Journal
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
Volume 52, Issue 4, Pages 811-818Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jccs.200500114
Keywords
electroluminescence; quinoline; OLED; PPV
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Five derivatives of 1,4-bis(2'-quinolinylethenyl)benzene were prepared through Wittig reaction of a di-ylide 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/m(2) 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.
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