Abstract
A series of green dopants based on 2,2-diphenylvinyl end-capped bithiophene and three different arylamine moieties (9-phenylcarbazole, triphenylamine, and N,N’-di-(p-tolyl)benzeneamine) were successfully synthesized by the Suzuki and Wittig coupling reactions. The photophysical properties of these compounds are reported. The strongest PL emitting compound with the 9-phenylcarbazole moiety has been used for fabricating an OLED device with good overall performance.
Highlights
Organic light-emitting diodes (OLEDs) have attracted increasing interest over the last few years because of their potential to achieve low-cost, full-color and flat-panel displays [1]
The designed green dopants 9 based on arylamine 2,3-disubstituted bithiophene derivatives end-capped with the 2,2-diphenylvinyl group were prepared in four steps from the commercially available bithiophene (1, Scheme 1)
The designed green dopants 9 end-capped with the 2,2-diphenylvinyl group were obtained in moderate yields (53%–58%) by the Wittig coupling reactions of compounds 6 and 8 in the present of t-BuOK
Summary
Organic light-emitting diodes (OLEDs) have attracted increasing interest over the last few years because of their potential to achieve low-cost, full-color and flat-panel displays [1]. One of the key developments in OLED display technology can be attributed to the discovery of the guest-host doped emitter system in which a single host material with optimized transport and luminescent properties may be used together with a variety of highly fluorescent guest dopants, leading to its electro-luminescence of desirable hues with very high efficiencies [2]. Oligothiophenes with well-defined structures have been widely exploited in the field-effect transistors and light emitting diodes because they showed high conductivity and unique optical properties which could be finely tuned by their chain length and terminal substituents [5,6,7,8,9]. Other oligothiophene end-capping groups such as diaryboryl, pyridyl, diphenylphosphine, and chargetransfer capable groups have been documented [5,10,11,12,13]
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