Achieving Efficient Triplet Exciton Utilization with Large ΔEST and Nonobvious Delayed Fluorescence by Adjusting Excited State Energy Levels
Publication type: Journal Article
Publication date: 2018-08-01
scimago Q1
wos Q1
SJR: 1.394
CiteScore: 8.7
Impact factor: 4.6
ISSN: 19487185
PubMed ID:
30066563
Physical and Theoretical Chemistry
General Materials Science
Abstract
Enhancing the rate of reverse intersystem crossing ( krisc) and the rate of radiative transition ( kr) has been regarded as the key to improve molecular design strategy in the field of thermally activated delayed fluorescence (TADF) materials. Herein, two sky-blue donor-acceptor (D-A)-type TADF materials, namely, CzDCNPy and tBuCzDCNPy, were designed following a strategy of controlling the energy difference among the charge-transfer singlet state (1CT), local exciton triplet state (3LE), and charge-transfer triplet state (3CT). Significantly different from most previously reported TADF materials, large values of kr and krisc and a nearly 100% exciton utilization efficiency were simultaneously achieved despite nonobvious delayed fluorescence and a large value of the singlet-triplet energy difference (Δ EST) being observed. This work presents a view that photoinduced delayed fluorescence and a small Δ EST are sufficient but not necessary for TADF materials. It also provides a reference that the high-energy 3LE state plays a key role in the RISC process in electroluminescence.
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Gan L. et al. Achieving Efficient Triplet Exciton Utilization with Large ΔEST and Nonobvious Delayed Fluorescence by Adjusting Excited State Energy Levels // Journal of Physical Chemistry Letters. 2018. Vol. 9. No. 16. pp. 4725-4731.
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Gan L., GAO K., Cai X., Chen D., Su S. Achieving Efficient Triplet Exciton Utilization with Large ΔEST and Nonobvious Delayed Fluorescence by Adjusting Excited State Energy Levels // Journal of Physical Chemistry Letters. 2018. Vol. 9. No. 16. pp. 4725-4731.
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RIS
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TY - JOUR
DO - 10.1021/acs.jpclett.8b01961
UR - https://doi.org/10.1021/acs.jpclett.8b01961
TI - Achieving Efficient Triplet Exciton Utilization with Large ΔEST and Nonobvious Delayed Fluorescence by Adjusting Excited State Energy Levels
T2 - Journal of Physical Chemistry Letters
AU - Gan, Lin
AU - GAO, KUO
AU - Cai, Xinyi
AU - Chen, Dongcheng
AU - Su, Shijian
PY - 2018
DA - 2018/08/01
PB - American Chemical Society (ACS)
SP - 4725-4731
IS - 16
VL - 9
PMID - 30066563
SN - 1948-7185
ER -
Cite this
BibTex (up to 50 authors)
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@article{2018_Gan,
author = {Lin Gan and KUO GAO and Xinyi Cai and Dongcheng Chen and Shijian Su},
title = {Achieving Efficient Triplet Exciton Utilization with Large ΔEST and Nonobvious Delayed Fluorescence by Adjusting Excited State Energy Levels},
journal = {Journal of Physical Chemistry Letters},
year = {2018},
volume = {9},
publisher = {American Chemical Society (ACS)},
month = {aug},
url = {https://doi.org/10.1021/acs.jpclett.8b01961},
number = {16},
pages = {4725--4731},
doi = {10.1021/acs.jpclett.8b01961}
}
Cite this
MLA
Copy
Gan, Lin, et al. “Achieving Efficient Triplet Exciton Utilization with Large ΔEST and Nonobvious Delayed Fluorescence by Adjusting Excited State Energy Levels.” Journal of Physical Chemistry Letters, vol. 9, no. 16, Aug. 2018, pp. 4725-4731. https://doi.org/10.1021/acs.jpclett.8b01961.