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.
Original language | English |
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Pages (from-to) | 4943-4949 |
Number of pages | 7 |
Journal | Journal of Polymer Science, Part A: Polymer Chemistry |
Volume | 48 |
Issue number | 22 |
DOIs | |
State | Published - 15 Nov 2010 |
Externally published | Yes |
Keywords
- conjugated materials
- electrochemistry
- electroluminescence
- functionalization of polymers
- light-emitting diodes (LED)
- pyrene
- star polymers
- starbursts