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首页> 外文期刊>Dyes and Pigments >Impact of donor-acceptor alternation on optical power limiting behavior of H-Shaped thiophene-imidazo [2,1-b] [1,3,4]thiadiazole flanked conjugated oligomers
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Impact of donor-acceptor alternation on optical power limiting behavior of H-Shaped thiophene-imidazo [2,1-b] [1,3,4]thiadiazole flanked conjugated oligomers

机译：供体 - 受体交替对H形噻吩-Imidazo的光功率限制行为的影响[2,1- b] [1,3,4]噻二唑侧缀合的低聚物

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摘要

A new series of four D-A-D configured conjugated oligomers with H-type structure, possessing two thinphene-imidazo [2,1-b][1,3,4]thiadiazole branches and thiophene (TIT), thiophene-1,3,4-oxadiazole-thiophene (TITO), thiazolo [5,4-(1)thiazole (TITz), phenyl-thiazolo [5,4-d]thiazole-phenyl (TIPTz) units as central core moieties were efficiently synthesized. These core moieties were specifically selected to increase the planarity, rigidity, stability, extend the pi-conjugation and to understand the influence of central core on nonlinear absorption coefficient (beta(eff)) and optical limiting behavior of the synthesized oligomers. The structure-property relationships of these oligomers were established by the optical absorption (UV-Vis), electrochemical (CV) and theoretical (DFT) studies. The "effective two-photon absorption" of oligomers was confirmed by single-beam Z-scan analysis. The exceptional increase in nonlinear response was achieved with the oligomers TITO and TIPTz with nonlinear absorption coefficient (beta(eff)) of 1.62 and 2.71 x 10(-10) m W-1, and limiting thresholds of 6.02 and 3.14 J cm(-2), respectively, which suggest that these oligomers could be potent materials for practical applications in laser photonics.
机译：一种新的四种爸爸配置的共轭低聚物，具有H型结构，具有两种苯甲酸亚咪唑[2,1-b] [1,3,4]噻二唑枝和噻吩（山雀），噻吩-1,3,4-噻二唑噻吩（丙二），噻唑洛[5,4-（1）噻唑（TIAZ），苯基 - 噻唑[5,4-D]噻唑 - 苯基（TIPTZ）单位作为中央核心部分被有效地合成。这些核心部分被特别选择以增加平面，刚性，稳定性，延伸PI缀合，并了解中枢核对非线性吸收系数（β（EFF））的影响和合成的低聚物的光学限制行为。通过光学吸收（UV-VI），电化学（CV）和理论（DFT）研究建立了这些低聚物的结构性质关系。通过单束Z扫描分析证实了低聚物的“有效的双光子吸收”。使用1.62和2.71×10（-10）m W-1的非线性算子和Tiptz实现非线性反应的特殊增加，并限制了6.02和3.14J厘米的限制阈值（ - 2）分别表明这些低聚物可以是激光光子学中实际应用的有效材料。

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