Naito Hirofumi, Nishino Kenta, Morisaki Yasuhiro, Tanaka Kazuo, Chujo Yoshiki
Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan.
Present address: Department of Applied Chemistry for Environment, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo, 669-1337, Japan.
Chem Asian J. 2017 Aug 17;12(16):2134-2138. doi: 10.1002/asia.201700815. Epub 2017 Jul 11.
Aryl-substituted o-carboranes have shown highly efficient solid-state emission in previous studies. To demonstrate color tuning of the solid-state emission in an aryl-o-carborane-based system, bis-o-carborane-substituted oligoacenes were synthesized and their properties were systematically investigated. Optical and electrochemical measurements revealed efficient decreases in energy band gaps and lowest unoccupied molecular orbital (LUMO) levels by adding a number of fused benzene rings for the extension of π-conjugation. As a consequence, bright solid-state emission was observed in the region from blue to near infrared (NIR). Furthermore, various useful features were obtained from the modified o-carboranes as an optical material. The naphthalene derivatives exhibited aggregation-induced emission (AIE) and almost 100 % quantum efficiency in the crystalline state. Furthermore, it was shown that the tetracene derivative with NIR-emissive properties had high durability toward photo-bleaching under UV irradiation.
芳基取代的邻碳硼烷在先前的研究中已显示出高效的固态发光。为了证明基于芳基-邻碳硼烷体系的固态发光颜色可调，合成了双邻碳硼烷取代的并苯，并对其性质进行了系统研究。光学和电化学测量表明，通过添加多个稠合苯环以扩展π共轭，能带隙和最低未占据分子轨道（LUMO）水平有效降低。结果，在从蓝色到近红外（NIR）的区域中观察到明亮的固态发光。此外，从改性邻碳硼烷作为光学材料获得了各种有用的特性。萘衍生物表现出聚集诱导发光（AIE），并且在结晶状态下具有几乎100％的量子效率。此外，还表明具有近红外发射特性的并四苯衍生物在紫外线照射下对光漂白具有高耐久性。
