期刊
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
卷 48, 期 22, 页码 4943-4949出版社
WILEY
DOI: 10.1002/pola.24289
关键词
conjugated materials; electrochemistry; electroluminescence; functionalization of polymers; light-emitting diodes (LED); pyrene; starbursts; star polymers
资金
- 973 project [2009CB930600]
- NNSFC [90406021, 20904023, 60578039, 20704023, 60876010, 60706017, 20774043]
- Chinese Ministry of Education [104246, 208050, 707032]
- NSF of Jiangsu Province [BK2008053, SJ209003, TJ209035]
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). (C) 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 4943-4949, 2010
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