Recent development in the process of oxide glass preparation by the sol-gel method which is an organic polymerization procedure based on the hydrolysis and condensation reactions opened the possibility to use these superior materials as an oxide matrix of organic dyes.RhB laser dyes

one of whose key problems in the investigation and application was the matrix which hosted the dye

were successfully embedded in SiO

2

gels.Many aspects of dye doped SiO

2

gels had been studied

but the photoluminescence(PL) during different periods of the sol-gel process and the effect of the refluence had not yet been reported.Those were the main problems that were involved in this series of experiments.The starting materials in all of the experiments were: tetraethylorthosilicate [Si(OC

2

H

4

)

4

TEOS]

deionized water[H

2

O]

ethanol[C

2

H

5

OH]

Rhodamine B(RhB)

and nitric acid in which the ratio of the materials in volume was TEOS:C

2

H

5

OH:H

2

O=1:4:20.The addition of HNO

3

making the pH of the solution equal to 1 was applied as catalyst for the hydrolysis of TEOS.TEOS was hydrolyzed and polymerized using refluence method at 60℃ for 2 hours.The sol thus obtained was highly transparent and then it was sealed for 10 days.Subsequently

dried gel was prepared by baking the sample at about 90℃ for 7 days.During the course

the PL spectra of different periods of the sol-gel course were measured by RF- 5301(PC) S (Shimadzu Corporation

made in Japan).The peaks of the PL of the embedded dyes exhibited red shift in the whole process while the intensity increased at first and then decreased.Another group of samples were made without refluence during the period of hydrolysis and polymerization process while all the other steps were the same.The PL spectra during the period of aging were also obtained.Red shift of the peak wavelength was observed while the degree of the shift without refluence was much stronger.