摘要
Ｘ射线衍射研究表明２ＢａＯ·（１—ｘ）Ｌａ２Ｏ３·９Ｂ２Ｏ３·Ｅｕ２Ｏ３（ＢＬＢＥ）体系的玻璃化温度在１０２５℃附近；荧光光谱研究表明，在ＢＬＢＥ体系中存在着Ｅｕ２＋和Ｅｕ３＋两种价态离子，３１６，３６０，３７９，３９３，４１３，４６２和５１２ｎｍ锐线激发峰和 ５９２，６１６，６５０和 ７５０ ｎｍ红区发射峰分别对应Ｅｕ３＋离子的ｆ－ｆ激发跃迁和５Ｄ０－７ＦＪ（Ｊ＝１，２，３，４）跃迁发射，４３０ ｎｍ和５３２ｎｍ宽带激发峰和蓝区发射分别对应Ｅｕ２＋”离子的５ｄ－４ｆ激发跃迁和发射，引入Ｇｄ３＋离子能明显改善玻璃的红蓝光发射比，表明在ＢＬＢＥＧ体系中存在着 Ｇｄ３＋→Ｅｕ２＋→ Ｅｕ３＋能量传递过程．
The result of X ray powder diffraction indicates that glass forms at 1 025 °C in the system of 2BaO·(1 - x)La2O3· 9B2O3· xEu2O3 (BLBE). The study of luminescence spectra reveals that two valence ions, Eu2+ and Eu3+ have existed in this system. The acute excitation bands at 316, 360, 379, 393, 413, 462 and 532 nm, the red-region emission bands at 592, 616, 650 and 750 nm correspond to the f-f excitation transition and the emission transition of 5Do - 7FJ(J=1,2,3,4,) of Eu3+ ions, respectively. Likewise, the broad excitation bands at 430 nm and 532 nm correspond to the 5d-4f excitation transition of Eu2+ ions, and the blue emission bands to the emission of Eu2+ ions. By the result that the introduction of Gd3+ ion can distinctly improve the emission intensity ratios of the blue-light and red-light of the glass, it indicates that the main process of energy transfer is Gd3+-Eu2+ Eu3+ in BLBEG system.
出处
《湖南师范大学自然科学学报》
EI
CAS
北大核心
2001年第2期58-60,87,共4页
Journal of Natural Science of Hunan Normal University
基金
国家自然科学基金资助项目(2007011)
关键词
硼酸盐
玻璃
共激活发光
铕离子
Energy transfer
Europium compounds
Ions
Luminescence
X ray powder diffraction
