根据X射线激发下包膜的LaOBr:Tb的发射光谱,用Judd—ofelt理论,计算了此粉末晶体中Tb~(3+)的强度参量Ωλ(或τ_λ)以及~5D_3、~5D_4到~7F_J能级的相对强度,并利用Ω_λ三参量计算了~5D_3～~7F_J和~5D_4～~7F_J能级的电偶极和磁偶极振子强度,电偶极和磁偶极辐射跃迁几率,辐射寿命和荧光分支比等光谱参数,理论分析与实验结果一致。 According to the emission spectrum of LaOBr: Tb under the excitation of X-ray, the intensity parameters of Tb ~ (3+) in this powder crystal were calculated by Judd-ofelt theory. The relative intensities of electric dipole and dipole are calculated. The electric dipole and dipole oscillator strengths of ~ 5D_3 ~ 7F_J and ~ 5D_4 ~ 7F_J are calculated by the three-parameter Ω_λ, the dipole and dipole radiation transition probability, the radiation lifetime And fluorescence branching ratio and other spectral parameters, the theoretical analysis and experimental results.