Preparation of a transparent alumina film doped with fluorescence dye and its energy transfer laser emission

Abstract A transparent alumina film was prepared from an aqueous sol by the sol-gel process. Changes in the fluorescence of 7-azaindole were monitored during the processing from the aqueous sol to the dried gel by dehydration. Coumarin 1, which is insoluble in water, and an anionic dye, uranin, were doped into the film by utilization of surface-active reagents, Triton X-100 and cetyltrimethylammonium bromide respectively. This doped film exhibited energy-transfer-type laser emission by nitrogen laser pumping.