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首页> 外文期刊>Chemistry: A European journal >Novel 2,1,3-benzothiadiazole-based red-fluorescent dyes with enhanced two-photon absorption cross-sections
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Novel 2,1,3-benzothiadiazole-based red-fluorescent dyes with enhanced two-photon absorption cross-sections

机译：具有增强的两光子吸收截面的新型2,1,3-苯并噻二唑基红色荧光染料

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This paper reports the two-photon absorbing and orange-red fluorescence emitting properties of a series of new 2,1,3-benzothiadiazole (BTD)-based D-pi-A-pi-D-type and star-burst-type fluorescent dyes. In the D-pi-A-pi-D-type dyes 1-6, a central BTD core was connected with two terminal N,N-disubstituted amino groups via various pi-conjugated spacers. The star-burst-type dyes 8 and 10 have a three-branched structure composed of a central core (benzene core in 8 and triphenylamine core in 10) and three triphenylamine-containing BTD branches. All the BTD-based dyes displayed intense orange-red color fluorescence in a region of 550-689 nm, which was obtained by single-photon excitation with good fluorescent quantum yield up to 0.98 as well as by two-photon excitation. Large two-photon absorption (TPA) cross-sections (110-800 GM) of these BTD dyes were evaluated by open aperture Z-scan technique with a femtosecond Ti/sapphire laser. The TPA cross-sections of D-pi-A-pi-D-type dyes 2-6 with a benzene, thiophene, ethene, ethyne, and styrene moiety, respectively, as an additional pi-conjugated spacer are about 1.5-2.5 times larger than that of 1c with only a benzene spacer. The TPA cross-sections significantly increased in three-branched star-burst-type BTDs 8 (780 GM) with a benzene core and 10 (800 GM) with a triphenylamine core, which are about 3-5 times larger than those of the corresponding one-dimensional sub-units 9 (170 GM) and 11 (230 GM), respectively. The ratios of sigma/ e, between three-branched and one-dimensional dyes were 6.5:3.8 (for 8 and 9) and 6.0:4.0 (for 10 and 11), which are larger than those predicted simply on the basis of the chromophore number density (1:1), according to a cooperative enhancement of the two-photon absorbing nature in the three-branched system.
机译：本文报道了一系列新的基于2,1,3-苯并噻二唑（BTD）的D-pi-A-pi-D型和星爆型荧光粉的双光子吸收和橙红色荧光发射特性染料。在D-pi-A-pi-D-型染料1-6中，中央BTD核通过各种π-共轭的间隔基与两个末端的N，N-二取代的氨基连接。星暴型染料8和10具有由中心核（8个苯核和10个三苯胺核）和三个含三苯胺的BTD分支组成的三分支结构。所有基于BTD的染料在550-689 nm区域均显示出强烈的橙红色荧光，这是通过单光子激发获得的，具有高达0.98的良好荧光量子产率以及通过双光子激发而获得。这些BTD染料的大两光子吸收（TPA）截面（110-800 GM）通过飞秒Ti /蓝宝石激光器的开孔Z扫描技术进行了评估。 D-pi-A-pi-D-型染料2-6的TPA截面分别带有苯，噻吩，乙烯，乙炔和苯乙烯部分，作为附加的pi共轭间隔基，约为1.5-2.5倍仅使用苯间隔基比1c大。具有苯核的三分支星爆型BTD 8（780 GM）和具有三苯胺核的10（800 GM）的TPA横截面显着增加，比相应的大约3-5倍一维子单元9（170 GM）和11（230 GM）。三支和一维染料之间的sigma / e之比为6.5：3.8（对于8和9）和6.0：4.0（对于10和11），这比仅根据生色团预测的值大数密度（1：1），这是根据三分支系统中双光子吸收性质的协同增强而得出的。

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