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| Last Update: 01/31/2007 |
Near Infrared Electrophosphorescence from
a Pt-Metalloporphyrin Complex
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Organic light emitting diodes (OLEDs) have been the subject of a significant research effort for the past two decades with a focus on devices that emit almost exclusively in the visible part of the electromagnetic spectrum. Recently, there has been growing interest in OLEDs that emit in the near-infrared (NIR) region (700- 2500nm). Applications for these NIR OLEDs are particularly interesting for night-vision-readable displays and sensors. This we have achieved by utilizing a phosphorescent Pt-tetraphenyltetrabenzoporphyrin (Pt(TPBP)) dopant, with an external quantum efficiency (EQE) greater than 6% at lmax=765nm, which was published in Angew. Chem. Int. Ed..
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Room temperature absorption spectra (black line), and normalized emission spectra
at room temperature (red line), and at 77K (blue line) of Pt(TPBP) in 2-methyl-THF.
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A simple device architecture may be used to achieve an EQE of 6.3% at a low current density, which gradually decreases as the current density is increased. Further, the devices were aged at a high constant current density of 40mA/cm2 corresponding to an initial intensity of 740mW/cm2 and the devices maintain greater than 90% of their initial intensity of 740 mW/cm2 after 1000 hours of operation.
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Additional Information:
Press Release
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