若丹明B掺杂的SiO_2凝胶的荧光光谱研究  

Photoluminescence of Rhodamine B Doped SiO_2 Gels

作　　者：冀会辉[1] 李清山[1] 

机构地区：[1]曲阜师范大学物理系,山东曲阜273165

出　　处：《发光学报》2002年第3期282-286,共5页Chinese Journal of Luminescence

基　　金：山东省自然科学基金资助项目 (Y98A10 0 13 )

摘　　要：以正硅酸乙酯 (TEOS)和有机染料若丹明B(RhodamineB)为原料 ,采用溶胶 凝胶方法 (thesol gelmethod)制备了若丹明B掺杂的SiO2 凝胶 ,研究了SiO2 凝胶的荧光光谱。报道了若丹明B在SiO2 凝胶中的荧光光谱比在水中的荧光光谱发生红移 ,尤其在制备过程中的不同阶段 ,若丹明B掺杂SiO2 凝胶的荧光光谱的峰位发生的一系列变化 ,从而得到了若丹明B在水中及若丹明B在SiO2 凝胶制备过程之中 ,直至SiO2 凝胶制备完毕的荧光光谱发生变化的全过程。还报道了在反应中的磁力搅拌阶段 ,采用回流过程和不采用回流过程两种方法时 ,对所得若丹明B掺杂SiO2Recent 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 2H 4) 4,TEOS], deionized water, ethanol[C 2H 5OH], Rhodamine B(RhB), and nitric acid in which the ratio of the materials in volume was TEOS∶C 2H 5OH∶H 2O=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.

关 键 词：溶胶-凝胶方法 荧光光谱 SiO2凝胶 若丹明B 有机染料 二氧化硅 染料激光器 

分 类 号：TN248.33[电子电信—物理电子学] O648.124[理学—物理化学]