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High-efficiency endothermic energy transfer in polymeric light-emitting devices based on cyclometalated Ir complexes
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/content/aip/journal/apl/92/2/10.1063/1.2830618
2008-01-14
2014-10-23

Abstract

We report polymericlight-emitting diodes(PLEDs) made from pinene-substituted iridium(III) phosphorescent dopants: tris(5-(4-difluoro phenyl)-10,10-dimethyl-4-aza-tricycloundeca-2,4,6-triene) iridium (III) and tris(5-(2,4-difluorophenyl)-10,10-dimethyl-4-aza-tricycloundeca-2,4,6-triene) iridium (III) . The pinene substitution introduces steric hindrance to molecular structure of the dopant that reduces triplet-triplet annihilation between dopants and consequently enhances device performance. Via endothermic energy transfer from poly(vinylcarbazole) to and , a peak electroluminescent efficiency of or at or doped and solution-processed PLEDs have been obtained. These values represent significant improvement in performance over previously reported endothermic energy-transfer based electrophosphorescent devices.

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Scitation: High-efficiency endothermic energy transfer in polymeric light-emitting devices based on cyclometalated Ir complexes
http://aip.metastore.ingenta.com/content/aip/journal/apl/92/2/10.1063/1.2830618
10.1063/1.2830618
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