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半导体学报 2001
Photoluminescence Spectra of Organic Dyes Embedded in Porous Alumina
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Abstract:
The porous anodic alumina,formed by electrochemical oxidation of alumina,is characterized by fine,regular,almost cylindrical and parallelsided pores which can act as transparent host templates for a variety of luminescent media.Embedded the organic dyes in the pores in porous alumina,the embedded films are obtained.The photoluminescence and absorption spectra of the embedded dyes are measued and compared with those of the liquid dyes.It is found their absorption spectra are similar,while the photoluminescence spectra of the embedded films show a blue shift in the peak of the luminescence with the spectra more symmetric and the photoluminescence intensity decreased.It is also found that the organic dyes existing in the porous alumina are often in the form of monomers.After a series of post treatment on porous alumina before embedding the dyes in it,the photoluminescence intensity of the embedded dyes is found to be increased by heat treatment and increasing the porosity of porous alumina.