全反式A-D-A共轭化合物在飞秒激光下的双光子吸收性能  

Two-photon absorption properties of an all-trans acceptor-donoracceptor conjugated compound under femtosecond laser excitation

作　　者：蔡志彬[1] 黄久强 金梵 

机构地区：[1]浙江工业大学化学工程学院,浙江杭州310014

出　　处：《光电子．激光》2014年第12期2305-2309,共5页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(21103151);浙江省重点科技创新团队(2010R50018)资助项目

摘　　要：设计并合成了全反式A-D-A(acceptor-donor-acceptor)共轭化合物(Ⅰ)(E,E)-2,2′-[(2,5-二甲氧基-1,4-亚苯基)二-2,1-亚乙烯基]双-1 H-苯并咪唑。用傅里叶变换红外光谱、核磁共振氢谱、质谱和元素分析进行了Ⅰ的结构表征;测定了Ⅰ在不同溶剂中的线性吸收光谱、单光子荧光(SPEF)光谱和荧光量子产率;采用800nm的飞秒激光,研究了Ⅰ的双光子吸收(TPA)和双光子荧光(TPEF)性能。结果表明:随着溶剂极性的增大,Ⅰ的线性吸收波长变化很小,SPEF发射波长红移,荧光量子产率下降;Ⅰ在四氢呋喃(THF)中的荧光量子产率高达0.93,TPA截面为204×10-50 cm4·s·photon-1,具有强的蓝绿色TPF发射。Two-photon absorption （TPA） materials have shown good application prospects in many fields,including three-dimensional optical data storage, three-dimensional microfabrication, fluorescence imaging, fluorescent microscopy, frequency UlyConverted lasing, optical power limiting and photodynamic therapy,and have become the world-wide frontier and focus in the research of photoelectric functional materials currently. An all-trans acceptor-donor-acceptor （A-D-A） compound （E,E）-2,2C[（2,5- dime- thoxy-1,4-phenylene） di-2, 1-ethenediyl]bis-1H-benzimidazole is designed and synthesized. Its structure is characterized using Fourier transform infrared and hydrogen nuclear magnetic resonance spectroscopy, mass spectrometry,and elemental analysis. The linear absorption spectra, single-photon excited fluorescence spectra,and fluorescence quantum yields are measured in different solvents. The two-photon ab sorption and two-photon fluorescent properties are studied using a femtosecond 800 nm laser. The results show that with increasing solvent polarity, the linear absorption wavelengths do not vary significantly, the single-photon excited fluorescence wavelengths show bathochromic shifts, and the fluorescence quantum yields decrease. Its fluorescence quantum yield in tetrahydrofuran is 0. 93, the two-photon absorption cross-sections is 204 × 10^-50 cm^4 · s · photon^-1 ,and it exhibits strong blue-green two-photon fluorescence.

关 键 词：A-D-A(acceptor-donor-acceptor)共轭化合物(Ⅰ) 合成 双光子吸收(TPA) 双光子荧光(TPEF) 

分 类 号：O437[机械工程—光学工程]