Reduced Efficiency Roll-Off in White Phosphorescent Organic Light-Emitting Diodes Based on Double Emission Layers

We demonstrate high-efficiency white phosphorescent organic light-emitting diodes with low efficiency roll-off. The feature of the device concept is employing two phosphorescent emission layers (EMLs) separated by a mixed interlayer. Both the EMLs are doped by two phosphorescent dyes. The resulting...

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Detalles Bibliográficos
Autores principales: Sheng, Ren, Gao, Ying, Li, Asu, Duan, Yu, Zhao, Yi, Zheng, Jie, Chen, Ping
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6337355/
https://www.ncbi.nlm.nih.gov/pubmed/30626114
http://dx.doi.org/10.3390/molecules24010211
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author Sheng, Ren
Gao, Ying
Li, Asu
Duan, Yu
Zhao, Yi
Zheng, Jie
Chen, Ping
author_facet Sheng, Ren
Gao, Ying
Li, Asu
Duan, Yu
Zhao, Yi
Zheng, Jie
Chen, Ping
author_sort Sheng, Ren
collection PubMed
description We demonstrate high-efficiency white phosphorescent organic light-emitting diodes with low efficiency roll-off. The feature of the device concept is employing two phosphorescent emission layers (EMLs) separated by a mixed interlayer. Both the EMLs are doped by two phosphorescent dyes. The resulting white device with the optimized doping concentration shows a maximum efficiency of 31.0 cd/A with extremely low efficiency roll-off of 30.7 cd/A at 1000 cd/m(2), 27.2 cd/A at 5000 cd/m(2), and 25.5 cd/A at 10,000 cd/m(2), respectively, without any outcoupling structures. This is enabled by the balanced charge carrier transport in EMLs, leading to broader exciton recombination zone.
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spelling pubmed-63373552019-01-25 Reduced Efficiency Roll-Off in White Phosphorescent Organic Light-Emitting Diodes Based on Double Emission Layers Sheng, Ren Gao, Ying Li, Asu Duan, Yu Zhao, Yi Zheng, Jie Chen, Ping Molecules Article We demonstrate high-efficiency white phosphorescent organic light-emitting diodes with low efficiency roll-off. The feature of the device concept is employing two phosphorescent emission layers (EMLs) separated by a mixed interlayer. Both the EMLs are doped by two phosphorescent dyes. The resulting white device with the optimized doping concentration shows a maximum efficiency of 31.0 cd/A with extremely low efficiency roll-off of 30.7 cd/A at 1000 cd/m(2), 27.2 cd/A at 5000 cd/m(2), and 25.5 cd/A at 10,000 cd/m(2), respectively, without any outcoupling structures. This is enabled by the balanced charge carrier transport in EMLs, leading to broader exciton recombination zone. MDPI 2019-01-08 /pmc/articles/PMC6337355/ /pubmed/30626114 http://dx.doi.org/10.3390/molecules24010211 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Sheng, Ren
Gao, Ying
Li, Asu
Duan, Yu
Zhao, Yi
Zheng, Jie
Chen, Ping
Reduced Efficiency Roll-Off in White Phosphorescent Organic Light-Emitting Diodes Based on Double Emission Layers
title Reduced Efficiency Roll-Off in White Phosphorescent Organic Light-Emitting Diodes Based on Double Emission Layers
title_full Reduced Efficiency Roll-Off in White Phosphorescent Organic Light-Emitting Diodes Based on Double Emission Layers
title_fullStr Reduced Efficiency Roll-Off in White Phosphorescent Organic Light-Emitting Diodes Based on Double Emission Layers
title_full_unstemmed Reduced Efficiency Roll-Off in White Phosphorescent Organic Light-Emitting Diodes Based on Double Emission Layers
title_short Reduced Efficiency Roll-Off in White Phosphorescent Organic Light-Emitting Diodes Based on Double Emission Layers
title_sort reduced efficiency roll-off in white phosphorescent organic light-emitting diodes based on double emission layers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6337355/
https://www.ncbi.nlm.nih.gov/pubmed/30626114
http://dx.doi.org/10.3390/molecules24010211
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