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基于以前综合V F模型 (考虑施主 受主 (D A)能量传递 )和B模型 (考虑施主 施主 (D D)能量迁移 )而提出的V F B综合模型 ,对La1-xErxF3 体系中Er3 +离子四种低掺杂浓度下 (x =0 0 0 1,0 0 0 3,0 0 1,0 0 2 ) 2 95K时4 S3/2 →4 I15/2 发光的时间演化曲线成功地重新进行了数值拟合 .结果表明该体系内D A间交叉弛豫能量传递是偶极 偶极作用 ,作用常数CDA为 4 75× 10 -4 1cm6/s,与Okamoto等人原用Y T扩散模型得到的结果一致 .而拟合得到的四个D D平均跳跃时间τ0 粗略地与xDα 次方 (xD 为D离子浓度 )成正比 (α≈ - 1 2 37) ,并不遵从τ0 很小时与xD 的- 2次方成正比的理论关系 .同时 ,通过把D D迁移和D A传递同时同样地纳入V F模型还粗略估计了D D平均跳跃时间τ0 ′的值 ,发现它与V F B给出的τ0 拟合值比较一致 ,说明V F B模型在一定近似程度上是内部自恰的、合理的 .
Based on the VFB integrated model proposed in the previous comprehensive VF model (considering the donor energy transfer) and the B model (considering donor energy transfer), four low-doped Er3 + ions in La1-xErxF3 system The time evolution curves of 4 S3 / 2 → 4 I15 / 2 luminescence at 2 95 K at a concentration of x = 0 0 0 0 0 0 3,0 0 1,0 0 2 were successfully reconstructed numerically. Results The results show that the energy transfer across the DA in the system is dipole dipole interaction with constant CDA of 4 75 × 10 -4 1 cm 6 / s, which is consistent with the original YT diffusion model of Okamoto et al. The four DD average jump times τ0 are roughly proportional to the xDα power (xD is the D ion concentration) (α≈ - 1 2 37) and do not follow the theoretical relationship proportional to the power-2 power of xD when τ0 is small At the same time, we estimate DD mean jump time τ0 ’roughly by incorporating DD migration and DA transfer into VF model at the same time, and find that it is consistent with the τ0 fitting value given by VFB, which shows that the VFB model is close to a certain degree of approximation On the internal self-consistency, reasonable.