A Red Doped OLEDS with a Good Device Performance at High Doping Concentration

Abstract

A new red fluorescent material, (2E,2'E)-3,3'-[4,4''-bis(dimethylamino)-1,1':4', 1''-terphenyl-2',5'-diyl]bis[2-(2-thienyl)acrylonitrile] (ABCV-Th), for organic light emitting diodes (OLEDs) was synthesized and characterized. Photoluminescence spectrum of ABCV-Th in chloroform solution was peaked at 618nm. The red doped OLEDs with the structure of ITO/NPB/MADN: ABCV-Th (x%)/BCP/Alq3/Liq/Al were fabricated to investigate the influence of doping concentration on the device performance. The ABCV-Th doped device with doping concentration of 15% showed the Commission Internationale d'Eclairage (CIExy) coordinate of (0.58, 0.42) at the maximum luminance of 7320cd/m2 and this is comparable to that of the traditional 4-(dicyanomethylene)-2-methyl-6-(julolidin-4-yl-vinyl)-4H-pyran (DCM2) doped OLED (CIExy=0.58, 0.41, 1032cd/m2 at 18V).