Achievement of high efficiency with extremely low efficiency roll-off in solution-processed thermally activated delayed fluorescence OLEDs manufactured using xanthone-based bipolar host materials

Chae Yeong Kim; Chiho Lee; Hyung Jong Kim; Jinhyo Hwang; Mallesham Godumala; Ji Eun Jeong; Han Young Woo; Min Ju Cho; Sungnam Park; Dong Hoon Choi

doi:10.1039/d0tc01144d

Achievement of high efficiency with extremely low efficiency roll-off in solution-processed thermally activated delayed fluorescence OLEDs manufactured using xanthone-based bipolar host materials

Chae Yeong Kim, Chiho Lee, Hyung Jong Kim, Jinhyo Hwang, Mallesham Godumala, Ji Eun Jeong, Han Young Woo, Min Ju Cho, Sungnam Park, Dong Hoon Choi

Department of Chemistry

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

11 Citations (Scopus)

Abstract

The use of soluble host materials and thermally activated delayed fluorescence (TADF) emitters is indispensable for developing high-efficiency organic light-emitting diodes (OLEDs) by cost-effective solution processes. In this study, two bipolar hosts were designed as structural isomers, namely 3-(3,5-di(9H-carbazol-9-yl)phenyl)-9H-xanthen-9-one (Xp-mCP) and 2-(3,5-di(9H-carbazol-9-yl)phenyl)-9H-xanthen-9-one (Xm-mCP). The two host materials were synthesized by combining the unipolar host, 1,3-di(9H-carbazol-9-yl)benzene (mCP) with 9H-xanthen-9-one as an electron-accepting moiety. The two hosts exhibit good solubility in various organic solvents and high triplet energy (E_T= 2.67 eV forXp-mCPandE_T= 2.82 eV forXm-mCP), which renders them suitable for t4CzIPN-containing solution-processable green TADF-OLEDs. The maximum external quantum efficiency (EQE) values were 19.3% and 22.0% forXp-mCP- andXm-mCP-based green TADF-OLED, respectively. Among them, the device comprisingXm-mCPshowed an excellent efficiency roll-off behavior by displaying only a 4.5% decrease and 11.4% decrease at 1000 cd m^-2and 2000 cd m^-2, respectively. These results show the significant potential of xanthone-mCP host materials to develop solution-processable OLED technologies.

Original language	English
Pages (from-to)	6780-6787
Number of pages	8
Journal	Journal of Materials Chemistry C
Volume	8
Issue number	20
DOIs	https://doi.org/10.1039/d0tc01144d
Publication status	Published - 2020 May 28

ASJC Scopus subject areas

Chemistry(all)
Materials Chemistry

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10.1039/d0tc01144d

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Kim, C. Y., Lee, C., Kim, H. J., Hwang, J., Godumala, M., Jeong, J. E., Woo, H. Y., Cho, M. J., Park, S., & Choi, D. H. (2020). Achievement of high efficiency with extremely low efficiency roll-off in solution-processed thermally activated delayed fluorescence OLEDs manufactured using xanthone-based bipolar host materials. Journal of Materials Chemistry C, 8(20), 6780-6787. https://doi.org/10.1039/d0tc01144d

Achievement of high efficiency with extremely low efficiency roll-off in solution-processed thermally activated delayed fluorescence OLEDs manufactured using xanthone-based bipolar host materials. / Kim, Chae Yeong; Lee, Chiho; Kim, Hyung Jong; Hwang, Jinhyo; Godumala, Mallesham; Jeong, Ji Eun; Woo, Han Young; Cho, Min Ju; Park, Sungnam ; Choi, Dong Hoon.

In: Journal of Materials Chemistry C, Vol. 8, No. 20, 28.05.2020, p. 6780-6787.

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

Kim, CY, Lee, C, Kim, HJ, Hwang, J, Godumala, M, Jeong, JE, Woo, HY, Cho, MJ, Park, S & Choi, DH 2020, 'Achievement of high efficiency with extremely low efficiency roll-off in solution-processed thermally activated delayed fluorescence OLEDs manufactured using xanthone-based bipolar host materials', Journal of Materials Chemistry C, vol. 8, no. 20, pp. 6780-6787. https://doi.org/10.1039/d0tc01144d

Kim, Chae Yeong ; Lee, Chiho ; Kim, Hyung Jong ; Hwang, Jinhyo ; Godumala, Mallesham ; Jeong, Ji Eun ; Woo, Han Young ; Cho, Min Ju ; Park, Sungnam ; Choi, Dong Hoon. / Achievement of high efficiency with extremely low efficiency roll-off in solution-processed thermally activated delayed fluorescence OLEDs manufactured using xanthone-based bipolar host materials. In: Journal of Materials Chemistry C. 2020 ; Vol. 8, No. 20. pp. 6780-6787.

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title = "Achievement of high efficiency with extremely low efficiency roll-off in solution-processed thermally activated delayed fluorescence OLEDs manufactured using xanthone-based bipolar host materials",

abstract = "The use of soluble host materials and thermally activated delayed fluorescence (TADF) emitters is indispensable for developing high-efficiency organic light-emitting diodes (OLEDs) by cost-effective solution processes. In this study, two bipolar hosts were designed as structural isomers, namely 3-(3,5-di(9H-carbazol-9-yl)phenyl)-9H-xanthen-9-one (Xp-mCP) and 2-(3,5-di(9H-carbazol-9-yl)phenyl)-9H-xanthen-9-one (Xm-mCP). The two host materials were synthesized by combining the unipolar host, 1,3-di(9H-carbazol-9-yl)benzene (mCP) with 9H-xanthen-9-one as an electron-accepting moiety. The two hosts exhibit good solubility in various organic solvents and high triplet energy (ET= 2.67 eV forXp-mCPandET= 2.82 eV forXm-mCP), which renders them suitable for t4CzIPN-containing solution-processable green TADF-OLEDs. The maximum external quantum efficiency (EQE) values were 19.3% and 22.0% forXp-mCP- andXm-mCP-based green TADF-OLED, respectively. Among them, the device comprisingXm-mCPshowed an excellent efficiency roll-off behavior by displaying only a 4.5% decrease and 11.4% decrease at 1000 cd m-2and 2000 cd m-2, respectively. These results show the significant potential of xanthone-mCP host materials to develop solution-processable OLED technologies.",

author = "Kim, {Chae Yeong} and Chiho Lee and Kim, {Hyung Jong} and Jinhyo Hwang and Mallesham Godumala and Jeong, {Ji Eun} and Woo, {Han Young} and Cho, {Min Ju} and Sungnam Park and Choi, {Dong Hoon}",

note = "Funding Information: The authors acknowledge the financial support from the National Research Foundation of Korea (NRF2019R1A2C2002647 and NRF2019R1A6A1A11044070) and LG Display (2019). Also thanks to the Korea Basic Science Institute in Seoul for allowing us to use MALDI-TOF MS instrument.",

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doi = "10.1039/d0tc01144d",

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AU - Kim, Chae Yeong

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AU - Hwang, Jinhyo

AU - Godumala, Mallesham

AU - Jeong, Ji Eun

AU - Woo, Han Young

AU - Cho, Min Ju

AU - Park, Sungnam

AU - Choi, Dong Hoon

N1 - Funding Information: The authors acknowledge the financial support from the National Research Foundation of Korea (NRF2019R1A2C2002647 and NRF2019R1A6A1A11044070) and LG Display (2019). Also thanks to the Korea Basic Science Institute in Seoul for allowing us to use MALDI-TOF MS instrument.

PY - 2020/5/28

Y1 - 2020/5/28

N2 - The use of soluble host materials and thermally activated delayed fluorescence (TADF) emitters is indispensable for developing high-efficiency organic light-emitting diodes (OLEDs) by cost-effective solution processes. In this study, two bipolar hosts were designed as structural isomers, namely 3-(3,5-di(9H-carbazol-9-yl)phenyl)-9H-xanthen-9-one (Xp-mCP) and 2-(3,5-di(9H-carbazol-9-yl)phenyl)-9H-xanthen-9-one (Xm-mCP). The two host materials were synthesized by combining the unipolar host, 1,3-di(9H-carbazol-9-yl)benzene (mCP) with 9H-xanthen-9-one as an electron-accepting moiety. The two hosts exhibit good solubility in various organic solvents and high triplet energy (ET= 2.67 eV forXp-mCPandET= 2.82 eV forXm-mCP), which renders them suitable for t4CzIPN-containing solution-processable green TADF-OLEDs. The maximum external quantum efficiency (EQE) values were 19.3% and 22.0% forXp-mCP- andXm-mCP-based green TADF-OLED, respectively. Among them, the device comprisingXm-mCPshowed an excellent efficiency roll-off behavior by displaying only a 4.5% decrease and 11.4% decrease at 1000 cd m-2and 2000 cd m-2, respectively. These results show the significant potential of xanthone-mCP host materials to develop solution-processable OLED technologies.

AB - The use of soluble host materials and thermally activated delayed fluorescence (TADF) emitters is indispensable for developing high-efficiency organic light-emitting diodes (OLEDs) by cost-effective solution processes. In this study, two bipolar hosts were designed as structural isomers, namely 3-(3,5-di(9H-carbazol-9-yl)phenyl)-9H-xanthen-9-one (Xp-mCP) and 2-(3,5-di(9H-carbazol-9-yl)phenyl)-9H-xanthen-9-one (Xm-mCP). The two host materials were synthesized by combining the unipolar host, 1,3-di(9H-carbazol-9-yl)benzene (mCP) with 9H-xanthen-9-one as an electron-accepting moiety. The two hosts exhibit good solubility in various organic solvents and high triplet energy (ET= 2.67 eV forXp-mCPandET= 2.82 eV forXm-mCP), which renders them suitable for t4CzIPN-containing solution-processable green TADF-OLEDs. The maximum external quantum efficiency (EQE) values were 19.3% and 22.0% forXp-mCP- andXm-mCP-based green TADF-OLED, respectively. Among them, the device comprisingXm-mCPshowed an excellent efficiency roll-off behavior by displaying only a 4.5% decrease and 11.4% decrease at 1000 cd m-2and 2000 cd m-2, respectively. These results show the significant potential of xanthone-mCP host materials to develop solution-processable OLED technologies.

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Achievement of high efficiency with extremely low efficiency roll-off in solution-processed thermally activated delayed fluorescence OLEDs manufactured using xanthone-based bipolar host materials

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