Bipolar anthracene derivatives containing hole- and electron-transporting moieties for highly efficient blue electroluminescence devices
作者:Jinhai Huang、Jian-Hua Su、Xin Li、Mei-Ki Lam、Ka-Man Fung、Hai-Hua Fan、Kok-Wai Cheah、Chin H. Chen、He Tian
DOI:10.1039/c0jm03300f
日期:——
A series of bipolar anthracene derivatives containing hole-transporting triphenylamine and electron-transporting benzimidazole moieties were synthesized and characterized. These compounds possess high thermal properties and quantum yield in toluene solution but their photoluminescence spectra are sensitive to the polarity of the solvent. Three types of devices were fabricated to investigate their electron-transporting and hole-transporting as well as light-emitting properties. The electroluminescence spectra for the three derivatives B1, B3 and B4 show that they emit blue light, while the B2-based devices produced white light at a low current density because of the electromer formation. Moreover, a single layer OLED device for B4 exhibited a current efficiency of 3.33 cd A−1 with a pure blue color of CIE(x,y) of (0.16, 0.16) at 20 mA cm−2 and a maximum brightness of 8472 cd m−2 at 8.7 V.
我们合成并鉴定了一系列含有空穴传输三苯胺和电子传输苯并咪唑分子的双极蒽衍生物。这些化合物在甲苯溶液中具有较高的热性能和量子产率,但它们的光致发光光谱对溶剂的极性非常敏感。为了研究它们的电子传输、空穴传输和发光特性,我们制作了三种器件。三种衍生物 B1、B3 和 B4 的电致发光光谱显示,它们发出蓝光,而基于 B2 的器件由于形成了电致发光器,在低电流密度下产生白光。此外,B4 的单层有机发光二极管器件在 20 mA cm-2 时的电流效率为 3.33 cd A-1,CIE(x,y)为 (0.16, 0.16) 的纯蓝色,在 8.7 V 时的最大亮度为 8472 cd m-2。