电致发光
咔唑
循环伏安法
芘
阳极
电化学
有机发光二极管
图层(电子)
材料科学
轨道能级差
分析化学(期刊)
荧光
亮度
光化学
化学
电极
分子
纳米技术
光学
有机化学
物理化学
物理
作者
Feng Liu,Jianhua Zou,Qiyuan He,Chao Tang,Linghai Xie,Bo Peng,Wei Wei,Yong Cao,Wei Huang
摘要
Abstract Carbazole end‐capped starburst molecule based on pyrene core “4CzFP” was synthesized and characterized. The starburst material shows good film‐forming ability and bright blue fluorescence. In cyclic voltammetry test, 4CzFP shows a high highest occupied molecular orbital energy level of −5.26 eV, indicating it has good hole‐injection ability. The material is quite stable under series of cyclic voltammetry scans, implying its good electrochemical stability. Single‐layered electroluminescent device takes on stable blue emission with a peak current efficiency of 0.84 cd/A. Double‐layered device by adding Poly( N ‐vinylcarbazole) (PVK) as a hole‐injection layer does not show any improvement, indicating that 4CzFP could be efficiently used as the hole‐injection/light‐emitting layer. The device performance is largely improved by adding a thin TPBI electron‐injection/transporting layer. The peak efficiency reaches 3.28 cd/A and the maximum brightness is over 2200 cd/m 2 . © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010
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