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Room temperature phosphorescence vs thermally activated delayed fluorescence in carbazole – pyrimidine cored compounds

Abstract

Utilization of “dark” triplet states is a key task for design of novel emissive organic compounds. Thermally activated delayed fluorescence (TADF) and room temperature phosphorescence (RTP) are two promising pathways to employ triplet excitons and reach high internal quantum efficiencies. In this paper we present a series of carbazole – pyrimidine cored compounds, showing RTP and TADF. Specific energy level scheme was shown to promote intersystem crossing and RTP in carbazole – pyrimidine derivatives with phosphorescence quantum yield values up to 0.07 in rigid Zeonex films. The modification of acceptor core with 2-methylthio and dimethylamine fragments allowed to reduce singlet – triplet energy gap, enhance reverse intersystem crossing rate and obtain high intensity TADF with fluorescence quantum yield up to 0.32. Time resolved fluorescence analysis revealed the presence of conformational disorder of donor – acceptor core governing TADF properties in solid films. The method of control the conformational disorder by enhancing host rigidity was demonstrated. Sky-blue electroluminescence was shown for dimethylamino-modified compound with the most intense TADF. Our results show that carbazole-pyrimidine cored materials are versatile donor – acceptor system for achieving RTP and TADF via simple structural modifications.

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Publication details

The article was received on 25 May 2018, accepted on 11 Sep 2018 and first published on 12 Sep 2018


Article type: Paper
DOI: 10.1039/C8TC02554A
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Room temperature phosphorescence vs thermally activated delayed fluorescence in carbazole – pyrimidine cored compounds

    T. Serevičius, T. Buciunas, J. Bucevičius, J. Dodonova, S. Tumkevicius, K. Kazlauskas and S. Jursenas, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC02554A

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