Intramolecular spatial charge transfer enhances TADF efficiency

Baoyi Ren; Chuantian Zuo; Yaguang Sun; Liming Ding

doi:10.1088/1674-4926/42/5/050201

J. Semicond. > 2021, Volume 42 > Issue 5 > 050201

RESEARCH HIGHLIGHTS

Intramolecular spatial charge transfer enhances TADF efficiency

Baoyi Ren¹, Chuantian Zuo², Yaguang Sun^1, and Liming Ding^2,

+ Author Affiliations

1. College of Science, Shenyang University of Chemical Technology, Shenyang 110142, China
2. Center for Excellence in Nanoscience (CAS), Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS), National Center for Nanoscience and Technology, Beijing 100190, China

Author Bio:

Baoyi Ren received his BS degree in Applied Chemistry from Northeast Normal University and PhD degree in Chemical Metallurgy from Northeastern University in 2012. He has been working at Shenyang University of Chemical Technology since 2000. He was a visiting scholar (2016–2017) at Lawrence Berkeley National Laboratory. He has been an associate professor since 2014. His research focuses on OLEDs and photovoltaics.

Chuantian Zuo received his PhD degree in 2018 from National Center for Nanoscience and Technology (CAS) under the supervision of Professor Liming Ding. Then he did postdoctoral research in CSIRO, Australia. Currently, he is an assistant professor in Liming Ding Group. His research focuses on innovative materials and devices.

Yaguang Sun received his PhD degree from Northeastern University. Now he is a full professor at Shenyang University of Chemical Technology. His research focuses on the synthesis of MOF/COF-based micro-nano crystals for catalysis.

Liming Ding got his PhD from University of Science and Technology of China (was a joint student at Changchun Institute of Applied Chemistry, CAS). He started his research on OSCs and PLEDs in Olle Inganäs Lab in 1998. Later on, he worked at National Center for Polymer Research, Wright-Patterson Air Force Base and Argonne National Lab (USA). He joined Konarka as a Senior Scientist in 2008. In 2010, he joined National Center for Nanoscience and Technology as a full professor. His research focuses on functional materials and devices. He is RSC Fellow, the nominator for Xplorer Prize, and the Associate Editors for Science Bulletin and Journal of Semiconductors.

Corresponding author: Yaguang Sun, sunyaguang@syuct.edu.cn; Liming Ding, ding@nanoctr.cn

DOI: 10.1088/1674-4926/42/5/050201

References

[1]	Uoyama H, Goushi K, Shizu K, et al. Highly efficient organic light-emitting diodes from delayed fluorescence. Nature, 2012, 492, 234 doi: 10.1038/nature11687
[2]	Yang Z, Mao Z, Xie Z, et al. Recent advances in organic thermally activated delayed fluorescence materials. Chem Soc Rev, 2017, 46, 915 doi: 10.1039/C6CS00368K
[3]	Tsujimoto H, Ha D G, Markopoulos G, et al. Thermally activated delayed fluorescence and aggregation induced emission with through-space charge transfer. J Am Chem Soc, 2017, 139, 4894 doi: 10.1021/jacs.7b00873
[4]	Tang X, Cui L S, Li H C, et al. Highly efficient luminescence from space-confined charge-transfer emitters. Nat Mater, 2020, 19, 1332 doi: 10.1038/s41563-020-0710-z
[5]	Yang S Y, Tian Q S, Yu Y J, et al. Sky-blue thermally activated delayed fluorescence with intramolecular spatial charge transfer based on a dibenzothiophene sulfone emitter. J Org Chem, 2020, 85, 10628 doi: 10.1021/acs.joc.0c01200
[6]	Yang S Y, Wang Y K, Peng C C, et al. Circularly polarized thermally activated delayed fluorescence emitters in through-space charge transfer on asymmetric spiro skeletons. J Am Chem Soc, 2020, 142, 17756 doi: 10.1021/jacs.0c08980
[7]	Wada Y, Nakagawa H, Matsumoto S, et al. Organic light emitters exhibiting very fast reverse intersystem crossing. Nat Photonics, 2020, 14, 643 doi: 10.1038/s41566-020-0667-0
[8]	Wu C, Liu W, Li K, et al. Face-to-face orientation of quasiplanar donor and acceptor enables highly efficient intramolecular exciplex fluorescence. Angew Chem Int Ed, 2021, 60, 3994 doi: 10.1002/anie.202013051
[9]	Wang X Q, Yang S Y, Tian Q S, et al. Multi-layer π-stacked molecules as efficient thermally activated delayed fluorescence emitters. Angew Chem Int Ed, 2021, 60, 5213 doi: 10.1002/anie.202011384

Fig. 1. (Color online) (a) Through-bond charge transfer. Reproduced with permission^[3], Copyright 2017, American Chemical Society. (b) Through-space charge transfer. Reproduced with permission^[9], Copyright 2021, Wiley-VCH. (c) The ISCT-TADF emitters^{[3, 4, 6–9]}. d: D–A distance. Reproduced with permissions^{[6, 8]}, Copyright 2020, American Chemical Society and Wiley-VCH.

DownLoad: Full-Size Img PowerPoint

Table 1. ISCT-TADF emitters cited in this article.

Emitter	λ_PL(nm)	PLQY (%)	k_RISC(s⁻¹)	k_R(s⁻¹)	HOMO (eV)	LUMO (eV)	ΔE_ST(eV)	EL performance		Ref.
Emitter	λ_PL(nm)	PLQY (%)	k_RISC(s⁻¹)	k_R(s⁻¹)	HOMO (eV)	LUMO (eV)	ΔE_ST(eV)	λ_EL/CIE (nm)/(x, y)	EQE_max(%)	Ref.
XPT	566	66.0	−	−	−4.99	−3.15	0.001	584/−	10.0	[3]
DM-B	493	78.0	0.18 × 10⁶	6.75 × 10⁶	−6.38	−0.71	0.170	488/(0.20, 0.44)	27.4	[4]
SFOT	512	89.0	1.17 × 10⁵	−	−5.13	−2.91	0.053	508/−	23.1	[6]
TpAT-tFFO	485	98.0	1.20 × 10⁷	1.10 × 10⁶	−6.47	−0.90	0.019	498/(0.20, 0.44)	19.2	[7]
DPXZ-BO	511	99.0	2.10 × 10⁵	2.36 × 10⁶	−5.08	−1.98	0.030	−/(0.26, 0.58)	23.9	[8]
DM-BD1	495	94.2	0.29 × 10⁶	4.41 × 10⁶	−5.36	−1.99	0.050	−/(0.21, 0.47)	28.0	[9]
DM-BD2	495	92.8	0.31 × 10⁶	3.03 × 10⁶	−5.30	−1.95	0.040	−/(0.20, 0.46)	26.6	[9]

DownLoad: CSV

[1]	Uoyama H, Goushi K, Shizu K, et al. Highly efficient organic light-emitting diodes from delayed fluorescence. Nature, 2012, 492, 234 doi: 10.1038/nature11687
[2]	Yang Z, Mao Z, Xie Z, et al. Recent advances in organic thermally activated delayed fluorescence materials. Chem Soc Rev, 2017, 46, 915 doi: 10.1039/C6CS00368K
[3]	Tsujimoto H, Ha D G, Markopoulos G, et al. Thermally activated delayed fluorescence and aggregation induced emission with through-space charge transfer. J Am Chem Soc, 2017, 139, 4894 doi: 10.1021/jacs.7b00873
[4]	Tang X, Cui L S, Li H C, et al. Highly efficient luminescence from space-confined charge-transfer emitters. Nat Mater, 2020, 19, 1332 doi: 10.1038/s41563-020-0710-z
[5]	Yang S Y, Tian Q S, Yu Y J, et al. Sky-blue thermally activated delayed fluorescence with intramolecular spatial charge transfer based on a dibenzothiophene sulfone emitter. J Org Chem, 2020, 85, 10628 doi: 10.1021/acs.joc.0c01200
[6]	Yang S Y, Wang Y K, Peng C C, et al. Circularly polarized thermally activated delayed fluorescence emitters in through-space charge transfer on asymmetric spiro skeletons. J Am Chem Soc, 2020, 142, 17756 doi: 10.1021/jacs.0c08980
[7]	Wada Y, Nakagawa H, Matsumoto S, et al. Organic light emitters exhibiting very fast reverse intersystem crossing. Nat Photonics, 2020, 14, 643 doi: 10.1038/s41566-020-0667-0
[8]	Wu C, Liu W, Li K, et al. Face-to-face orientation of quasiplanar donor and acceptor enables highly efficient intramolecular exciplex fluorescence. Angew Chem Int Ed, 2021, 60, 3994 doi: 10.1002/anie.202013051
[9]	Wang X Q, Yang S Y, Tian Q S, et al. Multi-layer π-stacked molecules as efficient thermally activated delayed fluorescence emitters. Angew Chem Int Ed, 2021, 60, 5213 doi: 10.1002/anie.202011384