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http://dx.doi.org/10.5012/bkcs.2008.29.1.139

Poly(p-phenylenevinylene)s Derivatives Containing a New Electron-Withdrawing CF3F4Phenyl Group for LEDs  

Jin, Young-Eup (Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University)
Kang, Jeung-Hee (Samsung Electronics Co)
Song, Su-Hee (Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University)
Park, Sung-Heum (Department of Materials Science and Engineering, Gwangju Institute of Science and Technology)
Moon, Ji-Hyun (Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University)
Woo, Han-Young (Department of Nanomaterials Engineering, Pusan National University)
Lee, Kwang-Hee (Department of Materials Science and Engineering, Gwangju Institute of Science and Technology)
Suh, Hong-Suk (Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University)
Publication Information
Bulletin of the Korean Chemical Society / v.29, no.1, 2008 , pp. 139-147 More about this Journal
Abstract
New PPV derivatives which contain electron-withdrawing CF3F4phenyl group, poly[2-(2-ethylhexyloxy)-5-(2,3,5,6-tetrafluoro-4-trifluoromethylphenyl)-1,4-phenylenevinylene] (CF3F4P-PPV), and poly[2-(4-(2-etylhexyloxy)-phenyl)-5-(2,3,5,6-tetrafluoro-4-trifluoromethylphenyl)-1,4-phenylenevinylene] (P-CF3F4P-PPV), have been synthesized by GILCH polymerization. As the result of the introduction of the electron-withdrawing CF3F4phenyl group to the phenyl backbone, the LUMO and HOMO energy levels of CF3F4P-PPV (3.14, 5.50 eV) and P-CF3F4P-PPV (3.07, 5.60 eV) were reduced. The PL emission spectra in solid thin film are more red-shifted over 50 nm and increased fwhm (full width at half maximum) than solution conditions by raising aggregation among polymer backbone due to electron withdrawing effect of 2,3,5,6-tetrafluoro-4-trifluoromethylphenyl group. The EL emission maxima of CF3F4P-PPV and P-CF3F4P-PPV appear at around 530-543 nm. The current density-voltage-luminescence (J-V-L) characteristics of ITO/PEDOT/polymer/Al devices of CF3F4P-PPV and P-CF3F4P-PPV show that turn-on voltages are around 12.5 and 7.0 V, and the maximum brightness are about 82 and 598 cd/m2, respectively. The maximum EL efficiency of P-CF3F4P-PPV (0.51 cd/A) was higher than that of CF3F4P-PPV (0.025 cd/A).
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