Diarylamino-Substituted Stilbene Derivatives for Blue Organic Light-Emitting Diodes

Abstract

A series of bis(diarylamino)stilbene derivatives with various aromatic system were synthesized via the Buchwald-Hartwig cross-coupling reaction. Multilayer devices with the configuration of ITO / NPB (700 angstrom) / ADN: blue dopants 1-5 (300 angstrom: 2 %) / Alq(3) (300 angstrom) / Liq (10 angstrom) / Al were fabricated. Among the molecules, the devices using 4,4'-bis(9,9-diethylfluoren-2-yl-3,5-di-tert-butylphenylamino)stilbene (4) as dopant exhibited blue emission with the luminance of 12590 cd/m(2), the luminous efficiency of 9.10 cd/A at 20 mA/cm(2), the power efficiency of 3.73 lm/W at 20 mA/cm(2), and the CIE coordinates of (0.155, 0.195) at 12.0 V.