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

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/cm2, a power efficiency of 7.35 lm/W at 20 mA/cm2, and CIEx,y coordinates of (x = 0.16, y = 0.26) at 8 V. Also, a deep blue OLED 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 lm/W at 20 mA/cm2, respectively.