New electroluminescent copolymers with fluoro groups in vinylene unit, poly(9,9-di-hexylfluorene-2,
7-vinylene-co-pphenylenedifluorovinylene)
(PFVPDFV), have been synthesized by the GILCH polymerization. The fluoro groups were
introduced on vinylene units to increase the electron affinities of the copolymers. The PFVPDFVs exhibit absorption
spectra with maximum peaks at 371 ~ 413 nm. In the PL spectra of PFVPDFVs, as the PDFV content increases up to
50% in the copolymer system, fwhm was decreased by 4 - 38 nm as compared to PFV. The HOMO energy levels of the
copolymers were about 5.25 - 5.50 eV, and the LUMO energy levels were about 2.67-2.97 eV. The polymer LEDs
(ITO/PEDOT/polymer/Al) of PFVPDFVs showed emission with maximum peaks at around 472 - 538 nm. By adjusting
the feed ratios of PDFV in the copolymers, it was possible to tune the emission colors from greenish yellow to orange
depending on the obtained CIE coordinates. The luminescence efficiencies of the copolymers at room temperature are
about 0.1-1.47 cd/A. The introduction of up to 50 % of PDFV in PFVPDFVS can enhance the device performance to
result in high current density, brightness and efficiency due to the increased electron injection ability caused by the
presence of fluoro groups in the vinylene units.
New fluorin-containing electroluminescent polymers in vinylene units, poly(2-dimethyldodecylsilyl-p-phenylenedifluorovinylene)
(DMDS-PPDFV), have been synthesized by GILCH polymerization. This polymer has been used
as the electroluminescent layers in light-emitting diodes (LEDs) (ITO/PEDOT/polymer/Al). DMDS-PPDFV shows
PL around λmax = 455 nm (exciting wavelength, 365 nm) and green EL around λmax =489nm. Attachment of two the
fluoro groups were introduced to poly(2-dimethydodecylsilyl-1,4-phenylenevinylene) (DMDS-PPV) to give DMDSPPDFV
in an attempt to increase the electron affinity of the parent polymer.
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