Excitonic Creation of Highly Luminescent Defects In Situ in Working Organic Light-Emitting Diodes

Yong Biao Zhao; Grayson L. Ingram; Xi Wen Gong; Xi Yan Li; Li Na Quan; Pei Cheng Li; Jia Qi Xie; Edward H. Sargent; Zheng Hong Lu

doi:10.1002/adom.201700856

Excitonic Creation of Highly Luminescent Defects In Situ in Working Organic Light-Emitting Diodes

Yong Biao Zhao, Grayson L. Ingram, Xi Wen Gong, Xi Yan Li, Li Na Quan, Pei Cheng Li, Jia Qi Xie, Edward H. Sargent^*, Zheng Hong Lu

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

Excitons play the central role in organic optoelectronic devices. Efficient exciton-to-photon and photon-to-electron conversion promote quantum yield in optoelectronic devices such as organic light-emitting diodes and organic solar cells. Exciton-related reaction products and defects in working devices have previously been viewed as fatal to stability. Here, the utilization of these excitonic reactions to create luminescent defects with extremely high (6.7%) external quantum efficiency in an operating device containing 1,1-bis((di-4-tolylamino)phenyl) cyclohexane (TAPC) is reported. Transient photoluminescence reveals a long delayed fluorescence lifetime (2.7 µs) from these emissive defects, indicating that they exhibit thermally activated delayed fluorescence. It is shown that the functional group of tri-p-tolylamine (TPTA) follows similar processes as TAPC, suggesting that the chemical nature of the observed luminescent defects is directly related to TPTA.

Original language	English (US)
Article number	1700856
Journal	Advanced Optical Materials
Volume	6
Issue number	2
DOIs	https://doi.org/10.1002/adom.201700856
State	Published - Jan 18 2018

Keywords

degradation
excitons
luminescent defects
organic light-emitting diodes
thermally activated delayed fluorescence

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics

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10.1002/adom.201700856

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title = "Excitonic Creation of Highly Luminescent Defects In Situ in Working Organic Light-Emitting Diodes",

abstract = "Excitons play the central role in organic optoelectronic devices. Efficient exciton-to-photon and photon-to-electron conversion promote quantum yield in optoelectronic devices such as organic light-emitting diodes and organic solar cells. Exciton-related reaction products and defects in working devices have previously been viewed as fatal to stability. Here, the utilization of these excitonic reactions to create luminescent defects with extremely high (6.7%) external quantum efficiency in an operating device containing 1,1-bis((di-4-tolylamino)phenyl) cyclohexane (TAPC) is reported. Transient photoluminescence reveals a long delayed fluorescence lifetime (2.7 µs) from these emissive defects, indicating that they exhibit thermally activated delayed fluorescence. It is shown that the functional group of tri-p-tolylamine (TPTA) follows similar processes as TAPC, suggesting that the chemical nature of the observed luminescent defects is directly related to TPTA.",

keywords = "degradation, excitons, luminescent defects, organic light-emitting diodes, thermally activated delayed fluorescence",

author = "Zhao, {Yong Biao} and Ingram, {Grayson L.} and Gong, {Xi Wen} and Li, {Xi Yan} and Quan, {Li Na} and Li, {Pei Cheng} and Xie, {Jia Qi} and Sargent, {Edward H.} and Lu, {Zheng Hong}",

note = "Funding Information: This work was funded by the Natural Sciences and Engineering Research Council of Canada, the National Natural Science Foundation of China (Grant No. U1402273), and the Connaught Global Challenge Fund of the University of Toronto. The research infrastructure funding was provided by the Canada Foundation for Innovation and the Ontario Research Fund – Research Infrastructure. Publisher Copyright: {\textcopyright} 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

year = "2018",

month = jan,

day = "18",

doi = "10.1002/adom.201700856",

language = "English (US)",

volume = "6",

journal = "Advanced Optical Materials",

issn = "2195-1071",

publisher = "John Wiley and Sons Inc.",

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T1 - Excitonic Creation of Highly Luminescent Defects In Situ in Working Organic Light-Emitting Diodes

AU - Zhao, Yong Biao

AU - Ingram, Grayson L.

AU - Gong, Xi Wen

AU - Li, Xi Yan

AU - Quan, Li Na

AU - Li, Pei Cheng

AU - Xie, Jia Qi

AU - Sargent, Edward H.

AU - Lu, Zheng Hong

N1 - Funding Information: This work was funded by the Natural Sciences and Engineering Research Council of Canada, the National Natural Science Foundation of China (Grant No. U1402273), and the Connaught Global Challenge Fund of the University of Toronto. The research infrastructure funding was provided by the Canada Foundation for Innovation and the Ontario Research Fund – Research Infrastructure. Publisher Copyright: © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

PY - 2018/1/18

Y1 - 2018/1/18

N2 - Excitons play the central role in organic optoelectronic devices. Efficient exciton-to-photon and photon-to-electron conversion promote quantum yield in optoelectronic devices such as organic light-emitting diodes and organic solar cells. Exciton-related reaction products and defects in working devices have previously been viewed as fatal to stability. Here, the utilization of these excitonic reactions to create luminescent defects with extremely high (6.7%) external quantum efficiency in an operating device containing 1,1-bis((di-4-tolylamino)phenyl) cyclohexane (TAPC) is reported. Transient photoluminescence reveals a long delayed fluorescence lifetime (2.7 µs) from these emissive defects, indicating that they exhibit thermally activated delayed fluorescence. It is shown that the functional group of tri-p-tolylamine (TPTA) follows similar processes as TAPC, suggesting that the chemical nature of the observed luminescent defects is directly related to TPTA.

AB - Excitons play the central role in organic optoelectronic devices. Efficient exciton-to-photon and photon-to-electron conversion promote quantum yield in optoelectronic devices such as organic light-emitting diodes and organic solar cells. Exciton-related reaction products and defects in working devices have previously been viewed as fatal to stability. Here, the utilization of these excitonic reactions to create luminescent defects with extremely high (6.7%) external quantum efficiency in an operating device containing 1,1-bis((di-4-tolylamino)phenyl) cyclohexane (TAPC) is reported. Transient photoluminescence reveals a long delayed fluorescence lifetime (2.7 µs) from these emissive defects, indicating that they exhibit thermally activated delayed fluorescence. It is shown that the functional group of tri-p-tolylamine (TPTA) follows similar processes as TAPC, suggesting that the chemical nature of the observed luminescent defects is directly related to TPTA.

KW - degradation

KW - excitons

KW - luminescent defects

KW - organic light-emitting diodes

KW - thermally activated delayed fluorescence

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Excitonic Creation of Highly Luminescent Defects In Situ in Working Organic Light-Emitting Diodes

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