有序介孔SBA-15紫外光致发光机理研究

doi:10.3969/j.issn.0253-2778.2010.01.010

中国科学技术大学学报 ›› 2010, Vol. 40 ›› Issue (1): 58-61.DOI: 10.3969/j.issn.0253-2778.2010.01.010

有序介孔SBA-15紫外光致发光机理研究

徐海涛

中国科学技术大学材料科学与工程系，安徽合肥 230026

收稿日期:2009-02-06 修回日期:2009-04-22 出版日期:2010-01-31 发布日期:2010-01-31
通讯作者: 王玉霞
作者简介:徐海涛，男，1982年生，硕士生. 研究方向: 光电功能材料. E-mail: xuhaitao@mail.ustc.edu.cn
基金资助:
国家自然科学基金(50672095)资助.

Ultraviolet photoluminescence from SBA-15 ordered mesoporous silica

XU Haitao

Department of Materials Science and Engineering，University of Science and Technology of China,Hefei 230026，China

Received:2009-02-06 Revised:2009-04-22 Online:2010-01-31 Published:2010-01-31

摘要/Abstract

摘要： 用水热法制备出了有序介孔二氧化硅SBA-15，分别在室温下进行了光致发光(PL)和电子顺磁共振(EPR)分析.室温PL谱分析发现了位于38 eV的紫外光致发光峰，进一步研究发现，样品在空气中静置十天后，38 eV的发光峰强度会增强.通过样品在不同温度下的退火试验分析并结合EPR谱，对这一发光的机理给予了解析，认为可能是介孔二氧化硅SBA-15中的ODC(Ⅱ)(≡Si…Si≡)缺陷与介孔中吸附的水分子反应形成的硅醇基(≡Si—OH)产生的发光.

关键词: 有序介孔二氧化硅, SBA-15, 硅醇基, ODC(Ⅱ), 间隙水

Abstract: An ultraviolet photoluminescence emission band at 38 eV was found from SBA-15 ordered mesoporous silica prepared by means of the hydro-thermal method. The optical properties of such material were investigated by electron paramagnetic resonance (EPR) and photoluminescence (PL) spectra at room temperature. It was found that the PL intensity of the sample at 38 eV was enhanced after exposition in air at room temperature for 10 days. Besides, annealing experiments at different temperatures were used to study the origin of the observed PL emission band. The 38 eV band is suggested to be attributed to the surface silanols generated from ODC(Ⅱ) (unrelaxed neutral oxygen vacancy) and the interstitial water molecules.

Key words: ordered mesoporous silica, SBA-15, Silanol, ODC(Ⅱ), interstitial water molecules

徐海涛，王玉霞，赵磊. 有序介孔SBA-15紫外光致发光机理研究[J]. 中国科学技术大学学报, 2010, 40(1): 58-61.

XU Haitao, WANG Yuxia, ZHAO Lei. Ultraviolet photoluminescence from SBA-15 ordered mesoporous silica[J]. Journal of University of Science and Technology of China, 2010, 40(1): 58-61.

有序介孔SBA-15紫外光致发光机理研究

Ultraviolet photoluminescence from SBA-15 ordered mesoporous silica

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