employing a Ti:sapphire femtosecond laser pulse. The dendrimers both emit strong blue–green fluorescence under irradiation. Two-photon excited state fluorescence cross-sections were also obtained. The two dendrimers displayed a large two-photon absorption. The polytriphenylamine dendrimer shows larger two-photon excited state fluorescence cross-sections in toluene relative to the tristriphenylamine analog
合成了新型的基于
三苯胺的树枝状聚合物,并通过FT-IR进行了表征,元素分析,11 H NMR光谱和MALDI-TOF质谱。研究了线性光物理性质,包括吸收,单光子诱导的荧光以及在不同溶剂中的荧光寿命。使用Ti:蓝宝石飞秒激光脉冲在
甲苯溶液中记录了双光子诱导的荧光行为。树枝状大分子在辐照下均发出强烈的蓝绿色荧光。还获得了双光子激发态荧光截面。两种树枝状聚合物显示出大的两光子吸收。相对于三三苯
胺类似物,聚
三苯胺树状聚合物在
甲苯中显示出更大的双光子激发态荧光截面,