期刊
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
卷 48, 期 17, 页码 3868-3879出版社
WILEY
DOI: 10.1002/pola.24173
关键词
binaphthol; chiral; chirality; conjugated polymers; highly stable blue-light-emission; light-emitting diodes (LED); stabilization; structure-property relations
资金
- National Basic Research Program of China (973 Program) [2009CB930601]
- National Natural Science Foundation of China [20804020, 60976019, 20974046]
- Program for New Century Excellent Talents in University [NCET-07-0446]
- Natural Science Foundation of Jiangsu College Council [08KJB150012]
- Scientific and Technological Innovation Teams of Colleges and Universities in Jiangsu Province [TJ207035]
- Nanjing University of Posts and Telecommunications [NY207161]
In a quest for the main-chain chiral and highly stable blue-light-emitting pi-conjugated polymers, a novel series of soluble conjugated random and alternating copolymers (PF-BN) derived from fluorene and axially chiral 1,1'-binaphthol (BINOL) were successfully synthesized by Suzuki coupling polymerization. The polymer structures, optical properties, and their electrochemical properties were investigated by H-1 NMR, TGA/DSC, UV-Vis absorption, photoluminescence, cyclic voltammetry, circular dichroism spectroscopy, and DFT calculations. The blue-light-emitting BINOL-containing copolymers with proper content of BINOL show highly efficient photoluminescence and ultra highly stable light-emission with almost unchanged fluorescent spectra after annealing at 200 degrees C in air for 10 h. The joint experimental and theoretical study of the main-chain chirality reveals that (1) the chirality of BINOL can be transferred to the polymer backbone, (2) the effective conjugation length is about one BINOL and three fluorenes, (3) the main active chiral block in the copolymers is probably composed by one BINOL with the other two or three fluorenes, and (4) the dihedral angle in the PF-BN copolymers should be larger than 105 degrees. The incorporation of BINOL into the polyfluorene backbone is an effective way to produce highly efficient and stable blue-light-emitting main-chain chiral conjugated polymer with interesting optoelectronic properties. (C) 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 3868-3879, 2010
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