Near-infrared phosphorescent OLEDs exhibiting over 10% external quantum efficiency and extremely long lifetime using resonant energy transfer with a phosphorescent assist dopant
{"title":"Near-infrared phosphorescent OLEDs exhibiting over 10% external quantum efficiency and extremely long lifetime using resonant energy transfer with a phosphorescent assist dopant","authors":"T. Hanayama, Takeshi Sano, Yumiko Saito, Takeru Nakamura, Yutaka Okuyama, Hisahiro Sasabe, Junji Kido","doi":"10.35848/1882-0786/ad3725","DOIUrl":null,"url":null,"abstract":"\n We have introduced a three-component light-emitting layer consisting of a host, a phosphorescent assist dopant, and a phosphorescent emitter to simultaneously realize high efficiency and long lifetime in near-infrared organic light-emitting diodes. An efficient energy transfer between the two phosphorescent materials was observed with 1 wt% doping ratio of the near-infrared emitter, significantly enhancing the external quantum efficiency reaching 10.5% with an emission peak at 769 nm. The device showed a low drive voltage and a long operational lifetime, with a luminance decay of less than 11% from the initial value after 4800 hours under accelerated conditions of 100 mA/cm2.","PeriodicalId":503885,"journal":{"name":"Applied Physics Express","volume":" 33","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Physics Express","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.35848/1882-0786/ad3725","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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Abstract
We have introduced a three-component light-emitting layer consisting of a host, a phosphorescent assist dopant, and a phosphorescent emitter to simultaneously realize high efficiency and long lifetime in near-infrared organic light-emitting diodes. An efficient energy transfer between the two phosphorescent materials was observed with 1 wt% doping ratio of the near-infrared emitter, significantly enhancing the external quantum efficiency reaching 10.5% with an emission peak at 769 nm. The device showed a low drive voltage and a long operational lifetime, with a luminance decay of less than 11% from the initial value after 4800 hours under accelerated conditions of 100 mA/cm2.
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