用Judd-Ofelt理论计算TmP5O14晶体中Tm3+的光谱参数

根据Judd-Ofelt理论,测得了Tm3+ 在TmP5O14晶体中的强度参数分别为Q2=:1.50×10-20cm2,Q4=1.51×10-20cm2,Q6=0.916×10-20cm2,计算的振子强度Pcal.与实验值Pexp.符合较好,平均根方误差为2.60×10-7。求得Qλ后,计算了J多重激发态之间的振子强度,自发辐射跃迁速率,辐射寿命和荧光分支出,与YAlO3:Tm3+,YAG:Tm3+、Y2O3:Tm3+等晶体和掺Tm3+玻璃的光谱参数进行了比较,并就3H4→3H6,3F4→3H5,1D2→3H4和1G4→3H4的跃迁进行了对比和讨论。观察到Tm3+在不同介质中的Pexp.与强度参数的总和∑τλ=τ2+τ4+τ6存在Pexp=α∑τλ+b的关系。

SPECTRAL PARAMETERS OF Tm3+ IN CRYSTAL TmP5O14 CALCULATED BY JUDD-OFELT THEORY

According to Judd-Ofelt theory the intensity parameters of Tm3+ in crystal TmP5O14 were measured.Their values are Ω2=1.50×10-20cm2,Q4=1.5×10-20cm2 and Ω6=0.916×10-20cm2,respectively.The calculated oscillator strengths Pcal.agree with the experimental values Paxp.quite well,the root mean square deviation(rms)is 2.60×10-7.With these Ωλ values,the oscillator strengths,spontaneous radiative transition rates,radiative lifetimes and branching ratios between the excited J manifolds were calculated.The spectral parameters obtained were compared with,those of crytals YAlOs:Tm3+,YAG:Tm3+,Y2O3:Tm3+ and glasses doped with Tm3+ .The summation of intensity parameters(∑τλ=τz +τ4 +τ6)of Tm3+ in crystal TmP5O14 are lower than those of phosphate glass as well as other glasses(borate,germanate and tellurate).∑τλ is a parameter,we found that it is proportional to the oscillator strength P and may be expressed by following equation:P=α∑τλ+b where a and b are two constants obtained from experiments.