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Saturated Red Light‐Emitting Copolymers of Poly(aryleneethynylene)s with Narrow‐Band‐Gap (NBG) Units: Synthesis and Luminescent Properties
Author(s) -
Shi Chenjun,
Wu Yun,
Zeng Wenjin,
Xie Yuqing,
Yang Kaixia,
Cao Yong
Publication year - 2005
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200500041
Subject(s) - comonomer , copolymer , electroluminescence , luminescence , materials science , polymer , polymer chemistry , coupling reaction , fluorescence , light emitting diode , photochemistry , catalysis , band gap , molar ratio , chemistry , nanotechnology , organic chemistry , optoelectronics , composite material , optics , physics , layer (electronics)
Summary: A series of novel poly(fluoreneethynylene) (PFE) copolymers containing a molar ratio less than or equal to 50% of narrow‐band‐gap (NBG) comonomers, 4,7‐dithienyl‐2,1,3‐benzothiadiazole (DBT), and 2,1,3‐benzothiadiazole (BT), is prepared by the Pd‐Cu‐catalyzed coupling reaction. The copolymers are soluble in common organic solvents. All the polymers are fluorescent in solution and in solid state. Chemical and photophysical properties of these copolymers were thoroughly studied. Devices based on the copolymers emit saturated red light, and the emission slightly red‐shifted gradually with increasing NBG comonomer content. The maximal external quantum efficiency of the polymer light‐emitting diodes (PLED) reaches 0.41% with the emission maximum at 638 nm.Synthesis of PFE by Pd‐Cu‐catalyzed coupling reaction.