LaMgAl_(11)O_(19):Mn^(2+)和LaMgAl_(11)O_(19):RE,Mn^(2+)(RE=Eu^(2+), Gd^(3+))的发光特性(英文)

Luminescence Properties of LaMgAl_(11)O_(19):Mn^(2+) and LaMgAl_(11)O_(19):RE, Mn^(2+)(RE=Eu^(2+),Gd^(3+)) under UV/VUV Excitation

以H3BO3作助熔剂,用高温固相法在1150℃、保温4h的条件下成功制备了LaMgAl11O19:Mn的单相粉末样品并研究了其真空紫外光激发下的一系列发光特性。在紫外光(254nm)激发下,LaMgAl11O19:Mn不发光;真空紫外光(147nm)激发下,观察到Mn2+很强的3d5→3d44s的跃迁发光,峰值位于516nm,结果表明,Mn2+的掺杂浓度在0.05mol/mol时发光最强。为了继续增强LaMgAl11O19中Mn2+的发光强度,在固定Mn2+的浓度为0.05mol/mol的条件下又合成了LaMgAl11O19:(Eu2+,Mn2+)与LaMgAl11O19:(Gd3+,Mn2+),利用(Eu2+,Mn2+)和(Gd3+,Mn2+)间存在有效的能量传递的特性,很好的达到了增强Mn2+的发光的目的。

Using H3BO3 as a flux, LaMgAl11O19：Mn^2＋ and LaMgAl11O19：RE, Mn^2＋（RE=Eu^2＋, Gd^3＋） were synthesized by solid state reaction at 1150 ℃ for 4 h. The effect of Mn^2＋ on the luminescent properties excited by vacuum ultraviolet （VUV） was investigated. The strong emission spectrum excited by 147 nm is composed of peaks from Eu^2＋ and Mn^2＋ luminescence in LaMgAl11O19（Eu^2＋, Mn^2＋） and only Mn^2＋ luminescence in LaMgAl11O19：Mn^2＋ and LaMgAl11O19：（Gd^3＋, Mn^2＋）. The results show that the green emission of Mn^2＋ becomes stronger because of efficient energy transferring from Eu^2＋ and Gd^3＋ to Mn^2＋.