Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 11, Issue 11, Pages 3285-3293Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200401152
Keywords
cyclic voltammetry; enhanced hole-injection/transport properties; fluorescence; light-emitting materials; oligofluorenes
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A novel series of monodisperse asymmetrically and symmetrically substituted diphenylamino endcapped oligofluorenes. OF(2)-NPhR, R = H or An (An 9-anthryl) and OF(n)-NPh, n = 2-4, has been synthesized by a convergent approach Using palladium-catalyzed Suzuki cross-coupling. End-capping of oligofluorenes with diphenylamino group(s) has been shown to offer advantages in terms of lowering their first ionization potentials, enhancing thermal stability, and inducing good amorphous morphological stability. By tuning the number of diphenylamino end-caps and the chain length, the optimal conjugated length for optical and luminescence properties has been determined. Of all the hitherto reported oligofluorenes capable of serving as non-doped blue emitters, OF(3)-NPh, with an optimal conjugated length, exhibits some of the best hole-transport and blue-emitting properties. A maximum luminance of 7500 cd m(-2) and a luminance efficiency up to 1.8 cd A(-1) have been achieved.
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