星型二苯乙烯衍生物的三光子吸收及多光子荧光发射  

Three-photon Absorption and Multiphoton Fluorescence Emission in Star-shaped Stilbene Chromophores

作　　者：钱鹰[1] 胡凯明[1] 林国强[1] 周志强[2] 崔一平[2] 

机构地区：[1]东南大学化学化工学院,南京211189 [2]东南大学先进光子学中心,南京210096

出　　处：《化学学报》2010年第18期1837-1844,共8页Acta Chimica Sinica

基　　金：国家自然科学基金(Nos.60678042;60877024);东南大学科学基金(No.9207041399)资助项目

摘　　要：用飞秒Ti:sapphire激光测定了星型二苯乙烯衍生物2,5-二{4-{2-N,N-二[4-(2-N,N-二苯基氨基苯乙烯基)苯基]氨基苯乙烯基}苯基}-1,3,4-噁二唑(DPASPO)和1,2,4,5-四(4-N,N-二苯氨基苯乙烯基)苯(PASB)的三光子吸收谱和多光子上转换荧光光谱.研究了星形八极矩分子DPASPO和PASB的线性吸收、单光子荧光及荧光寿命.在800nm波长的飞秒激光激发下,DPASPO和PASB在二氯甲烷溶液中发出很强的黄绿色双光子上转换荧光,荧光峰分别位于583nm和547nm.在1260nm波长的飞秒激光激发下,DPASPO和PASB的三光子上转换荧光峰分别位于612nm和572nm.采用非线性透过率法测得DPASPO和PASB最大三光子吸收截面分别为16.69×10-79cm6·s2和6.81×10-79cm6·s2.这些二苯乙烯衍生物的三光子吸收截面较大.在这些星型分子中,三光子吸收增强来源于二苯乙烯分支的增加,共轭体系的扩展以及分子内跨越空间电荷离域.The three-photon absorption and multiphoton upconversion fluorescence spectra of star-shaped stilbene derivatives 2,5-bis{4-{2-N,N-bis[4-（2-N,N-diphenyl-amino-phenyl-vinyl）phenyl]aminostyryl} phenyl}-1,3,4-oxadiazole （DPASPO） and 1,2,4,5-tetra（4-N,N-diphenylaminostyryl）benzene （PASB） were measured using a femtosecond Ti：sapphire laser. The absorption, one-photon fluorescence and fluorescence lifetime have been investigated. When pumped with 800 nm femtosecond laser irradiation, chromophore DPASPO and PASB show strong two-photon excited yellow green fluorescence at 583 nm and 547 nm respectively. When pumped with 1260 nm femtosecond laser, DPASPO and PASB show strong three-photon excited fluorescence at 612 nm and 572 nm in the solution of dichloromethane, respectively. Three-photon absorption cross-sections determined by nonlinear transmission method are 16.69×10^-79 cm6.s^2 （1300 nm） for DPASPO and 6.81×10 79 cm^6.s^2 （1320 nm） for PASB, respectively. These stilbene derivatives show large 3PA cross-sections. In these star-shaped chromophores, the increasing the stilbene-branched moieties and an extended n-conjugation domain, and through-space delocalization results in a increase of three photon absorption.

关 键 词：星型生色分子 三光子吸收 双光子荧光 三光子荧光 三光子吸收截面 上转换荧光 

分 类 号：O621.2[理学—有机化学]