【摘要】 <正> 罗丹明6G(R6G)是一个被广泛应用的激光染料,因此有很多人研究它的性质。已知R6G是离子型化合物,因此在有机溶剂中,分子和离子形式可同时存在,本文从改变溶剂性质,用以了解是分子还是离子发射荧光。实验结果表明R6G的荧光来源于它的离子态。实验试剂 R6G为BDH公司产品,经中国医药公司上海化学试剂采购站分装,其他试剂均为北京化工厂A.R.级试剂,在试验条件下均无干扰荧光,因而未进一步纯化。更多还原

【Abstract】 The absorption spectra and fluorescence spectra of Rhodamine 6G were measured in mixed solvents of benzene and methyl alcohol. As the concentration of methyl alcohol in the solution increases, fluorescence intensity and optical density increase too,although the concentration of Rhodamine 6G is kept constant. For exclusion the possible increase in fluorescence intensity contributed by the increase of quantum yield in methyl alcohol, decay time of Rhodamine 6G in solution with different compositions of benzene and methyl alcohol were measured and the results show that the decay life times are only slightly increased which can not compensate the increase in fluorescence intensity. The reasonable explanation is that as the concentration of methyl alcohol in the solution increases, the dielectric constant of the solution increases so the dissociate constant becomes larger and larger. The increases of optical density and fluorescence intensity are contributed by the increase of the concentration of ion of Rhodamine 6G.更多还原