Eu^(2+)和Mn^(2+)在Sr_3MgSi_2O_8中的光致发光研究

Photoluminescence of Eu^(2+)and Mn^(2+) in Sr_3MgSi_2O_8

研究了Eu2＋和Mn2＋共激活的Sr3MgSi2O8的荧光性质．Eu2＋和Mn2＋在460nm和690nm的发射峰分别由Eu2＋的5d→4f跃迁和Mn2＋的4T1（4G）→6A1R（6S）跃迁产生．未观察到单掺杂Mn2＋的Sr3MgSi2O8的荧光发射，而掺入Eu2＋后则出现了Mn2＋的690nm光致发光峰，表明Eu2＋对Mn2＋有敏化作从Eu2＋的荧光寿命也受Mn2＋含量的影响．实验结果表明，在Sr3MgSi2O8基质中存在着Eu2＋对Mn2＋的能量传递，属于电偶极-电偶极相互作用引起的共振能量传递．

The fluorescence of Eu2+ and Mn2+ coactivated Sr3MgSi2O8 was studied. The emission bands of Eu2+ and Mn2+ peaking at 460 nm and 690 nm are originated from 5d-4f transition of Eu2+ and 4T, (4G) -6A1g(6S) transition of Mn2+ respectively. The fluorescence of Mn2+, singly doped in Sr3MgSi2O,8 has not been observed. However, codoping with Eu2+makes photoluminescence of Mn2+ apPear at 690 nm. This shows that the emission of Mn2+is sensitized by Eu2+, and then the fluorescence lifetime of Eu2+ is affected by Mn2+. The ex-perimental results indicate that there exists an effective energy transfer from Eu2+ to Mn2+ in Sr3MgSi2O8 host. This kind of energy transfer is due to the electric dipole-dipole interaction of the resonance transfer.