ENHANCED THE PERFORMANCES OF BLUE ORGANIC LIGHT EMITTING DIODE (OLED) BASED ON 4,4’-BIS(2,2’DIPHENYLVINYL)-1,1’-BIPHENYL (DPVBi)

Abstract

Enhanced blue organic light emitting diode (OLED) has been observed from vacuum deposited of 4,4’-bis(2,2’diphenilvinyl)-1,1’-biphenyl (DPVBi) emitting material. The two-layer device structure consists of indium tine oxide (ITO)/PVK/DPVBi/Al has been studied. Here the indium tine oxide (ITO) used as anode, poly-9-vinylcarbozole (PVK) as hole transporting layer, 4,4’-bis(2,2’diphenilvinyl)-1,1’-biphenyl (DPVBi) as the blue emitting layer and Aluminum (Al) as the cathode. Optical properties of DPVBi thin film prepared from thermal evaporation technique were characterized using UV-VIS spectrophotometer. The performances of device were analyzed through current-voltage (IV) curve and the electroluminescent (EL) spectrum.  The two-layer OLED device of ITO/PVK (98 nm)/DPVBi (56 nm)/Al (150nm) shows enhancement of blue light emission and better diodes behavior. The device shows blue emission at peak of 483 nm and the turn-on voltage are at 8.0 V.