铁杂质在Eu^(2+),Dy^(3+)激活的铝酸锶发光粉中发光猝灭研究

Luminescence quenching by iron impurity in Eu^(2+),Dy^(3+) doped strontium aluminates

利用纳米包覆技术制备了掺杂不同含铁量的发光粉SrAl2O4:Eu,Dy,通过X射线衍射、发射光谱和余辉曲线等测试手段研究了铁杂质对发光粉的晶体结构以及发光性能的影响.结果表明微量铁的存在没有引起发光粉的晶相结构变化,但降低了发光强度.随着铁含量从0.001 mol增加到0.01 mol,余辉平均发光强度下降了50%,这种变化是由于Fe3+—O2-中心将一部分能量传递到红外区域引起的,同时首次发现了铁在铝酸锶晶体中的红外发光现象.

The long afterglow phosphors SrAl2O4. Eu, Dy with different iron content have been prepared by nano-alumina coating process. The effect of crystal structure and luminescence properties of the phosphors by iron is investigated by XRD, luminescence spectra and afterglow curve. It is found that its crystal structure has no change, but luminescence properties have been quenched due to the existence of iron. By changing the iron content from 0. 001 mol to 0.01 mol, the average luminescence intensity is decreased by 50%, which may be due to the Fe^3＋-O^2- energy transfer to infrared site. Simultaneously, the infrared luminescence in strontium aluminates by iron is observed for the first time.