Highly Efficient Blue Light-Emitting Materials Based on Arylamine Substituted DPVBi Derivatives

Abstract

A series of arylamine substituted DPVBi derivatives (1-4) were synthesized via the Horner-Wadsworth-Emmons reaction. Their electroluminescent properties were examined by fabricating a multilayer OLED device with the following structure: ITO/DNTPD (40 nm)/NPB (20 nm)/2% DPVBi derivatives (1-4) doped in MADN (20 nm)/Alq(3) (40 nm)/Liq (1.0 nm)/Al. All devices showed efficient blue emission. In particular, a high efficiency blue OLED was fabricated using compound 1 as a dopant in the emitting layer. The maximum luminance, luminous efficiency, power efficiency and CIE coordinates of the blue OLED using compound 1 as a dopant were 16110 cd/m(2) at 10 V, 10.1 cd/A at 20 mA/cm(2), 4.37 Im/W at 20 mA/cm(2), and (x = 0.197, y = 0.358) at 8 V, respectively. Moreover, a device using compound 4 as the dopant exhibited efficient deep blue emission with a luminance, luminous efficiency, power efficiency and CIE coordinates of 7005 cd/m(2) at 10 V, 6.25 cd/A at 20 mA/cm(2), 2.50 Im/W at 20 mA/cm(2) and (x = 0.151, y = 0.143) at 8 V, respectively.