双叔丁基苯并噁唑噻酚在多孔二氧化硅中发光的研究

doi:10.3964/j.issn.1000-0593(2009)07-1740-05

CORC > 北京大学 > 化学与分子工程学院

	双叔丁基苯并噁唑噻酚在多孔二氧化硅中发光的研究; Photoluminescence from Bis-t-Butylbenzoxazolylthiophene Doped Silica Films
	王俊玲 ; 何志群 ; 王永生 ; 穆林平 ; 叶柿 ; 荆西平
刊名	光谱学与光谱分析
	2009
关键词	2,5-双(5-叔丁基-1,3-苯并噁唑-2-基)噻酚纳米多孔二氧化硅浓度猝灭荧光光致发光 BBOT 2,5-bis(5-tert-butyl-2-benzoxazolyl) thiophene BBOT Nano-pore silica Concentration quenching Fluorescence Photoluminescence
DOI	10.3964/j.issn.1000-0593(2009)07-1740-05
英文摘要	利用溶胶凝胶法制备了用有机荧光染料2,5-双(5-叔丁基-1,3-苯并嗯唑-2-基)噻酚(2,5-bis(5-tertbutyl-2-benzoxazolyl)thiophene,BBOT)的高浓度掺杂的纳米多孔二氧化硅固态薄膜,该薄膜呈现明亮的蓝色发光.通过紫外-可见光谱、瞬态-稳态荧光光谱、光学显微镜技术的研究表明:(1)在掺杂浓度低于6×10-3 mol·L-1时,薄膜中荧光染料BBOT的光强比值随浓度呈线性增加;(2)在掺杂浓度低于6×10-3 mol·L-1时,显微镜观察可见薄膜发光均匀、没有相分离产生;(3)固体薄膜中分子的荧光寿命比在1,4二氧六环稀溶液中的1.957 ns延长.在掺杂浓度为6×10-3 mol·L-1的样品中随着凝胶化程度逐渐升高荧光寿命从固化温度为50℃样品的2.45 ns提高到固化温度为90℃样品的3.04 ns.在掺杂浓度高达6×10-3 mol·L-1时,该体系并不产生分子荧光的浓度猝灭.通过对比固态掺杂体系中和相同浓度下1,4二氧六环溶液中BBOT的荧光寿命随浓度和二氧化硅体系凝胶化程度变化的规律,发现多纳米孔二氧化硅基质可以有效地抑制BBOT荧光的浓度猝灭,获得了具有稳定荧光的有机无机杂化材料.; Thin nano-porous silica films doped with high concentrations of fluorescent material, 2, 5-bis(5-tert-butyl-2-benzoxazolyl)-thiophene (BBOT) were prepared via a sol-gel process. Uniform and bright blue fluorescence was observed. Light emission properties of these organic molecule doped inorganic silica films, i.e., hybrid films, were measured using ultraviolet-visible (UV-Vis) absorption spectroscopy, steady and time-resolved fluorescence spectroscopy as well as optical microscopy. Features of these materials were revealed in this investigation: Firstly, photoluminescence intensity from BBOT doped silica films increased linearly as the concentrations of BBOT increased if the dopant concentration was relatively low and below 6 ?? 10-3 mol·L-1; Secondly, no molecular aggregation or phase separation was observed using optical microscopy when the BBOT concentration was below 6 ?? 10-3 mol·L-1 in BBOT doped silica films. Thirdly, the fluorescence lifetimes of BBOT in the doped silica films were longer than that in a dilute dioxane solution (1.957 ns), which was contradicted to our general understanding that the fluorescence lifetime may be reduced in a condensed matter due to molecular interactions or quenching. It was further found that the fluorescence lifetime also varied with the gelation conditions. Taking a BBOT concentration of 6 ?? 10-3 mol·L-1 for an example, the lifetime of BBOT in doped silica films was about 2.45 ns for a specimen polymerized at 50??C; while the lifetime was increased to 3.04 ns for a specimen polymerized at 90??C. This work demonstrates no concentration quenching when the BBOT dopant concentrations increased to as high as 6 ?? 10-3 mol·L-1 in the silica matrix. In comparison with the changes in time-resolved photoluminescence of BBOT in dioxane solution and that of the BBOT doped nano-porous silica in relation to their concentration dependence and the gelation conditions, it was found that concentration quenching can be effectively suppressed by the nano-porous silica matrix. A stable fluorescent organic-inorganic hybrid material is thus obtained.; 国家自然科学基金; 国家重点基础研究发展规划(973计划); 北京市重点实验室开放课题; 北京交通大学科学基金; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000267632100004&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; SCI(E); EI; 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 0; 7; 1740-1744; 29
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/247118]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	王俊玲,何志群,王永生,等. 双叔丁基苯并噁唑噻酚在多孔二氧化硅中发光的研究, Photoluminescence from Bis-t-Butylbenzoxazolylthiophene Doped Silica Films[J]. 光谱学与光谱分析,2009.
APA	王俊玲,何志群,王永生,穆林平,叶柿,&荆西平.(2009).双叔丁基苯并噁唑噻酚在多孔二氧化硅中发光的研究.光谱学与光谱分析.
MLA	王俊玲,et al."双叔丁基苯并噁唑噻酚在多孔二氧化硅中发光的研究".光谱学与光谱分析 (2009).