Blue and white organic light-emitting diodes based on 4,4 -bis(2,2 diphenyl vinyl)-1,1 -biphenyl

Blue and white organic light-emitting diodes (OLEDs) based on 4,4′-bis(2,2′ diphenyl vinyl)-1,1′-biphenyl (DPVBi) were reported. Devices with a configuration of indium tin oxide (ITO)/ N , N ′-bis-(1-naphthyl)- N , N ′-diphenyl-1,1′-biphenyl-4,4′-diamine (NPB)/DPVBi/tris-(8-hydroxyquinoline)aluminium (Alq 3 )/LiF/Al have been fabricated. The thickness of the DPVBi used in the OLED has a significant influence on the colour and efficiency. When the thickness of DPVBi is more than 10 nm, the pure blue emission with a peak at 456 nm is observed. And white emission was obtained in the device with a 10 nm DPVBi without doping. The power efficiencies of the blue and white OLEDs are 1.10 and 2.94 lm W −1 , respectively.