Reduction of the singlet–triplet energy gap of a thermally activated delayed fluorescence emitter by molecular interaction between the host and the emitter

L. Xie; G. Han; Y. Chen; H. Wang; X. Kong; X. Wei; J. Liu; Y. Yi; B. Chen; P. Wang; Y. Wang

doi:10.1039/C6TC03155B

Reduction of the singlet–triplet energy gap of a thermally activated delayed fluorescence emitter by molecular interaction between the host and the emitter†

L. Xie,^ab G. Han,^cd Y. Chen,^ad H. Wang,^ae X. Kong,^ad X. Wei,^ad J. Liu,^ad Y. Yi,^cd B. Chen,^b P. Wang^ad and Y. Wang

*^ad

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* Corresponding authors

^a Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, China
E-mail: wangy@mail.ipc.ac.cn

^b College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China

^c Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China

^d University of Chinese Academy of Sciences, Beijing, China

^e Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an 710069, China

Abstract

We reported the comparative effect of 1,3-bis(9H-carbazol-9-yl) benzene (mCP) and 1,3,5-tris(N-phenylbenzimidazole-2-yl)benzene (TPBI) hosts on the PL characteristics of 2-phenyl-4′-carbazole-9H-thioxanthen-9-one-10,10-dioxide (TXO-PhCz). Strong interaction between TXO-PhCz and TPBI can be observed, leading to the lower singlet–triplet energy gap of 8.8 meV and non-monotonic increase of Φ_Totle, Φ_D, and Φ_P with temperature. OLEDs based on TXO-PhCz:TPBI films afford a maximum current efficiency of 71.9 cd A⁻¹, a maximum power efficiency of 45.2 lm W⁻¹, and a maximum EQE of 23.2%.

Journal of Materials Chemistry C

Reduction of the singlet–triplet energy gap of a thermally activated delayed fluorescence emitter by molecular interaction between the host and the emitter†

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Reduction of the singlet–triplet energy gap of a thermally activated delayed fluorescence emitter by molecular interaction between the host and the emitter

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