Mahato K K, Rai S B, Rai Anita
Department of Physics, Banaras Hindu University, Varanasi 221005, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2004 Mar;60(4):979-85. doi: 10.1016/S1386-1425(03)00328-7.
Rare earth doped oxyfluoroborate glasses have been prepared with different concentration of Eu3+. The UV-Vis/NIR optical absorption, laser induced fluorescence and photoacoustic spectra of Eu3+ in this host have been studied. Different optical parameters such as oscillator strength, Judd-Ofelt intensity parameter, stimulated emission cross-section, transition probability, branching ratio and radiative lifetime, etc. have been calculated. Lifetime of the 5D0 level at various concentrations of Eu3+ have been used to explain the concentration dependent fluorescence quenching. The mechanism of quenching was found to be dipole-dipole. Energy transfer have also been studied from Eu3+ to Pr3+ in sample with 1 mol% (Eu3+) + 1 mol% Pr3+.
制备了不同Eu3+浓度的稀土掺杂氟硼酸盐玻璃。研究了该基质中Eu3+的紫外-可见/近红外光吸收、激光诱导荧光和光声光谱。计算了不同的光学参数，如振子强度、贾德-奥费尔特强度参数、受激发射截面、跃迁概率、分支比和辐射寿命等。利用不同Eu3+浓度下5D0能级的寿命来解释浓度依赖的荧光猝灭。发现猝灭机制为偶极-偶极相互作用。还研究了1 mol%（Eu3+）+1 mol% Pr3+样品中从Eu3+到Pr3+的能量转移。
