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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 26, Number 5
BKCSDE 26(5)
May 20, 2005 

Novel Poly(p-phenylenevinylene)s Derivatives with CF3-Phenyl Substituent for Light-Emitting Diodes
Youngeup Jin, Jinwoo Kim, Sung Heum Park, Kwanghee Lee, Hongsuk Suh*
Electroluminescence, PPV, Polymer, PLED, Light-emitting diodes (LEDs)
New PPV derivatives which contain electron-withdrawing trifluoromethyl (CF3) group, poly[2-(2-ethylhexyloxy)- 5-(4-trifluoro methylphenyl)-1,4-phenylenevinylene] (EHCF3P-PPV), and poly[2-(2-ethylhexyloxy)-5- (3,5-bis(trifluoromethyl)-phenyl)-1,4-phenylenevinylene] (EHBCF3P-PPV), have been synthesized by GILCH polymerization. As the result of the introduction of the electron-withdrawing CF3 group to the phenyl substituent, the LUMO and HOMO energy levels of EHCF3P-PPV (2.8, 5.1 eV) and EHBCF3P-PPV (3.0, 5.3 eV) were lower than those of known poly[2-(2-ethylhexyloxy)-5-phenyl-1,4-phenylenevinylene] (EHP-PPV) (2.6, 4.9 eV). These polymers have been used as the electroluminescent (EL) layers in double layer lightemitting diodes (LEDs) (ITO/PEDOT/polymer/Al). EHCF3P-PPV, and EHBCF3P-PPV show maximum photoluminescence (PL) peaks at λmax = 550, 539 nm, and maximum EL peak at λmax = 545, 540 nm, respectively. The current-voltage-luminance (I-V-L) characteristics of the polymers show that turn-on voltages of EHCF3P-PPV and EHBCF3P-PPV are around 4.0 and 3.5 V, respectively.
795 - 801
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