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Reduced efficiency roll-off in high-efficiency hybrid white organic light-emitting diodes
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/content/aip/journal/apl/92/5/10.1063/1.2836772
2008-02-08
2015-01-31

Abstract

White organic light emitting diodes harvesting triplet excitons from the fluorescent blue emitter -di-1-naphthalenyl--diphenyl-[-quaterphenyl]--diamine (4P-NPD) are presented. Direct doping of the phosphorescent orange iridium(III)bis(2-methyldibenzo-quinoxaline)(acetylacetonate) into 4P-NPD results in a strongly reduced efficiency roll-off as compared to separate emission layers, and yields total external power efficiency (24.1% quantum efficiency) at a luminance of [CIE 1931 chromaticity coordinates (0.49,0.41)], measured in an integrating sphere. Introduction of an exciton balancing interlayer improves the chromaticity (0.43,0.43) toward the CIE illuminant A warm white point and keeps a high efficiency of , 20.3%.

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Scitation: Reduced efficiency roll-off in high-efficiency hybrid white organic light-emitting diodes
http://aip.metastore.ingenta.com/content/aip/journal/apl/92/5/10.1063/1.2836772
10.1063/1.2836772
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