Journal
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume 46, Issue 16, Pages 5616-5625Publisher
WILEY
DOI: 10.1002/pola.22883
Keywords
anthracene derivatives; conjugated polymers; copolymerization; electrochemistry; fluorene derivatives; fluorescence; light-emitting diodes (LED); luminescent; optics; photochemistry
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Funding
- National Natural Science Foundation of China (NSFC) [20674095]
- Chinese Academy of Sciences [KGCX2-YW-118]
- Ministry of Education of China (Shanghai University) [A.05-0408-07-003]
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A new X-shaped pi-conjugated monomer comprising of fluorene units and anthracene units was synthesized, and it was used to fabricate the new X-shaped pi-conjugated polymers and investigate the properties of the new polymers. Using different molar ratios between such monomer and a fluorene monomer gave three polymers that showed higher absolute PL quantum yields than the linear polyfluorene (PF) in the solid state. After thermal annealing at 200 degrees C for 4 h, the linear PF showed an additional bathochromic emission at about 550 nm, whereas such red-shifted emission was fully eliminated for the X-shaped polymers. The electroluminescent devices based on the X-shaped polymers with a configuration of ITO/PEDOT:PSS/polymer/LiF/Ca/Al displayed blue emission with low turn-on voltage and high brightness. (C) 2008 Wiley Periodicals, Inc.
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