Structural isomers of 9-(pyridin-2-yl)-9H-carbazole in combination with 9′H-9,3':6′,9″-tercarbazole and their application to high efficiency solution processed green TADF OLEDs

Jinhyo Hwang; Jiwon Yoon; Chae Yeong Kim; Suna Choi; Hyunchul Kang; Jun Yun Kim; Dae Wi Yoon; Chang Wook Han; Sungnam Park; Min Ju Cho; Dong Hoon Choi

doi:10.1016/j.dyepig.2020.108403

Structural isomers of 9-(pyridin-2-yl)-9H-carbazole in combination with 9′H-9,3':6′,9″-tercarbazole and their application to high efficiency solution processed green TADF OLEDs

Jinhyo Hwang, Jiwon Yoon, Chae Yeong Kim, Suna Choi, Hyunchul Kang, Jun Yun Kim, Dae Wi Yoon, Chang Wook Han, Sungnam Park, Min Ju Cho, Dong Hoon Choi

Department of Chemistry

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

5 Citations (Scopus)

Abstract

Two host materials, CzPy2TCz and CzPy3TCz, were designed as structural isomers and synthesized to achieve high efficiency thermally activated delayed fluorescence-organic light emitting diodes (TADF-OLEDs). The design strategy involved introducing a pyridine group into the core structure as an electron-withdrawing unit and varying the substitution position of tercarbazole (TCz). To realize green TADF-OLED, the two host materials synthesized in this study have excellent thermal stability and high excited triplet energy (T₁ = 2.95–2.98 eV). The maximum external quantum efficiency and current efficiency values for CzPy2TCz were 23.81% and 80.2 cd/A, respectively and the respective values for CzPy3TCz were 20.27% and 70.1 cd/A, respectively. Structural isomers with carbazole (Cz) and TCz units at the 2,6-position of the pyridine core effectuate better device performance. Consequently, we found that the host materials introduced in this study play an important role in implementing high performing solution-processed green TADF-OLED.

Original language	English
Article number	108403
Journal	Dyes and Pigments
Volume	179
DOIs	https://doi.org/10.1016/j.dyepig.2020.108403
Publication status	Published - 2020 Aug

Keywords

Host material
Organic light-emitting diode
Pyridine
Solution process
Tercarbazole
Thermally activated delayed fluorescence

ASJC Scopus subject areas

Chemical Engineering(all)
Process Chemistry and Technology

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10.1016/j.dyepig.2020.108403

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Hwang, J., Yoon, J., Kim, C. Y., Choi, S., Kang, H., Kim, J. Y., Yoon, D. W., Han, C. W., Park, S., Cho, M. J., & Choi, D. H. (2020). Structural isomers of 9-(pyridin-2-yl)-9H-carbazole in combination with 9′H-9,3':6′,9″-tercarbazole and their application to high efficiency solution processed green TADF OLEDs. Dyes and Pigments, 179, [108403]. https://doi.org/10.1016/j.dyepig.2020.108403

Structural isomers of 9-(pyridin-2-yl)-9H-carbazole in combination with 9′H-9,3':6′,9″-tercarbazole and their application to high efficiency solution processed green TADF OLEDs. / Hwang, Jinhyo; Yoon, Jiwon; Kim, Chae Yeong; Choi, Suna; Kang, Hyunchul; Kim, Jun Yun; Yoon, Dae Wi; Han, Chang Wook; Park, Sungnam; Cho, Min Ju; Choi, Dong Hoon.

In: Dyes and Pigments, Vol. 179, 108403, 08.2020.

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

Hwang, J, Yoon, J, Kim, CY, Choi, S, Kang, H, Kim, JY, Yoon, DW, Han, CW, Park, S, Cho, MJ & Choi, DH 2020, 'Structural isomers of 9-(pyridin-2-yl)-9H-carbazole in combination with 9′H-9,3':6′,9″-tercarbazole and their application to high efficiency solution processed green TADF OLEDs', Dyes and Pigments, vol. 179, 108403. https://doi.org/10.1016/j.dyepig.2020.108403

Hwang, Jinhyo ; Yoon, Jiwon ; Kim, Chae Yeong ; Choi, Suna ; Kang, Hyunchul ; Kim, Jun Yun ; Yoon, Dae Wi ; Han, Chang Wook ; Park, Sungnam ; Cho, Min Ju ; Choi, Dong Hoon. / Structural isomers of 9-(pyridin-2-yl)-9H-carbazole in combination with 9′H-9,3':6′,9″-tercarbazole and their application to high efficiency solution processed green TADF OLEDs. In: Dyes and Pigments. 2020 ; Vol. 179.

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title = "Structural isomers of 9-(pyridin-2-yl)-9H-carbazole in combination with 9′H-9,3':6′,9″-tercarbazole and their application to high efficiency solution processed green TADF OLEDs",

abstract = "Two host materials, CzPy2TCz and CzPy3TCz, were designed as structural isomers and synthesized to achieve high efficiency thermally activated delayed fluorescence-organic light emitting diodes (TADF-OLEDs). The design strategy involved introducing a pyridine group into the core structure as an electron-withdrawing unit and varying the substitution position of tercarbazole (TCz). To realize green TADF-OLED, the two host materials synthesized in this study have excellent thermal stability and high excited triplet energy (T1 = 2.95–2.98 eV). The maximum external quantum efficiency and current efficiency values for CzPy2TCz were 23.81% and 80.2 cd/A, respectively and the respective values for CzPy3TCz were 20.27% and 70.1 cd/A, respectively. Structural isomers with carbazole (Cz) and TCz units at the 2,6-position of the pyridine core effectuate better device performance. Consequently, we found that the host materials introduced in this study play an important role in implementing high performing solution-processed green TADF-OLED.",

keywords = "Host material, Organic light-emitting diode, Pyridine, Solution process, Tercarbazole, Thermally activated delayed fluorescence",

author = "Jinhyo Hwang and Jiwon Yoon and Kim, {Chae Yeong} and Suna Choi and Hyunchul Kang and Kim, {Jun Yun} and Yoon, {Dae Wi} and Han, {Chang Wook} and Sungnam Park and Cho, {Min Ju} and Choi, {Dong Hoon}",

note = "Funding Information: This research was supported by National Research Foundation of Korea ( NRF-2019R1A2C2002647 and 2019R1A6A1A11044070 ), and D. H. Choi particularly thanks for the support from LG Display Co. Limited ( Q1927051 , 2020 ). Funding Information: This research was supported by National Research Foundation of Korea (NRF-2019R1A2C2002647 and 2019R1A6A1A11044070), and D. H. Choi particularly thanks for the support from LG Display Co. Limited (Q1927051, 2020). Publisher Copyright: {\textcopyright} 2020",

year = "2020",

month = aug,

doi = "10.1016/j.dyepig.2020.108403",

language = "English",

volume = "179",

journal = "Dyes and Pigments",

issn = "0143-7208",

publisher = "Elsevier BV",

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TY - JOUR

T1 - Structural isomers of 9-(pyridin-2-yl)-9H-carbazole in combination with 9′H-9,3':6′,9″-tercarbazole and their application to high efficiency solution processed green TADF OLEDs

AU - Hwang, Jinhyo

AU - Yoon, Jiwon

AU - Kim, Chae Yeong

AU - Choi, Suna

AU - Kang, Hyunchul

AU - Kim, Jun Yun

AU - Yoon, Dae Wi

AU - Han, Chang Wook

AU - Park, Sungnam

AU - Cho, Min Ju

AU - Choi, Dong Hoon

N1 - Funding Information: This research was supported by National Research Foundation of Korea ( NRF-2019R1A2C2002647 and 2019R1A6A1A11044070 ), and D. H. Choi particularly thanks for the support from LG Display Co. Limited ( Q1927051 , 2020 ). Funding Information: This research was supported by National Research Foundation of Korea (NRF-2019R1A2C2002647 and 2019R1A6A1A11044070), and D. H. Choi particularly thanks for the support from LG Display Co. Limited (Q1927051, 2020). Publisher Copyright: © 2020

PY - 2020/8

Y1 - 2020/8

N2 - Two host materials, CzPy2TCz and CzPy3TCz, were designed as structural isomers and synthesized to achieve high efficiency thermally activated delayed fluorescence-organic light emitting diodes (TADF-OLEDs). The design strategy involved introducing a pyridine group into the core structure as an electron-withdrawing unit and varying the substitution position of tercarbazole (TCz). To realize green TADF-OLED, the two host materials synthesized in this study have excellent thermal stability and high excited triplet energy (T1 = 2.95–2.98 eV). The maximum external quantum efficiency and current efficiency values for CzPy2TCz were 23.81% and 80.2 cd/A, respectively and the respective values for CzPy3TCz were 20.27% and 70.1 cd/A, respectively. Structural isomers with carbazole (Cz) and TCz units at the 2,6-position of the pyridine core effectuate better device performance. Consequently, we found that the host materials introduced in this study play an important role in implementing high performing solution-processed green TADF-OLED.

AB - Two host materials, CzPy2TCz and CzPy3TCz, were designed as structural isomers and synthesized to achieve high efficiency thermally activated delayed fluorescence-organic light emitting diodes (TADF-OLEDs). The design strategy involved introducing a pyridine group into the core structure as an electron-withdrawing unit and varying the substitution position of tercarbazole (TCz). To realize green TADF-OLED, the two host materials synthesized in this study have excellent thermal stability and high excited triplet energy (T1 = 2.95–2.98 eV). The maximum external quantum efficiency and current efficiency values for CzPy2TCz were 23.81% and 80.2 cd/A, respectively and the respective values for CzPy3TCz were 20.27% and 70.1 cd/A, respectively. Structural isomers with carbazole (Cz) and TCz units at the 2,6-position of the pyridine core effectuate better device performance. Consequently, we found that the host materials introduced in this study play an important role in implementing high performing solution-processed green TADF-OLED.

KW - Host material

KW - Organic light-emitting diode

KW - Pyridine

KW - Solution process

KW - Tercarbazole

KW - Thermally activated delayed fluorescence

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U2 - 10.1016/j.dyepig.2020.108403

DO - 10.1016/j.dyepig.2020.108403

M3 - Article

AN - SCOPUS:85082853456

VL - 179

JO - Dyes and Pigments

JF - Dyes and Pigments

SN - 0143-7208

M1 - 108403

ER -

Structural isomers of 9-(pyridin-2-yl)-9H-carbazole in combination with 9′H-9,3':6′,9″-tercarbazole and their application to high efficiency solution processed green TADF OLEDs

Abstract

Keywords

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