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N-Rich Electron Acceptor: Triplet Harvesting in Multichromophoric Pyridoquinoxaline and Pyridopyrazine-Based Organic Emitters

preprint
submitted on 27.02.2020 and posted on 28.02.2020 by BAHADUR SK, Samarth Sharma, Anto James, Subhankar Kundu, Abhijit Patra

Control of nonradiative deactivation of triplet states and tuning the singlet-triplet energy gap (ΔEST) are the major challenges to develop materials exhibiting thermally activated delayed fluorescence (TADF) and room temperature phosphorescence (RTP). Herein, we propose a new class of multichromophoric tridonor-acceptor (D3-A) compounds with rigid and flexible π-spacer having N-rich pyridoquinoxaline (PQ) and pyridopyrazine (PZ) acceptor core, respectively. The molecule with carbazole (Cz) donors at meta to quinoxaline (QX) nitrogen of rigid PQ core exhibits TADF. Whereas, the variation of the linkage position of Cz to PQ as well as twisted and flexible PZ core show predominantly RTP due to relatively higher singlet-triplet energy gap (ΔEST). Increasing the donor strength with phenoxazine (PO) in PZ system leads to simultaneous TADF and RTP. Further, we demonstrate the promising scope of all-organic triplet harvesting materials in solid-state security encryption.


Funding

BRNS, DAE (No. 37(2)/14/06/2016BRNS/37020)

Council of Scientific and Industrial Research (CSIR), New Delhi, (No. 01(2878)/17/EMR-II)

History

Email Address of Submitting Author

abhijit@iiserb.ac.in

Institution

Indian Institute of Science Education and Research Bhopal

Country

India

ORCID For Submitting Author

0000-0003-3144-1813

Declaration of Conflict of Interest

No conflict of interest

Version Notes

Preprint_TADF-RTP_27.02.2020

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