Journal Article10.1063/1.1479751
Energy transfer in polymer electrophosphorescent light emitting devices with single and multiple doped luminescent layers
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TL;DR: In this paper, energy transfer in efficient polymer electrophosphorescent organic light emitting diodes (PHOLEDs) using poly(9-vinylcarbazole) (PVK) host doped with one or more phosphorescent cyclometalated Ir(III) complexes was studied.
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Abstract: We study energy transfer in efficient polymer electrophosphorescent organic light emitting diodes (PHOLEDs) using poly(9-vinylcarbazole) (PVK) host doped with one or more phosphorescent cyclometalated Ir(III) complexes. Single dopant double heterostructure PHOLEDs exhibited saturated color luminescence due to emissive triplet metal-to-ligand charge-transfer to ground state transitions of the Ir(III) dopants. Blue PHOLEDs, excited by an endothermic process from the host polymer, exhibited an emission maximum at a wavelength of λmax=474 nm, with an external quantum efficiency of ηext=1.3±0.1% and luminous power efficiency of ηp=0.8±0.1 lm/W. The green PHOLED exhibited ηext=5.1±0.1%, with ηext>2% for both red and yellow emission. Resonant energy transfer between green emitting fac-tris (2-phenylpyridyl)Ir(III) and red emitting bis[2-(2′-benzothienyl)-pyridinato-N,C3′](acetylacetonate)Ir(III) was observed to nearly double the efficiency of red emission when both dopants were simultaneously blended in a PVK ho...
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TL;DR: In this paper, the absorption and emission spectroscopic behavior of cyclometalated fac -tris(2-phenylpyridine) iridium(III) [Ir(ppy) 3 ] is studied at room temperature.
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Phosphorescence from iridium complexes doped into polymer blends
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Dendritic Luminescent Gold(III) Complexes for Highly Efficient Solution-Processable Organic Light-Emitting Devices†
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