磷酸盐、锗酸盐和碲酸盐玻璃中Ce3+、Tb3+、Er3+和Tm3+离子的发光和敏化作用的研究——Ⅱ.辐射跃迁、无辐射跃迁和能量转移

对不同玻璃基质中的Tb3+、Er3+和Tm3+离子的辐射跃迁和无辐射跃迁速率进行了计算和测量,并讨论了基质玻璃对跃迁特性的影响。研究了Ce3+对Er3+、Tm3+,Tb3+的敏化作用,得出Ce3+对Er3+离子的敏化作用是弱的,而Ce3+对Tm3+和Tb3+是较强的,并对敏化机理进行了讨论。

LUMINESCENCE OF Ce3+,Tb3+,Er3+,Tm3+ IONS IN PHOSPHATE,GERMANATE, TELLURATE GLASSES AND STUDY OF SENSITIZATION

In part I of this series of papers1], the absorption, excitation and emission spectra of Ce3+,Tb3+, Er3+ and Tm3+ ions in phosphate, germanate tellurete glasses have been reported. In this paper experimental and calculated results of radiative and nonradiative transition rate of these ions in verious glasses are given. Radiative transition rates are calculated with intensity parameters, which is obtained by fitting the absorption spectra with Judd-Ofelt2] theory. Because the luminescence lifetime of Ce3+, Er3+ and Tm3+ is rather short and difficult to be determined, less work on relaxation processes of these ions in glasses has been done. Exciting the samples with short pulsed (pulse width 10ns) from an exciter laser, lifetimes of fluorescent ions are measured. Nonradiative transition rates are then calculated from the measured lifetimes and radiative transition rates.