Naphthalene-substituted 2,3,4,5-tetraphenylsiloles: synthesis, structure, aggregation-induced emission and efficient electroluminescence
作者:Tao Jiang、Yibing Jiang、Wei Qin、Shuming Chen、Yahong Lu、Jacky W. Y. Lam、Bairong He、Ping Lu、Herman H. Y. Sung、Ian D. Williams、Hoi Sing Kwok、Zujin Zhao、Huayu Qiu、Ben Zhong Tang
DOI:10.1039/c2jm34621d
日期:——
Two thermally stable naphthalene-substituted 2,3,4,5-tetraphenylsiloles, 1,1-dimethyl-2,5-bis[4-(naphthalen-1-yl)phenyl]-3,4-diphenylsilole (D-1-NpTPS) and 1,1-dimethyl-2,5-bis[4-(naphthalen-2-yl)phenyl]-3,4-diphenylsilole (D-2-NpTPS), have been synthesized and fully characterized. D-2-NpTPS shows redder absorption and emission than D-1-NpTPS due to the better conjugation between naphthalen-2-yl groups and phenyl rings at the 2,5-positions of the silole core. While they are weakly fluorescent in solutions, strong luminescence is induced when aggregated in poor solvents or fabricated into solid films, with high fluorescence quantum yields up to 99%, demonstrating their aggregation-induced emission (AIE) feature. Efficient non-doped organic light-emitting diodes utilizing D-1-NpTPS and D-2-NpTPS as light-emitting layers are fabricated. Remarkably high electroluminescence efficiencies of 10.5 cd A−1, 7.3 lm W−1, and 3.2% are acheived by the D-2-NpTPS device.
我们合成了两种热稳定的萘取代 2,3,4,5- 四苯基硅烯,即 1,1-二甲基-2,5-双[4-(萘-1-基)苯基]-3,4-二苯基硅烯(D-1-NpTPS)和 1,1-二甲基-2,5-双[4-(萘-2-基)苯基]-3,4-二苯基硅烯(D-2-NpTPS),并对其进行了全面表征。与 D-1-NpTPS 相比,D-2-NpTPS 显示出更红的吸收和发射,这是因为萘-2-基团与硅ole 核心 2,5 位上的苯基环之间的共轭作用更好。虽然它们在溶液中的荧光很弱,但在贫溶剂中聚集或制成固体薄膜时会诱发强荧光,荧光量子产率高达 99%,这证明了它们的聚集诱导发射(AIE)特性。利用 D-1-NpTPS 和 D-2-NpTPS 作为发光层,制造出了高效的非掺杂有机发光二极管。D-2-NpTPS 器件的电致发光效率高达 10.5 cd A-1、7.3 lm W-1 和 3.2%。