镨离子掺杂钨酸铅晶体荧光衰减动态研究

Fluorescence Decay Dynamics of Praseodymium Ions Doped in Lead Tungstate Crystal

测量Pr3+:PbWO4晶体3P0和1D2能级在常温下的荧光衰减曲线,计算这2个能级的荧光寿命。结合改进的Judd-Ofelt理论得到3P0和1D2能级的辐射寿命,详细分析了这2个能级的荧光衰减动态情况。对于3P0能级,其荧光衰减主要是受到多声子无辐射跃迁的影响;对于1D2能级,其无辐射衰减的主要通道是共振交叉能量传递。采用Inokuti-Hirayama模型,详细分析1D2能级的荧光衰减过程,证实其荧光猝灭机制是电偶极-电偶极交叉能量传递。

Fluorescence decay curves of the ^3P0 and ^1D2 manifolds in Pr^3＋ doped PbWO3 crystal were measured at room temperature and fluorescence lifetimes of both manifolds were estimated. Combining with the radiative lifetimes of those manifolds calculated on the basis of the modified J-O theory,the fluorescence decay dynamics of those manifolds were analyzed. The multi-phonon relaxation and the cross-relaxation energy transfer are the major nonradiative relaxation for the excited ^3P0 and ^1D2 manifolds,respectively. The Inokuti-Hirayama model was used to analyze the fluorescence decay curve of the ^1D2 manifold and the cross-relaxation of dipole-dipole interaction was confirmed.