对掺铜0.2～1.0wt%三种含不同Cu~+离子浓度的磷酸盐玻璃,在室温和77K下作了时间分辨萤光光谱和萤光寿命的测定。用紫外220nm或320nm激发,在不同Cu~+离子浓度时,光谱性质都不一样。室温下220nm激发时,谱线较宽。并随延迟时间增加,谱线移向长波,线宽增加。320nm激发时,谱线无变化。低温下谱线的变化速率较慢。另外,在Cu~+离子浓度增加时,谱线的变化趋势不尽相同,且变化速率和幅度均增加。 萤光寿命的测定结果显示激发态离子的衰减速率与发射波长有关。发射波长愈短,衰减愈快。低温下衰减速率随发射波长的变化比室温下更甚。 本文用能量转移机理解释了实验现象。认为声子支助的离子-离子相互作用,使激发从高能隙格位迁移到低能隙格位。

Time-resolved fluorescence and lifetime measurements of Cu+ ions in phosphate glass with different copper concentrations from 0.2wt% to 1.0wt% have been performed at room temperature and 77K. Under UV 220nm or 320nm excitations the luminescence has different behaviours at different temperatures. On one hand, the spectrum excited at 220nm and room temperature are broader than that at 320nm, and move to longer wavel engths with the increase of delay time, while the spectra excited at 320nm show little changes with time evolution. At 77 K, however the spectra vary more slowly. In addition, in the case of increased On+ ions concentration the spectra vary rapidly and greatly in the peak position, and band, width. On the other hand, the experimental results sliow that the decay rates of ions being in the excited stato are dependent upon the emission wavelengths. The shorter the emission wavelength, the faster the ions decay. And a more notable dependence of them appears at 77 K than that at room temperature. The experimental results are interpreted by the energy transfer mechnism, It can be considered as the excitation migration from the sites having higher energy gap to ones having lower energy gap by phonon assisted ion-ion interaction.