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【答案】应助回帖
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超级老快: 金币+120, 翻译EPI+1, ★★★很有帮助 2016-11-24 08:43:25
1962 年由 B. R. Judd 和 G. S. Ofelt 两人同时建立的Judd-Ofelt理论，Judd-Ofelt 系数可以用来计算稀土离子发光的弛豫率、寿命、子能级的分布等[1]。英国科学家J.A.Duffy[2]提出了光学碱度理论，用来表征玻璃等非晶态体系的酸碱度，并可以通过公示计算玻璃的光学碱度，即固体组分中各个阳离子的摩尔分数与其碱度调节参数的乘积，然后取和即得固体的光学碱度。Han课题组[3]针对稀土离子掺杂的Al2O3-B2O3-SiO2玻璃的制备及性能研究中，讨论了玻璃的形成体，修饰体和中间体对掺杂的稀土离子的发光性质的影响。然而，使用还原性Al粉对玻璃中Eu3+离子进行还原，以及使用热处理机制使得玻璃中的Eu3+与Eu2+离子的比例却鲜有研究和解释。
B. R. Judd and G. S. Ofelt established Judd-Ofelt theory simultaneously in 1962. The Judd-Ofelt coefficency is used to calculate the relaxation rate, halftime, electron energy level (电子能级，不是子能级?)for rare earth ions[1]. British scientist J.A.Duffy [2] proposed to use photo basicity to characterize the basicity of noncrystal systems, such as glass. The photo basicity of glass can be calculated as the sum of the products of mole fractions of individual cations multipled with an adjusted basicity coefficiency for each components. Han's group [3] studied the manufacture and properties of rare earth doped Al2O3-B2O3-SiO2 glass. They discussed the influence of glass former, modifier and intermediate on the luminous properties of doped rare earth ions. However, reduction of Eu3+ with aluminium powder, and alter the ratio of Eu3+ and Eu2+ in glass by heat treatment have not been reported. |
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