High-Efficiency Near-Infrared OLED Enabled by Exciplex-Forming Hosts and a New Organic Fluorescent Emitter

Yi Yun Chen; Yu Cheng Kung; Miaosheng Wang; Yuan Chih Lo; Yao Te Chia; Chun Kai Wang; Deng Gao Chen; Ju Ting Cheng; Pi Tai Chou; Chichi Wu; Elise Y. Li; Bin Hu; Wen Yi Hung; Ken Tsung Wong

doi:10.1002/adom.202303131

High-Efficiency Near-Infrared OLED Enabled by Exciplex-Forming Hosts and a New Organic Fluorescent Emitter

Yi Yun Chen, Yu Cheng Kung, Miaosheng Wang, Yuan Chih Lo, Yao Te Chia, Chun Kai Wang, Deng Gao Chen, Ju Ting Cheng, Pi Tai Chou^*, Chichi Wu, Elise Y. Li, Bin Hu^*, Wen Yi Hung^*, Ken Tsung Wong^*

^*Corresponding author for this work

Department of Chemistry

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

1 Citation (Scopus)

Abstract

Two blends comprising new dicyanopyrazine-based acceptors (m-CN and p-CN) and a carbazole-based donor CPTBF are explored for exciplex formation. The CPTBF:m-CN and CPTBF:p-CN blends show the signature red-shifted emission together with the delayed fluorescence observed in time-resolved measurement, manifesting the characteristics of thermally activated delayed fluorescence (TADF). The electroluminescence (EL) device employing CPTBF:m-CN (CPTBF:p-CN) blend as the emitting layer (EML) achieved an EQE of 5.22% (2.05%) with the EL λ_max centered at 607 nm (625 nm). The exciplex excitons can be efficiently extracted by a new benzobisthiadiazole-based near-infrared (NIR) emitter DCzPBBT, where a device is configured with CPTBF:m-CN: (5 wt.%) DCzPBBT as the EML to achieve a high EQE of 5.32% and an EL λ_max 758 nm. Further increase of the doping concentration to 10 wt.% of DCzPBBT exhibits a bathochromic shifted EL λ_max to 772 nm with 94% spectral coverage in the NIR (>700 nm) region, while the device EQE retains at 4.06%. The superior device performance stems from the highly efficient energy transfer between the exciplex-forming host and NIR dopant together.

Original language	English
Article number	2303131
Journal	Advanced Optical Materials
Volume	12
Issue number	16
DOIs	https://doi.org/10.1002/adom.202303131
Publication status	Published - 2024 Jun 6

Keywords

exciplex
intermolecular charge transfer
near-infrared
thermally activated delayed fluorescence

ASJC Scopus subject areas

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

Access to Document

10.1002/adom.202303131

Cite this

Chen, Y. Y., Kung, Y. C., Wang, M., Lo, Y. C., Chia, Y. T., Wang, C. K., Chen, D. G., Cheng, J. T., Chou, P. T., Wu, C., Li, E. Y., Hu, B., Hung, W. Y., & Wong, K. T. (2024). High-Efficiency Near-Infrared OLED Enabled by Exciplex-Forming Hosts and a New Organic Fluorescent Emitter. Advanced Optical Materials, 12(16), Article 2303131. https://doi.org/10.1002/adom.202303131

@article{4fe8be30dc254b279c071f4ee3256a82,

title = "High-Efficiency Near-Infrared OLED Enabled by Exciplex-Forming Hosts and a New Organic Fluorescent Emitter",

abstract = "Two blends comprising new dicyanopyrazine-based acceptors (m-CN and p-CN) and a carbazole-based donor CPTBF are explored for exciplex formation. The CPTBF:m-CN and CPTBF:p-CN blends show the signature red-shifted emission together with the delayed fluorescence observed in time-resolved measurement, manifesting the characteristics of thermally activated delayed fluorescence (TADF). The electroluminescence (EL) device employing CPTBF:m-CN (CPTBF:p-CN) blend as the emitting layer (EML) achieved an EQE of 5.22% (2.05%) with the EL λmax centered at 607 nm (625 nm). The exciplex excitons can be efficiently extracted by a new benzobisthiadiazole-based near-infrared (NIR) emitter DCzPBBT, where a device is configured with CPTBF:m-CN: (5 wt.%) DCzPBBT as the EML to achieve a high EQE of 5.32% and an EL λmax 758 nm. Further increase of the doping concentration to 10 wt.% of DCzPBBT exhibits a bathochromic shifted EL λmax to 772 nm with 94% spectral coverage in the NIR (>700 nm) region, while the device EQE retains at 4.06%. The superior device performance stems from the highly efficient energy transfer between the exciplex-forming host and NIR dopant together.",

keywords = "exciplex, intermolecular charge transfer, near-infrared, thermally activated delayed fluorescence",

author = "Chen, {Yi Yun} and Kung, {Yu Cheng} and Miaosheng Wang and Lo, {Yuan Chih} and Chia, {Yao Te} and Wang, {Chun Kai} and Chen, {Deng Gao} and Cheng, {Ju Ting} and Chou, {Pi Tai} and Chichi Wu and Li, {Elise Y.} and Bin Hu and Hung, {Wen Yi} and Wong, {Ken Tsung}",

note = "Publisher Copyright: {\textcopyright} 2024 Wiley-VCH GmbH.",

year = "2024",

month = jun,

day = "6",

doi = "10.1002/adom.202303131",

language = "English",

volume = "12",

journal = "Advanced Optical Materials",

issn = "2195-1071",

publisher = "John Wiley and Sons Inc.",

number = "16",

}

TY - JOUR

T1 - High-Efficiency Near-Infrared OLED Enabled by Exciplex-Forming Hosts and a New Organic Fluorescent Emitter

AU - Chen, Yi Yun

AU - Kung, Yu Cheng

AU - Wang, Miaosheng

AU - Lo, Yuan Chih

AU - Chia, Yao Te

AU - Wang, Chun Kai

AU - Chen, Deng Gao

AU - Cheng, Ju Ting

AU - Chou, Pi Tai

AU - Wu, Chichi

AU - Li, Elise Y.

AU - Hu, Bin

AU - Hung, Wen Yi

AU - Wong, Ken Tsung

PY - 2024/6/6

Y1 - 2024/6/6

N2 - Two blends comprising new dicyanopyrazine-based acceptors (m-CN and p-CN) and a carbazole-based donor CPTBF are explored for exciplex formation. The CPTBF:m-CN and CPTBF:p-CN blends show the signature red-shifted emission together with the delayed fluorescence observed in time-resolved measurement, manifesting the characteristics of thermally activated delayed fluorescence (TADF). The electroluminescence (EL) device employing CPTBF:m-CN (CPTBF:p-CN) blend as the emitting layer (EML) achieved an EQE of 5.22% (2.05%) with the EL λmax centered at 607 nm (625 nm). The exciplex excitons can be efficiently extracted by a new benzobisthiadiazole-based near-infrared (NIR) emitter DCzPBBT, where a device is configured with CPTBF:m-CN: (5 wt.%) DCzPBBT as the EML to achieve a high EQE of 5.32% and an EL λmax 758 nm. Further increase of the doping concentration to 10 wt.% of DCzPBBT exhibits a bathochromic shifted EL λmax to 772 nm with 94% spectral coverage in the NIR (>700 nm) region, while the device EQE retains at 4.06%. The superior device performance stems from the highly efficient energy transfer between the exciplex-forming host and NIR dopant together.

AB - Two blends comprising new dicyanopyrazine-based acceptors (m-CN and p-CN) and a carbazole-based donor CPTBF are explored for exciplex formation. The CPTBF:m-CN and CPTBF:p-CN blends show the signature red-shifted emission together with the delayed fluorescence observed in time-resolved measurement, manifesting the characteristics of thermally activated delayed fluorescence (TADF). The electroluminescence (EL) device employing CPTBF:m-CN (CPTBF:p-CN) blend as the emitting layer (EML) achieved an EQE of 5.22% (2.05%) with the EL λmax centered at 607 nm (625 nm). The exciplex excitons can be efficiently extracted by a new benzobisthiadiazole-based near-infrared (NIR) emitter DCzPBBT, where a device is configured with CPTBF:m-CN: (5 wt.%) DCzPBBT as the EML to achieve a high EQE of 5.32% and an EL λmax 758 nm. Further increase of the doping concentration to 10 wt.% of DCzPBBT exhibits a bathochromic shifted EL λmax to 772 nm with 94% spectral coverage in the NIR (>700 nm) region, while the device EQE retains at 4.06%. The superior device performance stems from the highly efficient energy transfer between the exciplex-forming host and NIR dopant together.

KW - exciplex

KW - intermolecular charge transfer

KW - near-infrared

KW - thermally activated delayed fluorescence

UR - http://www.scopus.com/inward/record.url?scp=85184725980&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85184725980&partnerID=8YFLogxK

U2 - 10.1002/adom.202303131

DO - 10.1002/adom.202303131

M3 - Article

AN - SCOPUS:85184725980

SN - 2195-1071

VL - 12

JO - Advanced Optical Materials

JF - Advanced Optical Materials

IS - 16

M1 - 2303131

ER -

High-Efficiency Near-Infrared OLED Enabled by Exciplex-Forming Hosts and a New Organic Fluorescent Emitter

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this