| Abstract: | Five derivatives of 1,4‐bis(2′‐quinolinylethenyl)benzene were prepared through Wittig reaction of a diylide of p‐xylene and two molar equivalents of quinolinyl carbaldehyde. Dyes 1a,b and 2a‐c thus obtained exhibit fluorescence in quantum yields of 0.44–0.78. They are fabricated to light‐emitting diodes in the form of ITO/NPB/CBP/TPBI: dye(5% wt)/Mg: Ag. The devices can be turned on at 6 V, and they displayed blue and green light at intensities up to 5000 cd/m2 at 15 V. The compounds containing methoxy substituents, i.e. 1b and 2b,c , performed more effectively than those without, i.e. 1a and 2a . The former derivatives also showed a red‐shift in their emission spectra with respect to the latter. |
