【作者】 郭晓稚；

【导师】 杨平； 王筱梅；

【作者基本信息】 苏州大学 ， 物理化学， 2005， 硕士

【摘要】 具有整体共轭大π键的有机分子在适当条件下具有较强的分子内电荷转移,不仅表现出强的荧光发射能力,还表现出如双光子吸收、上转换发射等独特的光电性质。本文首次合成了三个具有大共轭范围的新型有机发光分子:2,8-双-[（2-（4’-乙氧基苯基）-5-（4’-苯乙烯基）-1,3,4-（口恶）二唑）二苯并噻吩（SO-G1）、2,8-双（4’-三苯氨基乙烯基）-N-乙基氮杂芴（NT-G1）和2,8-双[2-（4’-乙氧基苯基）-5-（4’-苯乙烯基）-1,3,4-（口恶）二唑]-N-乙基氮杂芴（NO-G1）。并研究了它们的发光性能。结果表明: （1）NO-G1的单、双光子的吸收峰位随着溶剂极性的增大发生依次红移。而SO-G1仅其单光子荧光最大荧光发射波长随溶剂极性增大明显红移。 （2）双光子吸收截面(δ_TPA):NT-G1的双光子吸收截面为215GM,而NO-G1和SO-G1的双光子吸收截面分别为454GM和377GM。发色团NO-G1比SO-G1表现出更高的δ_TPA,由于它具有“D-A-D’-A-D”pn结模式特征。计算结果表明,刚性共轭中心核的供电子能力在电荷重新分配方面更有利。 本文首次选用八氨基苯立方硅氧烷为“核”,利用席夫碱反应合成了八（4—硝基苯甲醛缩苯氨基）立方硅氧烷（OPASDX）和八（4-N,N—二甲基苯甲醛缩苯氨基）立方硅氧烷（OAPSNN）,对其进行了紫外一可见、单光子荧光等表征。结果表明: （1）立方硅氧烷及其衍生物在紫外一可见的吸收表现为:随着物质共轭度的增大,吸收强度增大。 （2）OPASDX和OAPSNN的荧光强度明显高于相应的席夫碱分子。表明生色基团与八氨基苯立方硅氧烷接枝后降低了分子间“凝聚作用”,提高了分子发光性能。更多还原

【Abstract】 Three novel chromophores: 2,8-Bis-[（2-4’-ethoxyl phenyl-5-4’-styryl）-l,3,4-oxadiazole] didibenzothiophene （abbreviated as SO-G₁）, 2,8-bis（4-vinyl triphenylamino）-N-ethyl carbazole （abbreviated as NT-G1） and 2,8-Bis-[（2-4’-ethoxyl phenyl-5-4’-styryl）-l,3,4-oxadiazole]-N -ethyl carbazole （abbreviated as NO-G₁） have been synthesized. Photoluminescence properties and two-photon fluorescence of these three compounds in different solvents have been investigated.（1） The three chromophores have strong emissive ability of fluorescence.（2） TPA cross-section (δ_TPA) The largest δ_TPAof NT-G1 is 215GM, however, δ_TPA is as high as 454GM for NO-G1 and 377GM for SO-G1. Indicating that electron donating ability of rigid conjugated central core may have more effective in enhancement of charge redistribution.Two new molecules were synthesized using octa（aminophenyl）silsesquioxane as core and benzaldehydes as chromophores. The optical properties of the two molecules were investigated.（1） The absorbance intensities of UV-Vis spectra of two molecules increase with the increasing conjugated degree of the molecules.（2） The fluorescent intensities of two dendrimers are obviously stronger than the ones of the relative chromophores, which can be attributed to the effect of non-aggregation of molecules in the solution.更多还原