High-efficiency orange thermally activated delayed fluorescence by secondary acceptor modification

J. X. Zhou; X. Y. Zeng; F. M. Xie; Y. H. He; Y. Q. Tang; Y. Q. Li; J. X. Tang

doi:10.1016/j.mtener.2021.100819

High-efficiency orange thermally activated delayed fluorescence by secondary acceptor modification

J. X. Zhou
, X. Y. Zeng
, F. M. Xie
, Y. H. He
, Y. Q. Tang
, Y. Q. Li^*
, J. X. Tang^*

^*Corresponding author for this work

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

5 Scopus citations

Abstract

The secondary donor/acceptor has significant effects on the excited-state properties and efficiencies of thermally activated delayed fluorescent (TADF) emitters. Here, we use two electron-withdrawing units (cyanobenzene and trifluoromethylbenzene) as a secondary acceptor to control the electron-withdrawing ability of the dibenzo[a,c]phenazine (BP) acceptor core based on the BP-triphenylamine (TPA) backbone. The synthesized orange-red TADF emitters (CN-BP-TPA and CF3-BP-TPA) exhibit the singlet-triplet energy splitting (ΔE_ST) values of 0.19 and 0.23 eV, respectively. Both emitters show a high photoluminescence quantum yield up to 92%–98% in the doped films. The organic light-emitting diodes (OLEDs) based on CN-BP-TPA achieve the external quantum efficiency of 26.0%, power efficiency of 76.8 lm/W, and current efficiency of 61.1 cd/A as compared with 16.6%, 59.2 lm/W, and 50.9 cd/A of the CF3-BP-TPA counterpart. In addition, the non-doped OLED involving the non-doped CN-BP-TPA emitter shows an ultralow turn-on voltage of 2.2 V and an external quantum efficiency of 5.0%.

Original language	English
Article number	100819
Journal	Materials Today Energy
Volume	21
DOIs	https://doi.org/10.1016/j.mtener.2021.100819
State	Published - Sep 2021
Externally published	Yes

Keywords

Hetero-acceptor units
High photoluminescence quantum yield
OLED
Orange emission
TADF emitters

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.mtener.2021.100819

Cite this

@article{e97dd41a6f694c42ad6045fb1eadc68c,

title = "High-efficiency orange thermally activated delayed fluorescence by secondary acceptor modification",

abstract = "The secondary donor/acceptor has significant effects on the excited-state properties and efficiencies of thermally activated delayed fluorescent (TADF) emitters. Here, we use two electron-withdrawing units (cyanobenzene and trifluoromethylbenzene) as a secondary acceptor to control the electron-withdrawing ability of the dibenzo[a,c]phenazine (BP) acceptor core based on the BP-triphenylamine (TPA) backbone. The synthesized orange-red TADF emitters (CN-BP-TPA and CF3-BP-TPA) exhibit the singlet-triplet energy splitting (ΔEST) values of 0.19 and 0.23 eV, respectively. Both emitters show a high photoluminescence quantum yield up to 92\%–98\% in the doped films. The organic light-emitting diodes (OLEDs) based on CN-BP-TPA achieve the external quantum efficiency of 26.0\%, power efficiency of 76.8 lm/W, and current efficiency of 61.1 cd/A as compared with 16.6\%, 59.2 lm/W, and 50.9 cd/A of the CF3-BP-TPA counterpart. In addition, the non-doped OLED involving the non-doped CN-BP-TPA emitter shows an ultralow turn-on voltage of 2.2 V and an external quantum efficiency of 5.0\%.",

keywords = "Hetero-acceptor units, High photoluminescence quantum yield, OLED, Orange emission, TADF emitters",

author = "Zhou, \{J. X.\} and Zeng, \{X. Y.\} and Xie, \{F. M.\} and He, \{Y. H.\} and Tang, \{Y. Q.\} and Li, \{Y. Q.\} and Tang, \{J. X.\}",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd",

year = "2021",

month = sep,

doi = "10.1016/j.mtener.2021.100819",

language = "英语",

volume = "21",

journal = "Materials Today Energy",

issn = "2468-6069",

publisher = "Elsevier Ltd",

}

TY - JOUR

T1 - High-efficiency orange thermally activated delayed fluorescence by secondary acceptor modification

AU - Zhou, J. X.

AU - Zeng, X. Y.

AU - Xie, F. M.

AU - He, Y. H.

AU - Tang, Y. Q.

AU - Li, Y. Q.

AU - Tang, J. X.

PY - 2021/9

Y1 - 2021/9

N2 - The secondary donor/acceptor has significant effects on the excited-state properties and efficiencies of thermally activated delayed fluorescent (TADF) emitters. Here, we use two electron-withdrawing units (cyanobenzene and trifluoromethylbenzene) as a secondary acceptor to control the electron-withdrawing ability of the dibenzo[a,c]phenazine (BP) acceptor core based on the BP-triphenylamine (TPA) backbone. The synthesized orange-red TADF emitters (CN-BP-TPA and CF3-BP-TPA) exhibit the singlet-triplet energy splitting (ΔEST) values of 0.19 and 0.23 eV, respectively. Both emitters show a high photoluminescence quantum yield up to 92%–98% in the doped films. The organic light-emitting diodes (OLEDs) based on CN-BP-TPA achieve the external quantum efficiency of 26.0%, power efficiency of 76.8 lm/W, and current efficiency of 61.1 cd/A as compared with 16.6%, 59.2 lm/W, and 50.9 cd/A of the CF3-BP-TPA counterpart. In addition, the non-doped OLED involving the non-doped CN-BP-TPA emitter shows an ultralow turn-on voltage of 2.2 V and an external quantum efficiency of 5.0%.

AB - The secondary donor/acceptor has significant effects on the excited-state properties and efficiencies of thermally activated delayed fluorescent (TADF) emitters. Here, we use two electron-withdrawing units (cyanobenzene and trifluoromethylbenzene) as a secondary acceptor to control the electron-withdrawing ability of the dibenzo[a,c]phenazine (BP) acceptor core based on the BP-triphenylamine (TPA) backbone. The synthesized orange-red TADF emitters (CN-BP-TPA and CF3-BP-TPA) exhibit the singlet-triplet energy splitting (ΔEST) values of 0.19 and 0.23 eV, respectively. Both emitters show a high photoluminescence quantum yield up to 92%–98% in the doped films. The organic light-emitting diodes (OLEDs) based on CN-BP-TPA achieve the external quantum efficiency of 26.0%, power efficiency of 76.8 lm/W, and current efficiency of 61.1 cd/A as compared with 16.6%, 59.2 lm/W, and 50.9 cd/A of the CF3-BP-TPA counterpart. In addition, the non-doped OLED involving the non-doped CN-BP-TPA emitter shows an ultralow turn-on voltage of 2.2 V and an external quantum efficiency of 5.0%.

KW - Hetero-acceptor units

KW - High photoluminescence quantum yield

KW - OLED

KW - Orange emission

KW - TADF emitters

UR - https://www.scopus.com/pages/publications/85112587537

U2 - 10.1016/j.mtener.2021.100819

DO - 10.1016/j.mtener.2021.100819

M3 - 文章

AN - SCOPUS:85112587537

SN - 2468-6069

VL - 21

JO - Materials Today Energy

JF - Materials Today Energy

M1 - 100819

ER -

High-efficiency orange thermally activated delayed fluorescence by secondary acceptor modification

Abstract

Keywords

UN SDGs

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