π-Conjugated Copolymers Composed of Boron Formazanate and Their Application for a Wavelength Converter to Near-Infrared Light
π-Conjugated Copolymers Composed of Boron Formazanate and Their Application for a Wavelength Converter to Near-Infrared Light
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DOI：
10.1021/acs.macromol.0c02315
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发表时间：
2021-02-11
期刊：
影响因子：
5.5
通讯作者：
Chujo, Yoshiki
中科院分区：
文献类型：
--
作者：
Kawano, Yuki;Ito, Yoshinori;Chujo, Yoshiki
我们报道了主链中含有硼甲亚胺的共轭聚合物。采用典型的给体型共聚单体，如芴和联噻吩，用Migita-Kosugi-Stille交叉偶联聚合制备共聚物。通过光学和电化学测量评估了它们的电子结构。在深红色和近红外（NIR）区域获得吸收和发射带。特别是由甲酰胺和芴组成的共轭聚合物，在751 nm处显示出显著的近红外发射，绝对量子产率为0.14。此外，硼甲锌在主链共轭中作为强电子接受单元起作用。因此，从聚合物的发射具有分子内电荷转移的字符。最后，我们展示了部分改性聚合物的波长转换材料从可见光到近红外光的应用。通过改变聚合物主链中的络合比，获得了覆盖整个可见光区的宽吸收带和单一的近红外发射带。因此，已经构建了用于可见光吸收之后的近红外发射的方案。
We report conjugated polymers consisting of boron formazanate in the main chains. By employing typical donor-type comonomers, such as fluorene and bithiophene, copolymers were prepared with the Migita-Kosugi-Stille cross-coupling polymerization. Their electronic structures were evaluated by optical and electrochemical measurements. Absorption and emission bands were obtained in the deep-red and near-infrared (NIR) regions. A conjugated polymer composed of formazanate and fluorene, especially, exhibited remarkable NIR emission at 751 nm with 0.14 of absolute quantum yield. Further, boron formazanate works as a strong electron-accepting unit in main-chain conjugation. Therefore, emission from the polymers has the intramolecular charge transfer character. Finally, we demonstrate the application for wavelength-conversion materials from visible to NIR light based on partially modified polymers. By changing complexation ratios in the polymer main chains, broad absorption bands covering the whole visible region and the single NIR emission band were obtained. As a result, the scheme for visible light absorption followed by the NIR emission has been constructed.