Multicolor fluorescence and electroluminescence of an ICT-type organic solid tuned by modulating the accepting nature of the central core
Multicolor fluorescence and electroluminescence of an ICT-type organic solid tuned by modulating the accepting nature of the central core
复制标题
通过调节中心核的接受性质来调节 ICT 型有机固体的多色荧光和电致发光
DOI：
10.1039/c3sc51091c
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发表时间：
2013-01-01
期刊：
影响因子：
8.4
通讯作者：
Wang, Yue
中科院分区：
文献类型：
--
作者：
Wang, Kai;Huang, Shuo;Wang, Yue
已采用供体-受体-供体（D-A-D）分子二（三苯胺）-噻唑并噻唑1，其中中心路易斯碱性氮原子促使其在溶液和固体状态下对强酸响应。其结果是，受电子强度和分子内电荷转移（ICT）特性可以可控地增强，使1的发射带顺序红移。该绿色发光固体（524 nm）在分别用HCl、TFA和刘易斯酸BBr 3蒸发后可以平滑地转变为黄色（576 nm）、红色（640 nm）和近红外（739 nm）发射状态，具有215 nm的巨大Δ λ（em）。利用1对酸敏感的特性，首次制备了基于中性和质子化物种的热蒸发有机电致发光器件，并获得了高亮度和中等电流效率的电致发光。因此，在我们所知的范围内，首次实现了基于单一有机生色团的单光子光致发光和热蒸发电致发光。
A donor-acceptor-donor (D-A-D) molecule di(triphenylamine)-thiazolothiazole 1 has been employed in which the central Lewis-basic nitrogen atoms prompt it to be responsive to strong acids in both solution and solid states. As a result, the electron-accepting strength and intramolecular charge transfer (ICT) character can be controllably enhanced which make the emission band of 1 sequentially red-shift. The green luminescent solids (524 nm) can be smoothly transferred into yellow (576 nm), red (640 nm), and near infrared (739 nm) emissive states with a huge Delta lambda(em) of 215 nm after being evaporated by HCl, TFA, and Lewis acid BBr3, respectively. Taking advantage of the smart sensitivity of 1 to acids, we prepared thermal-evaporated OLEDs based on the neutral and protonated species for the first time and achieved multicolor electroluminescence (EL) with very high brightness and moderate current efficiency. Thus, multicolor photoluminescence and thermally evaporated electroluminescence have been firstly realized based on a single organic chromophore, to the best of our knowledge.