C102∶RH6G多孔铝镶嵌膜的发光研究

Study of the Fluorescence Spectra of C102 and C102∶RH6G in Anodic Porous Alumina

将香豆素102(C102)和若丹明6G(RH6G)按一定的比例混合在乙醇溶液中,结果发现其荧光光谱出现了双峰结构,并研究了浓度对荧光光谱的影响。再将C102和RH6G镶嵌在一定条件下制备的多孔铝中,研究了不同浓度对多孔铝发光光谱的影响。实验表明C102∶RH6G多孔铝复合体系有可能是展宽固体可调谐激光器调谐范围的一种新途径。

In order to widen the tunable range, the PL spectra of C102 and RH6G in the ethanol solution with different concentration and in embedded filmsporous alumina were studied. C102 and RH6G are good dye in the dye family, they are characterized by wide tunable range and fine physical and chemical quality. The carrieranodic porous alumina is transparent in the range of visible light and that it will not disturb the absorption of dye.Commonly, the dye with shorter wavelength absorption and emission spectrum was named as donor, and the dye with longer wavelength absorption and emission spectrum was named as acceptor. It was known that if the fluorescence spectrum of the donor overlapped with the absorption spectrum of the acceptor, the donor would deliver part of its energy to the acceptor, and the acceptor would luminescence because of excitation. Anodization was conducted at a constant voltage condition using a DC stabilized power and flow supply and the specimens were prepared and measured in the ambient air.In this experiment, C102 was donor and RH6G was acceptor. It was found that the fluorescence spectrum of C102 and the absorption spectrum of RH6G overlapped in a certain range, so if they were mixed according to a definite proportion, the spectra would be expanded comparatively to any one of these two dyes. Keeping the concentration of the donor constant and altering that of the acceptor, the author found that, along with the increasing of the acceptor's concentration, the donor's fluorescence spectra shifted to shorter wavelength (blue shift), while the fluorescence of the acceptor shifted to longer wavelength (red shift). The trend of intensity alteration was that the intensity of donor changed from a degree far exceeding that of the acceptor to the degree almost equal to that of the acceptor and at last, the intensity of the acceptor exceeded that of the donor, when the intensity of acceptor was nearly equal to zero. All these suggested that energy transfer existed between donor and acceptor. The enhancement of acceptor PL intensity was at the cost of the weakening of donor PL intensity. Donor strengthened the efficiency of energy transfer while the concentration of acceptor increased. Compared with the fluorescence spectra in anodic porous alumina, it was found that the fluorescence spectra range of these two dye mixed together was wider evidently than that of one, and the trend of variation was similar to that in the ethanol solution. At last, the fluorescence spectra in ethanol solution and in anodic porous alumina were also compared.By this experiment, it was found that porous alumina perhaps was good medium in the development of solid tunable lasers.