Synthesis and Electroluminescent Properties of Blue-Light-Emitting Arylene Derivatives End-Capped with Thiophene Groups

Abstract

In this study, four blue fluorescent arylenes end-capped with thiophene derivatives have been synthesized. To explore electroluminescent properties of these molecules, multilayer OLEDs device structure of ITO/NPB/EML/BPhen/Al were fabricated. Two multilayer devices, using 3–4, showed the efficient deep blue emissions with CIE x,y of (0.159, 0.092) and (0.151,0.082) at 9.0 V, and the external quantum efficiencies of 1.60 and 0.80%, respectively. A PFVtPh doped-device exhibited the highly efficient blue emission with a maximum luminance of 3480 cd m−2 at 9.0 V, the external quantum efficiency of 5.23%, and CIE x,y of (0.151, 0.185) at 9.0 V.