A bright single layer non-doped orange-red light emitting diode using a symmetric starburst material via solution process
作者:Sheng Kong、Lixin Xiao、Yingliang Liu、Zhijian Chen、Bo Qu、Qihuang Gong
DOI:10.1039/c0nj00011f
日期:——
A symmetric starburst orange-red emitter, 2,4,6-tris((E)-2-(10-butyl-10H-phenothiazin-2-yl)vinyl)-1,3,5-triazine (TP3T) incorporating phenothiazine as the electron donor and triazine as the electron acceptor, was synthesized. It shows high fluorescence quantum yield (0.42 in toluene) because of the existence of strong intramolecular charge transfer between the phenothiazine and the triazine moieties. The smaller dipole moment for the molecule resulted from its symmetric starburst conformation and larger alkyl group substituents induce weaker interaction of molecules, thus fluorescence quenching can be effectively reduced. Owing to its bipolar structure, both hole and electron transport could be facilitated. A single layer non-doped stable orange-red emission with CIE coordinates at (0.59, 0.41) and a low turn-on voltage of 2.5 V and a maximum luminance of 2935 cd m−2 was obtained by using TP3T as the single combination layer of charge transporting and emitter via solution process.
合成了一种对称的星爆橙红色发光材料,2,4,6-三((E)-2-(10-丁基-10H-苯噻嗪-2-基)乙烯基)-1,3,5-三嗪(TP3T),其将苯噻嗪作为电子供体,三嗪作为电子受体。由于苯噻嗪和三嗪基团之间存在强的分子内电荷转移,该材料表现出高的荧光量子产率(在甲苯中为0.42)。该分子的较小偶极矩源于其对称的星爆构象,而较大的烷基取代基则导致分子间相互作用减弱,从而有效降低荧光猝灭。得益于其双极结构,既能促进孔导电,也能促进电子导电。通过将TP3T作为电荷传输和发光的单一组合层,采用溶液工艺获得了一层非掺杂的稳定橙红色发光,其CIE坐标为(0.59, 0.41),开通电压低至2.5 V,最大亮度为2935 cd m−2。