【摘要】 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。更多还原

【Abstract】 Fluorescence decay curves of the 3 P0 and 1 D2 manifolds in Pr3+ doped PbWO4 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 3 P0 and 1 D2 manifolds,respectively.The Inokuti-Hirayama model was used to analyze the fluorescence decay curve of the 1 D2 manifold and the cross-relaxation of dipole-dipole interaction was confirmed.更多还原