Near-Infrared and White Organic Light Emitting Diodes Based on a Samarium Complex
Photoluminescence (PL) and electroluminescence (EL) properties of a samarium complex Sm(DBM)3 phen (DBM = dibenzoylmethane, phen = 1,10-phenanthroline) were investigated in both visible and near-infrared (NIR) regions. A series of organic light emitting devices based on Sm(DBM)3 phen were fabricated. The device performances were strongly dependent on the hole transportation layer/emitting layer (HTL/EML) interface properties. When using N,N′-diphenyl-N,N-di(m-tolyl)-benzidine (TPD) as HTL, intense NIR EL irradiance could be achieved, accompanied with orange EL emission. When N,N′-di(naphthalen-1-yl)-N,N′-diphenyl-[1,1′-biphenyl]-4,4′-diamine (NPB) was used as HTL, exciplex formed at the HTL/EML interface, and white light emission could be achieved under high operating voltage, due to the integrating of the blue emission from the exciplex and orange emission from Sm3+ ion. Better white organic light emitting diodes (WOLEDs) could be achieved when a ladder HTL 4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP) was introduced into the device, that the device showed bright stable white emission properties under all operating voltages. This work provided a feasible way for the design and fabrication of NIR and WOLEDs with simple device structures.
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Document Type: Research Article
Publication date: November 1, 2013
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