1. Visible to near-infrared organic light-emitting diodes using phosphorescent materials by solution process
- Author
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Kajii, Hirotake, Kimpara, Kunitoshi, and Ohmori, Yutaka
- Subjects
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LIGHT emitting diodes , *INFRARED radiation , *PHOSPHORESCENCE , *SOLUTION (Chemistry) , *DYES & dyeing , *IRIDIUM , *PORPHYRINS , *CARBAZOLE - Abstract
Abstract: The characteristics of visible to near-infrared OLEDs with co-doping three phosphorescent dyes, iridium (III) bis(2-(4,6-difluorephenyl)pyridinato-N,C2′) (FIrpic), tris(1-phenylisoquinoline)iridium(III) (Ir(piq)3), Pt-tetraphenyltetrabenzoporphyrin (Pt(tpbp)) in poly(N-vinylcarbazole) host as blue, red and near-infrared emitters are investigated. Visible to near-infrared OLEDs covering the wavelength range from 450 to 850 nm were achieved. The device with 11.7 wt.% FIrpic, 0.3 wt.% Ir(piq)3 and 0.1 wt.% Pt(tpbp) showed white light emission of CIE (0.34, 0.39). The co-doping results in efficient cascade energy transfer from host through Ir complexes. For 0.1 wt.% Pt(tpbp), the optimal device exhibited the maximum output power of 3 mW/cm2, maximum luminance of 2900 cd/m2 and the maximum efficiency of 7 cd/A. [Copyright &y& Elsevier]
- Published
- 2009
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