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.

Keywords:

• blue OLEDs
• fluorescence
• host
• suzuki cross-coupling reaction
• thiophene group

Acknowledgments

This work was supported by a grant 20110004655 from the Korea Science and Engineering Foundation.