Dinuclear Cu(I) Complex with Combined Bright TADF and Phosphorescence. Zero-Field Splitting and Spin-Lattice Relaxation Effects of the Triplet State

The Journal of Physical Chemistry Letters
Alexander SchinabeckHartmut Yersin

Abstract

The three-fold bridged dinuclear Cu(I) complex Cu2(μ-I)2(1 N- n-butyl-5-diphenyl-phosphino-1,2,4-triazole)3, Cu2I2(P^N)3, shows bright thermally activated delayed fluorescence (TADF) as well as phosphorescence at ambient temperature with a total quantum yield of 85% at an emission decay time of 7 μs. The singlet (S1)-triplet (T1) energy gap is as small as only 430 cm-1 (53 meV). Spin-orbit coupling induces a short-lived phosphorescence with a decay time of 52 μs ( T = 77 K) and a distinct zero-field splitting (ZFS) of T1 into substates by ∼2.5 cm-1 (0.3 meV). Below T ≈ 10 K, effects of spin-lattice relaxation (SLR) are observed and agree with the size of ZFS. According to the combined phosphorescence and TADF, the overall emission decay time is reduced by ∼13% as compared to the TADF-only process. The compound may potentially be applied in solution-processed OLEDs, exploiting both the singlet and triplet harvesting mechanisms.

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Citations

Jan 17, 2020·Chemical Society Reviews·Guangfu LiMartin R Bryce
Feb 23, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Andrey Yu BaranovAlexander V Artem'ev
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Jan 11, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Ji-Hui JiaCan-Zhong Lu
Nov 23, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Alexander SchinabeckHartmut Yersin
Apr 30, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Aleksandra V PaderinaElena V Grachova
Apr 22, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Chun-Hua HuangCan-Zhong Lu
Jun 17, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Katerina A VinogradovaMark B Bushuev
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Feb 23, 2020·The Journal of Physical Chemistry Letters·Li-Rui XingDan Li
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Dec 23, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Alexander V Artem'evIrina Yu Bagryanskaya

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