针对铋掺杂玻璃发光机理不明确的问题, 以Bi2O3-AlPO4-SiO2玻璃为研究对象, 对其开展结构研究。采用硝酸铋、乳酸铝、磷酸三乙酯和正硅酸四乙酯作为前驱体, 通过溶胶-凝胶法制备了xBi2O3-AlPO4-SiO2 (0≤x≤0.15)的三元体系玻璃, 并使用固态核磁共振(NMR)技术及X射线光电子能谱系统解析了xBi2O3-AlPO4-SiO2玻璃的原子级结构。NMR结果证明: 制备的玻璃由AlPO4和SiO2纳米团簇组成。XPS结果表明该系列的玻璃中没有形成Bi-O-Bi键。通过27Al{31P} REDOR、31P{27Al} REAPDOR, 31P CT-DRENAR-BABA-xy16, 及29Si MAS单共振实验证明: Bi2O3的加入促进了AlPO4团簇逐步增大, 直到最后形成明显的分相, Bi2O3同时存在于SiO2和AlPO4两相中。

Nd3+ strengthens the Er3+:2.7-\mu m emission 104 times in fluorophosphate glass; in addition, it can also decrease its upconversion effects and the 1.5-\mu m emission accordingly. Cross-relaxation process is the principal transition mechanism in this codoping system. Compared with Er3+ singly doped glass, J-O parameters along with the Arad, \beta, \tau_R values of Er3+ change markedly in Er3+:Nd3+ codoped glass because Nd3+ greatly influences the local environment around Er3+. Results also show that Nd3+ has a good 4I13/2 lifetime quenching effect as well as thermal load reduction ability for Er3+:2.7-\mu m emission.