Abstract
Absorption and emission spectral characteristics of a bis(hydroxyphenylquinoxaline) Q, and two aromatic polyethers containing phenylquinoxaline rings, Q-DBF and Ox-Q, were studied in various solvents. Q, Q-DBF and Ox-Q display two absorption bands, while a poly(1,3,4-oxadiazole-ether) Ox-BisA, exhibits a single absorption band. Their fluorescence spectra (2.5×10−6molL−1) were characterized by an emission band between 380 and 520nm. At slightly lower concentrations (6.4×10−7molL−1) and under excitation with light corresponding to the highest energy absorption band, Q-DBF and Ox-Q in ethyl acetate and cyclohexane solutions exhibited simultaneously dual emission bands in the near-UV (≈355nm) and blue region (≈432nm). The emission characteristics were quantified by CIE indices (in x, y color coordinates) for the investigated systems. Values of fluorescence quantum yields ranging from 15.93 to 49.83% in chloroform media were obtained.
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