KMgF_3∶Eu和KMgF_3∶Eu-Ce单晶体中Eu^(2+)与Ce^(3+)的格位取代和能量传递

Site Substitution and Energy Transfer of Eu^(2+) and Ce^(3+) in KMgF_3∶Eu and KMgF_3∶Eu-Ce Single Crystals

在 77K测定了两个晶体的高分辨发射光谱 ,讨论了单掺杂 Eu2 + 和双掺杂 Eu2 + 及 Ce3+ 的 KMg F3中的格位取代问题 .在 KMg F3∶ Eu-Ce中观察到了 Eu2 + 的 6P5/ 2 能级到 Ce3+ 的 4 f 5 d能级间的间接能量传递 。

The high resolution emission spectra of KMgF 3∶Eu and KMgF 3∶Eu Ce single crystals were measured at 77 K. The site substitution of Eu 2+ and Eu 2+ Ce 3+ co doped system in KMgF 3 was discussed. Eu 2+ substituted for K + sites on three different site symmetry: cubic, trigonal and tetragonal. The attribution of all lines occuring in the emission spectra were ascertained.The indirect energy transfer from 6 P 5/2 states of Eu 2+ to 4 f 5 d states of Ce 3+ in KMgF 3∶Eu Ce was observed and the energy transfer mechanism was studied. The d d interaction among levels was proposed.