The study of properties and structure of terbium oxide doped zinc aluminum phosphate glasses

• Main Authors: Fu, Chuni, 傅珺怡
• Other Authors: Yang, Hsiwen
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/19548738150162638733

碩士 === 國立聯合大學 === 材料科學工程學系碩士班 === 99 === This study explores optical, physical and structure properties based on zinc aluminum phosphate glass system (P2O5-ZnO-Al2O3) doped with different amounts of (terbium oxide), which changed the composition ratio between ZnO and P2O5. With increasing the terbium oxide and ZnO contents the density,refractive index and chemical durability of glasses increase, while the molar volume and thermal expansion coefficient decrease. Structure of glasses was analyzed by Fourier-transformed-infrared spectroscopy, Raman spectroscopy and X-ray photoelectron spectroscopy in glasses system. With decreasing P2O5 content and the increase of network modifier (ZnO) leak the bridge oxygen bonds and the non-bridging oxygen bonds increase. In the optical analysis, with terbium oxide exceed 2.5 mol% the glasses exhibiters maximum intensity of blue emission from 5D3 to 7Fj level, while green emission from 5D4 level has increases linearly up to 9 mol% of Tb2O3. The concentration quenching of blue emission (5D3→7Fj) is attributed mainly to the cross-relaxation among the excited and nearest neighbor unexcited Tb3+ ions in the glass matrix. The fluorescence intensity increases with the increasing of ZnO content. The ZnO photogenerated electrons are trapped in the band gap defects which lie next to the Tb3+ excited states, and energy transferred to Tb3+ ion through radiation less process.