Dual efficiency enhancement by delayed fluorescence and dipole orientation in high-efficiency fluorescent organic light-emitting diodes

Daisuke Yokoyama; Youngil Park; Beomjin Kim; Sookang Kim; Yong-Jin Pu; Junji Kido; Jongwook Park

doi:10.1063/1.3637608

journal article Sep 19, 2011

Dual efficiency enhancement by delayed fluorescence and dipole orientation in high-efficiency fluorescent organic light-emitting diodes

Daisuke Yokoyama Youngil Park Beomjin Kim Sookang Kim Yong-Jin Pu

Junji Kido Jongwook Park

Applied Physics Letters Vol. 99 No. 12 · AIP Publishing

View at Publisher Save 10.1063/1.3637608

Abstract

To explain the origin of extremely high efficiencies of deep-blue fluorescent organic light-emitting diodes (OLEDs) with anisotropic-shaped anthracene derivatives, the enhancements of singlet-exciton generation efficiency and outcoupling efficiency were investigated by transient electroluminescence measurement and variable angle spectroscopic ellipsometry, respectively. Both the delayed fluorescence from singlet excitons generated via triplet-triplet annihilation and the outcoupling enhancement by dipole orientation of emitters were found to contribute to the high external quantum efficiencies of the devices. This dual efficiency enhancement is important for understanding and further improving high-performance fluorescent OLEDs.

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Details

Published: Sep 19, 2011
Vol/Issue: 99(12)

Authors

D

Daisuke Yokoyama

Yamagata University 1 Department of Organic Device Engineering, Graduate School of Science and Engineering and Research Center for Organic Electronics (ROEL), , 4-3-16 Johnan, Yonezawa, Yamagata 992-8510, Japan

Y

Youngil Park

The Catholic University of Korea 2 Department of Chemistry/Display Research Center, , Bucheon 420-743, South Korea

B

Beomjin Kim

The Catholic University of Korea 2 Department of Chemistry/Display Research Center, , Bucheon 420-743, South Korea

S

Sookang Kim

The Catholic University of Korea 2 Department of Chemistry/Display Research Center, , Bucheon 420-743, South Korea

Y

Yong-Jin Pu

Yamagata University 1 Department of Organic Device Engineering, Graduate School of Science and Engineering and Research Center for Organic Electronics (ROEL), , 4-3-16 Johnan, Yonezawa, Yamagata 992-8510, Japan

J

Junji Kido

Yamagata University 1 Department of Organic Device Engineering, Graduate School of Science and Engineering and Research Center for Organic Electronics (ROEL), , 4-3-16 Johnan, Yonezawa, Yamagata 992-8510, Japan

J

Jongwook Park

The Catholic University of Korea 2 Department of Chemistry/Display Research Center, , Bucheon 420-743, South Korea

Cite This Article

Daisuke Yokoyama, Youngil Park, Beomjin Kim, et al. (2011). Dual efficiency enhancement by delayed fluorescence and dipole orientation in high-efficiency fluorescent organic light-emitting diodes. Applied Physics Letters, 99(12). https://doi.org/10.1063/1.3637608

Dual efficiency enhancement by delayed fluorescence and dipole orientation in high-efficiency fluorescent organic light-emitting diodes

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