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Near-Infrared and White Organic Light Emitting Diodes Based on a Samarium Complex

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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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Keywords: ELECTROLUMINESCENCE; NEAR-INFRARED EMISSION; SAMARIUM COMPLEX; WOLEDS

Document Type: Research Article

Publication date: November 1, 2013

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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