High efficiency green TADF emitters of acridine donor and triazine acceptor D-A-D structures
Two thermally activated delayed fluorescence (TADF) emitters with high synthetic yields were designed and synthesized. Both emitters, 10,10′-(5-(4,6-diphenyl-1,3,5-triazin-2-yl)-1,3-phenylene)bis(9,9-dimethyl-9,10-dihydroacridine) ( TRZ-DDMAc ) and 10,10′-(5-(4,6-diphenyl-1,3,5-triazin-2-yl)-1,3-phe...
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Published in | Journal of materials chemistry. C, Materials for optical and electronic devices Vol. 7; no. 25; pp. 7672 - 768 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Cambridge
Royal Society of Chemistry
2019
|
Subjects | |
Online Access | Get full text |
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Summary: | Two thermally activated delayed fluorescence (TADF) emitters with high synthetic yields were designed and synthesized. Both emitters, 10,10′-(5-(4,6-diphenyl-1,3,5-triazin-2-yl)-1,3-phenylene)bis(9,9-dimethyl-9,10-dihydroacridine) (
TRZ-DDMAc
) and 10,10′-(5-(4,6-diphenyl-1,3,5-triazin-2-yl)-1,3-phenylene)bis(9,9-diphenyl-9,10-dihydroacridine) (
TRZ-DDPAc
), showed excellent photophysical properties. Interestingly, both of the materials had a small energy difference between singlet and triplet levels, which confirmed that donor-acceptor based molecular design brought effective reverse intersystem crossing (RISC) to enable the TADF mechanism. The TADF characteristic was confirmed by a delay time of 10.32 and 10.37 μs for
TRZ-DDMAc
and
TRZ-DDPAc
, respectively.
TRZ-DDPAc
revealed a photoluminescence quantum yield of 79.7% in a doped film state. Moreover, several green OLED devices were fabricated by using different host materials along with various doping concentrations to ensure the optimal performance of each TADF material. The device with
TRZ-DDPAc
as an emitter (30%: DBFPO) exhibited excellent current and maximum external quantum efficiencies of 62.8 cd A
−1
and 27.3%, respectively. Green colour emission was observed from all devices, which originated through the TADF mechanism.
Two thermally activated delayed fluorescence (TADF) emitters with high synthetic yields were designed and synthesized. |
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Bibliography: | 10.1039/c9tc02491c Electronic supplementary information (ESI) available. See DOI |
ISSN: | 2050-7526 2050-7534 |
DOI: | 10.1039/c9tc02491c |