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Molecules 2019, 24(1), 211; https://doi.org/10.3390/molecules24010211

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

1
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
2
Institute of Science and Technology for Opto-Electronic Information, Yantai University, Yantai 264005, China
*
Author to whom correspondence should be addressed.
Received: 12 December 2018 / Revised: 2 January 2019 / Accepted: 5 January 2019 / Published: 8 January 2019
(This article belongs to the Special Issue Organic Light Emitting Diodes II)
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Abstract

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/m2, 27.2 cd/A at 5000 cd/m2, and 25.5 cd/A at 10,000 cd/m2, respectively, without any outcoupling structures. This is enabled by the balanced charge carrier transport in EMLs, leading to broader exciton recombination zone. View Full-Text
Keywords: organic light-emitting diodes; double emission layers structure; high efficiency; low efficiency roll-off organic light-emitting diodes; double emission layers structure; high efficiency; low efficiency roll-off
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Sheng, R.; Gao, Y.; Li, A.; Duan, Y.; Zhao, Y.; Zheng, J.; Chen, P. Reduced Efficiency Roll-Off in White Phosphorescent Organic Light-Emitting Diodes Based on Double Emission Layers. Molecules 2019, 24, 211.

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