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首页> 外文期刊>Chemistry: A European journal >Donor-Acceptor Interactions in Red-Emitting Thienylbenzene-Branched Dendrimers with Benzothiadiazole Core
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Donor-Acceptor Interactions in Red-Emitting Thienylbenzene-Branched Dendrimers with Benzothiadiazole Core

机译：苯并噻二唑核的红色噻吩支链树枝状大分子中的供体-受体相互作用

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摘要

Synthesis and characterization of dendrimers containing thienylbenzene repeating units, red-emitting benzothiadiazole core, and triarylamine peripheries that bear naphthyl units are reported. The relevant dendrimers of different generations are classified as G(nb) (n = 1-3), while the tert-butyl dendrimers G(na) with the acceptor alone were also synthesized to serve as control chromophores that avoid donor-acceptor interactions. The resulting dendrimers are capable of harvesting photon energy through efficient energy transfer among donor-acceptor moieties, so that highly luminescent red fluorophores result. Transient fluorescence studies suggest that the energy transfer and its efficiency are approximately unity in all G(n) dendrimers, whereas the rate of energy transfer for the G(b) dendrimers is suppressed, that is, charge transfer from the core to the periphery is a significant quenching pathway. These dendrimers are amorphous in nature with high glass transition temperatures (176-201 degrees C). Electroluminescent devices were fabricated by using the dendrimers as hole-transporting emitters, and the devices exhibit promising red emission parameters.
机译：据报道，包含噻吩基苯重复单元，发红光的苯并噻二唑核心和带有萘基单元的三芳基胺周边的树枝状聚合物的合成和表征。不同世代的相关树枝状大分子被分类为G（nb）（n = 1-3），而仅带有受体的叔丁基树枝状大分子G（na）也被合成为可避免供体-受体相互作用的生色团。所得的树枝状聚合物能够通过在供体-受体部分之间进行有效的能量转移来收集光子能量，从而产生高发光度的红色荧光团。瞬态荧光研究表明，在所有G（n）树枝状大分子中，能量转移及其效率近似统一，而G（b）树枝状大分子的能量转移速率受到抑制，即，电荷从核向外围转移显着的淬灭途径。这些树枝状聚合物本质上是无定形的，具有高的玻璃化转变温度（176-201摄氏度）。通过使用树枝状聚合物作为空穴传输发射体来制备电致发光器件，并且该器件表现出有希望的红色发射参数。

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