ions in the glass and glass ceramic have been calculated; they suggested that Er3+ ions had been incorporated into CaF2 nanocrystals in the glass ceramics. The upconversion luminescence intensity of the Er3+/Yb3+ co-doped glass ceramic was much stronger than that of the Er3+/Yb3+ co-doped glass. The upconversion luminescence mechanism has been ascribed to a two-photon absorption process for the green and red luminescence and a three-photon absorption process for the blue luminescence.