SDS增溶DCM水溶液的荧光特性研究

Study on Fluorescence Property of DCM with SDS in Water Solution Excited by 532 nm Laser

研究了十二烷基硫酸钠(SDS)增溶DCM水溶液的荧光光谱特性。随着SDS浓度的增加,DCM在水中的溶解度大大增加,荧光强度增强;当SDS浓度从0.025mol·L-1增加到0.5mol·L-1时,荧光峰值相对强度增强95倍。用532nm激光激发SDS增溶DCM水溶液获得648nm的强染料激光输出,其波长相对于由DCM乙醇溶液获得的635nm染料激光红移13nm。利用该溶液荧光对苯的受激拉曼散射(SRS)Stokes波长选择增强。作为对比,用DCM乙醇溶液的荧光对苯受激拉曼散射进行选择增强,结果显示出二者对苯的二、三、四阶Stokes波均可产生放大,但前者最大放大波长位于第三阶Stokes线(632nm)处,放大因子8.5,后者最大放大波长位于第二阶Stokes线(595nm)处,放大因子为2.5。另外分析讨论了SDS增溶DCM水溶液和荧光增强的机制及其应用前景。

The fluorescence property of DCM in water solution with added different concentration of SDS is reported. With increasing the concentration of SDS in water, the solubility of DCM and the fluorescence intensity increase. When the concentration of SDS increases from 0. 025 to 0. 5 mol · L^-1 , the maximum fluorescence relative intensity is enhanced by a factor of 95. A powerful dye laser at wavelength of 648 nm was generated in the solution of DCM in water with .SDS exited by a 532 nm laser. It shifts 13 nm compared with the dye laser wavelength of the solution of DCM in ethanol. And enhancement of SRS of C6H6 was achieved both in the solution of DCM in water with SDS and in the solution of DCM in ethanol. The result is that the second, the third and the forth order Stokes of C6 H6 are all enhanced. But the former mainly enhances the forth order Stokes（632 nm） and the enhancement gain coefficient is 8. 5, while the latter mainly enhances the third order Stokes（595 nm） and the enhancement gain coefficient is 2. 5. The mechanism of solubility, fluorescence enhancement and its possible application are discussed.