Blue organic light-emitting materials based on diphenylaminofluorene and N-phenylcarbazole derivatives

Abstract

A series of diphenylaminofluorene- and phenylcarbazole-derived, blue fluorescent molecules have been synthesized via the Hornor-Wadsworth-Emmons and Suzuki-cross coupling reactions. To explore the electroluminescent properties of these molecules, multilayer devices were fabricated with a structure of ITO/NPB(1-6) doped in MADN/Bphen/Liq/Al, yielding a device that exhibited highly efficient sky-blue emissions with the luminous efficiency of 11.2 cd/A at 20 mA/cm(2), a power efficiency of 7.35 Im/W at 20 mA/cm(2), and CIEx,y coordinates of (x=0.16, y=0.26) at 8 V. Also, a deep blue CLED with CIEx,y coordinates of (x=0.16, y=0.13) at 8 V showed a luminous efficiency of 2.13 cd/A and power efficiency of 1.20 Im/W at 20 mA/cm(2), respectively. (C) 2009 Elsevier B.V. All rights reserved.