Blue-Light-Emitting Bis(diarylamino)stilbene Derivatives: Synthesis, Photophysical Properties, and Highly Efficient OLEDs

摘要

New electroluminescent materials, 4,4'-bis(2-naphthyl-4-tert-butylphenylamino)-stilbene (1), 4,4'-bis(4-tert-butylphenyl-3,5-di-tert-butylphenylamino)stilbene (2), and 4,4'-bis(di-4-tert-butylphenylamino)stilbene (3) were synthesized and charac terized. To evaluate the electroluminescent properties of these compounds, multi-layered OLED devices 1-3 were designed. By employing blue dopant 1 into a multilayer device, it was possible to achieve a maximum luminance of 8861 cd m~(-2) at 12.0 V, a luminous efficiency of 6.82 cdA~(-1) at 20mA cm~(-2), a power efficiency of 2.72 lm W~(-1) at 20mA cm~(-2), and CIE_(x,y) coordinates of (x = 0.158,y = 0.187) at 10.0 V. These results demonstrated the superiority of these bis (diarylamino)-stilbene derivatives in organic light-emitting devices.