Carbazole-containing polyphenylquinolines as a basis for optoelectronic materials with white luminescence

Abstract

The photophysical properties of poly 2,2' (1 dodecyl carbazole 4,7 yl) 6,6' (oxy) bis (4 phe nylquinoline) in a solution, as a film, and in a poly(methyl methacrylate) or poly N vinylcarbazole host matrix have been studied. Considerable positive solvatochromism in the photoluminescence spectra, com pared with solvatochromism in the absorption spectra, indicates that the dipole moment of the donor-accep tor complex increases in the excited state. Calculations show that the dipole moments of the complex in the ground and excited states differ by more than an order of magnitude. Upon transition to films, photolumi nescence is observed in the entire visible spectral range (white luminescence). The intensity of the white lumi nescence grows by an order of magnitude when the polymer is dispersed in a poly(methyl methacrylate) matrix. The integrated photosensitivity and parameters of the photogeneration process (quantum yield of carrier photogeneration, quantum yield of free carrier formation, and thermalization radii) have been determined.

Luminescence-kinetic spectroscopy of compound complexes of polyphenylquinolines

“…3) measured for the PPQs under study at a wavelength of λ = 395 nm, which was used in the present study and corresponds to the absorption and luminescence excitation edges ( Figs. 1 and 2), are also in good agreement with the results previously obtained at λ = 425 nm [1,2].…”

“…1 and 2, respectively. The results for all the PPQs under study are correlated with those obtained previously [1][2][3]. The luminescence spectra (Fig.…”

“…It is known [1,2] that the monomer unit of 2,6 poly phenylquinolines (PPQs) of general formula , (1) where X is the bridge group and Ar is the arylene moi ety, is a compound intramolecular charge transfer complex (ICTC) or a donor-acceptor (D-A) com plex between the donor (D) arylene Ar moiety and the acceptor (A) phenilquinoline (PhQ) ring, which is, in turn, a D-A complex between the bridge group X and quinoline ring, i.e., an ICTC in which the arylene moiety and the bridge group between the acceptor quinoline rings are donors.…”

“…Polymers with these bridge groups have been syn thesized previously and exhibited rather high photo sensitivity characteristics [2,3]. The PPQs under study (PPQ 1-PPQ 4) were synthesized as was per formed in [4] by the Friedläender reaction [5].…”

Achievements in polycondensation and condensation polymers

“…In addition to the mentioned traditional condensa tion polymers, there is scarce information about the synthesis and properties of other types of polymers that have rapidly developed in recent years [301][302][303][304][305][306][307][308][309][310][311][312][313][314]: poly(arylene ether sulfide sulfones), polyphenylquin olines, polyphenylquinones, polybenzotriazoleim ides, polyamidines, poly[bis(itaconimides)], and poly(arylene)thiophenones. …”