SiO_2对掺钕铝酸盐玻璃结构及光谱性质的影响  

Effects of Silicon Dioxide on Structure and Spectroscopic Properties of Neodymium Doped Calcium Aluminate Glass

作　　者：康帅[1,2] 何冬兵[1] 高松[1,2] 黄飞飞[1,2] 丁亚军[1,2] 胡丽丽[1] 

机构地区：[1]中国科学院上海光学机密机械研究所,上海201800 [2]中国科学院大学,北京100049

出　　处：《无机材料学报》2015年第11期1177-1182,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(61177083)~~

摘　　要：实验通过高温熔融法制备了不同Si O2浓度的掺钕钙铝酸盐玻璃。采用拉曼光谱法分析玻璃结构变化,发现随着Si O2含量的增加,[Al O4]网格中非桥氧逐渐转移至Si4+离子周围,玻璃主体Al-O网络中非桥氧减少,聚合度提高。实验测试了玻璃的吸收光谱和荧光光谱,并运用Judd-Ofelt理论计算Nd3+离子4F3/2→4I11/2跃迁的J-O参数?,自发辐射几率Arad,荧光分支比β,受激发射截面σe,辐射寿命τrad等。结果显示:随着Si O2浓度的增加,钕离子周围环境结构对称性提高,荧光发射峰半高宽变窄,同时受激发射截面逐渐增大。研究结果表明含有低浓度Si O2的掺钕钙铝酸盐激光玻璃有望用于超短脉冲激光领域。Nd3＋-doped calcium-aluminate glasses with different contents of Si O2 were prepared by conventional melting method. The change of glasses structures were studied by Raman spectroscope. The non-bridging oxygens（NBOs） around Si4＋ ions increase at higher Si O2 content samples which are transferred from alumina tetrahedron lattices and a more polymerization Al-O network appears in glass structure due to lower NBOs content. From the absorption spectra, J-O strength parameters（？）, spontaneous transition probabilities（Arad）, branching ratios（β）, emission cross-sections（σe）, and radiative life（τrad） were evaluated by Judd-Ofelt theory. Analysis on the evaluation result and fluorescence spectra reveal that the surrounding structure symmetry of Nd3＋ ions is ameliorated and the full width at half maximum（FWHM） of emission peak at 1067 nm is narrowed, meanwhile the emission cross-sections is enlarged gradually with the Si O2 content increasing. These results show that Nd3＋-doped calcium aluminate glass containing low content of Si O2 has potential applications in ultrashort-pulse laser materials.

关 键 词：光谱 钙铝酸盐玻璃 钕掺杂 结构变化 荧光半高宽 

分 类 号：TQ174[化学工程—陶瓷工业]