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http://dx.doi.org/10.4313/JKEM.2011.24.8.678

Effect of Ph3PO or BCP Between Electron Transport and Emission Layers on the Driving Voltage of Organic Light Emitting Diode  

Ha, Mi-Young (Department of Materials Engineering, Soonchunhyang University)
Moon, Dae-Gyu (Department of Materials Engineering, Soonchunhyang University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.24, no.8, 2011 , pp. 678-681 More about this Journal
Abstract
We have investigated the effect of organic thin film on the driving voltage of OLED (organic light emitting diode) by inserting a 5 nm thick 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) or triphenylphosphineoxide ($Ph_3PO$) between tris-(8-hydroxyquinoline)aluminum ($Alq_3$) electron transport layer and 4,4'-bis(2,2'-diphyenylvinyl)-1,1'-biphenyl (DPVBi) emission layer. The device with 5 nm thick $Ph_3PO$ layer exhibited higher maximum current efficiency and lower driving voltage than the device with BCP layer, resulting from better electron injection from $Alq_3$ to DPVBi in the device with $Ph_3PO$ layer.
Keywords
OLED; Driving voltage; Electron injection; Triphenylphosphine oxide; $Ph_3PO$;
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