A series of linear, symmetrical, diphenylaminofluorene-based materials are reported. The series investigated was model 9,9-didecyl-2,7-bis(N,N-diphenylamino)fluorene (1), oligomer 9,9-didecyl-N,N-bis(9,9-didecyl-7-N,N-diphenylaminofluoren-2-yl)-N,N-diphenyl-fluorene-2,7-diamine (2), and poly(9,9-didecyl-2,7-diphenylaminofluorene) (3). Structural characterization and photophysical properties, including linear absorption, quantum yields, single photon fluorescence, and two-photon absorption (2PA) spectra, were studied in polar and nonpolar solvents. 2PA spectra were determined by two independent methods:  a nonlinear transmission method employing a femtosecond white-light continuum (WLC) and a two-photon fluorescence (2PF) method. Polymer 3, a low-molecular-weight polymer with fourteen fluorene units, exhibited a very large two-photon absorption cross-section of 17 200 and 6800 × 10^-50 cm⁴ s photon^-1 molecule^-1 as estimated from the WLC and 2PF methods, respectively.

中文翻译：

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一系列对称的二苯基氨基芴的线性和双光子光物理性质

报道了一系列线性，对称的二苯基氨基芴基材料。研究的系列是模型9,9-二癸基-2,7-双（N，N-二苯氨基）芴（1），低聚物9,9-二癸基-N，N-双（9,9-二癸基-7- N，N-二苯基氨基芴-2-基）-N，N-二苯基芴-2,7-二胺（2）和聚（9,9-二癸基-2,7-二苯基氨基芴）（3）。在极性和非极性溶剂中研究了结构表征和光物理性质，包括线性吸收，量子产率，单光子荧光和双光子吸收（2PA）光谱。2PA光谱是通过两种独立的方法确定的：使用飞秒白光连续体（WLC）的非线性透射方法和双光子荧光（2PF）方法。聚合物3，具有14个芴单元的低分子量聚合物，表现出17 200和6800×10非常大的双光子吸收横截面^{- 50}厘米⁴小号光子^{- 1个}分子^{- 1}从WLC估计和分别采用2PF方法。