凝胶中罗丹明6G的荧光性质

FLUORESCENT PROPERTIES OF RHODAMINE 6G DOPED IN SILICA GELS AND COATINGS VIA THE SOL-GEL PROCESS

用溶胶—凝胶法将不同浓度的罗丹明6G(Rhodamine 6G,R6G)染料掺入硅凝胶块和涂层薄膜中,用倍频 YAG 激光(0.53μm)做激发光源研究其荧光性质。对凝胶块、凝胶薄膜和乙醇溶液中 R6G 的荧光光谱进行了比较,研究了温度和 R6G 浓度对荧光性质的影响。实验结果表明,当R6G/SiO_2摩尔比高达 10^(-4)时,凝胶薄膜中的 R6G 分子仍不发生聚集现象;在475K 以下,积分荧光强度随温度的变化表现出很好的重现性;当温度高于600K 时,荧光消失,表明染料 R6G 已完全分解。

Rhodamine 6G(R6G),a widely used laser dye,is incorporated at differentconcentrations in silica gels and coatings via the sol-gel process,and its fluorescent proper-ties are studied using a frequency-doubled YAG laser(0.53μm)as the excitation lightsource.Comparisons are made between the fluourescent spectra of R6G trapped in silicagels and coatings as well as dissolved in ethanol.The effects of temperature and the concen-tration of R6G on the fluorescent property are examined.It turns out from the experimen-tal results that no aggregation of the dye molecules occurs even when the concentration ofR6G in the coatings is as high as 10^(-4)(R6G/SiO_2 mole ratio).Below 475K the integralfluorescent intensity exhibits good reproducibility with the change of temperature,and thedye decomposes completely at 600K resulting in the disappearance of the fluorescence.