Schultheiss Silke, Yariv Eli, Reisfeld Renata, Breuer Hans Dieter
Institut für Physikalische Chemie, Universitat des Saarlandes, Im Stadtwald, 66123 Saarbrücken, Germany.
Photochem Photobiol Sci. 2002 May;1(5):320-3. doi: 10.1039/b200890d.
Silica-zirconia materials as well as silica-zirconia ormosils prepared by the sol-gel technique were doped with the laser dyes Rhodamine B and Rhodamine 6G and used as solid state dye lasers. The photostability and efficiency of the solid state laser samples were measured in a transverse pumping configuration by either a nitrogen laser or the second harmonic of a Nd-YAG laser. Under the excitation of a nitrogen laser the photostability of Rhodamine B in silica-zirconia materials was low and decreased with a growing amount of zirconia. The photophysical properties of the incorporated dyes were studied by time-resolved fluorescence spectroscopy. The fluorescence lifetimes of both dyes increased when the matrix was modified by organic compounds Furthermore, the threshold energy of Rhodamine 6G in two ormosils containing 3 and 50% methylsilica was measured. The results revealed that the threshold energy was lower for the matrix with a higher amount of ormosil while the slope efficiency was higher in the matrix containing 30% ormosil.
通过溶胶-凝胶技术制备的二氧化硅-氧化锆材料以及二氧化硅-氧化锆有机硅杂化材料，用激光染料罗丹明B和罗丹明6G进行掺杂，并用作固态染料激光器。固态激光样品的光稳定性和效率通过横向泵浦配置，用氮气激光器或Nd-YAG激光器的二次谐波进行测量。在氮气激光器的激发下，罗丹明B在二氧化硅-氧化锆材料中的光稳定性较低，且随着氧化锆含量的增加而降低。通过时间分辨荧光光谱研究了掺入染料的光物理性质。当基质用有机化合物改性时，两种染料的荧光寿命均增加。此外，还测量了含有3%和50%甲基硅石的两种有机硅杂化材料中罗丹明6G的阈值能量。结果表明，有机硅杂化材料含量较高的基质的阈值能量较低，而含有30%有机硅杂化材料的基质的斜率效率较高。
