摘要
设计、合成并用红外光谱、1HNMR、元素分析表征了三种用于双光子吸收材料的二苯乙烯衍生物，4，4＇-双（二苯氨基一反式一苯乙烯基）联苯（BPSBP），4，4＇-双（二乙氨基一反式一苯乙烯基）联苯（BESBP）和4，4，-双（9一咔唑基一反式一苯乙烯基）联苯（BCSBP）。实验结果表明三者最强的单光子吸收出现在350-400nm之间，且单光子吸收和荧光光谱中表现出明显的溶剂化显色效应，揭示了分子内对称电荷转移的本质，双光子荧光光谱则揭示了单光子和双光子吸收具有相同的发射机理。利用双光子上转换荧光法测试发现，三种双光子吸收材料在800nm飞秒激光的激发下具有较大的吸收截面，分别为892，617和483GM，这表明在双光子领域有潜在的应用价值。
Three stilbene derivatives with good coplanarity and enhanced charge delocalization in the conjugated molecular system, 4,4＇-bis（diphenylamino-trans-styryl） biphenyl （BPSBP）, 4,4＇-bis （diethylamino-trans-styryl） biphenyl （BESBP） and 4,4＇- bis（9-carbazyl-trans-styryl）-biphenyl （BCSBP）, were designed, synthesized and characterized by infra-red spectroscopy, hydrogen nuclear magnetic resonance and elemental analysis. Experimental results reveal that the strongest one-photon absorption peaks appear between 350 and 400 nm, which is the energy region of two near infrared photons. The obvious solvatochromism was observed in five different polar solvents and the corresponding one-photon absorption and fluorescence emission spectra vali- date the character of intramolecular symmetric charge transfer. Two-photon fluorescence spectra show that both one- and two- photon processes share the same emission mechanism although they have different excitation processes and selection rules. The quadratic dependence of fluorescence intensity on excitation intensity indicates a real two-photon absorption process. The two- photon absorption cross section was measured via two-photon induced upconversion fluorescence method. The large values of two-photon absorption cross section, 892 GM, 617 GM and 483 GM for BPSBP, BESBP and BCSBP respectively, were obtained at 800 nm wavelength from a femtosecond laser source, which means potential applications in two-photon absorption fields.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2009年第9期2462-2466,共5页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(90201016)
河南省科技厅科技攻关项目(082102340026)
河南省教育厅自然科学基金项目(2008B430015,2009B430009)资助
关键词
二苯乙烯衍生物
双光子吸收
上转换荧光
吸收截面
Stilbene derivatives
Two-photon absorption
Upconvertion fluorescence
Cross-section
作者简介
作者简介：郭福全，1975年生，洛阳理工学院材料科学与工程系副教授e-mail：fqgzl@ustc．edu
