透明光学树脂中Eu3+辐射参数的理论和实验研究

报道了一种新合成的含三元稀土配合物的透明光学树脂材料的辐射特性的研究。基于J-O参数理论,利用含稀土配合物Eu(TTA)3phen-0.31wt%的光学树脂的发射荧光光谱,计算了Eu3 在光学树脂基质中的J-O参数Ω2=10.139 4×10-20cm2,Ω4=3.810 9×10-20cm2,Ω6=9.050 7×10-20cm2。利用得到的J-O参数可以计算光学树脂中Eu3 的跃迁振子强度fcal,5D0激发态的辐射跃迁概率A(456.6 s-1)、辐射寿命τ(2 190.1μs),还计算了光学树脂中Eu3 的跃迁5D0→7FJ′(其中J′=1,2,4,6)的发射截面σ、荧光分支比β。通过分析计算得到的J-O参数可知,光学树脂中Eu3 的5D0亚稳态的寿命较长,跃迁5D0→7F2的发射截面最大,说明含稀土配合物的光学树脂具有作光放大或激光材料的潜在性。

Study on the Theory and Experiments of Radiative Parameters of the Eu3+Ion in Transparent Optical Resin

The optical properties of a transparent optical resin (HMA/ST) containing ternary rare earth complex are reported. Based on Judd-Ofelt (J-O) theory, the J-O parameters were calculated to be omega2 = 10.139 4 x 10(-20) cm2, omega4 = 3.810 9 x 10(-20) cm2, omega6 = 9.050 7 x 10(-20) cm2 by using the emission spectrum of optical resin containing Eu (TTA)3 phen-0.31 wt%. The J-O parameters were used to calculate the total radiative transition rate (456.6 s(-1)) and radiative lifetime (2 190.1 micros) of the excited state 5D0. The stimulated emission cross-sections a and the fluorescence branch ratio beta parameters for the transitions of 5D0 --> 7F(J), (where J' = 1, 2, 4 and 6) were also evaluated. By analyzing the calculated J-O parameters, it is concluded that the excited state of Eu3+ in optical resin has a long radiative lifetime and large emission cross-section, which shows that the optical resin containing rare earth complex can be used for stimulated emission amplification or as a laser material.