دورية أكاديمية
The influence of nitrogen doping of the acceptor in orange–red thermally activated delayed fluorescence emitters and OLEDs
| العنوان: | The influence of nitrogen doping of the acceptor in orange–red thermally activated delayed fluorescence emitters and OLEDs |
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| المؤلفون: | Si, Changfeng, Hu, Ya-Nan, Sun, Dianming, Wang, Kai, Zhang, Xiaohong, Zysman-Colman, Eli |
| المصدر: | Si , C , Hu , Y-N , Sun , D , Wang , K , Zhang , X & Zysman-Colman , E 2023 , ' The influence of nitrogen doping of the acceptor in orange–red thermally activated delayed fluorescence emitters and OLEDs ' , Journal of Materials Chemistry C , vol. 11 , no. 36 , pp. 12174-12184 . https://doi.org/10.1039/D3TC02352DTest |
| سنة النشر: | 2023 |
| الوصف: | Nitrogen-containing polycyclic aromatic hydrocarbons (N-PAH) have been widely used as deep lowest unoccupied molecular orbital (LUMO) acceptors in donor-acceptor (D-A) red thermally activated delayed fluorescent (TADF) emitters and their use in organic light-emitting diodes. However, most of the studies have focused disparately on donor/acceptor combinations to yield efficient emitters, while it is rare that there is a methodological study to investigate the influence of the nitrogen (N) doping ratios on the ground and excited states of PAH acceptors. Here, we report a family of four different N-PAH acceptors containing different numbers of nitrogen atoms within the N-PAH and their use in D-A TADF emitters, DMACBP, DMACPyBP, DMACBPN and DMACPyBPN, when coupled to the same donor, 9,9-dimethyl-9,10-dihydroacridine (DMAC). As the nitrogen content in the acceptor increases the LUMO becomes progressively more stabilized while the singlet-triplet energy gap (ΔE ST ) decreases and the rate constant for reverse intersystem crossing (k RISC ) increases. In particular, introducing nitrogen at the 10-position of the dibenzo[a,c]phenazine (BP) leads to a more than ten-fold enhancement in kRISC in DMACPyBP and DMACPyBPN compared to DMACBP and DMACBPN. Among the OLEDs with all four emitters that with DMACBPN demonstrates the highest EQEmax of 19.4% at an emission peak of 588 nm. while the deepest red emitting device employed DMACPyBPN (λEL = 640 nm) with an EQE max of 5.4%. |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | application/pdf |
| اللغة: | English |
| العلاقة: | https://research-portal.st-andrews.ac.uk/en/researchoutput/the-influence-of-nitrogen-doping-of-the-acceptor-in-orangered-thermally-activated-delayed-fluorescence-emitters-and-oledsTest(d23bd7da-31e8-40ac-8492-b0661525b7a6).html |
| DOI: | 10.1039/D3TC02352D |
| الإتاحة: | https://doi.org/10.1039/D3TC02352DTest https://research-portal.st-andrews.ac.uk/en/researchoutput/the-influence-of-nitrogen-doping-of-the-acceptor-in-orangered-thermally-activated-delayed-fluorescence-emitters-and-oledsTest(d23bd7da-31e8-40ac-8492-b0661525b7a6).html https://research-repository.st-andrews.ac.uk/bitstream/10023/28345/1/Si_2023_JMCC_Nitrogendoping_CCBY.pdfTest |
| حقوق: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.E42C186D |
| قاعدة البيانات: | BASE |
| DOI: | 10.1039/D3TC02352D |
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