Artem'ev, Alexander V. and Shafikov, Marsel Z. and Schinabeck, Alexander and Antonova, Olga V. and Berezin, Alexey S. and Bagryanskaya, Irina Yu. and Plusnin, Pavel E. and Yersin, Hartmut (2019) Sky-blue thermally activated delayed fluorescence (TADF) based on Ag(I) complexes: strong solvation-induced emission enhancement. INORGANIC CHEMISTRY FRONTIERS, 6 (11). pp. 3168-3176. ISSN 2052-1553,
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A new Ag(I) complex based on tris(2-pyridyl)phosphine (Py3P), [Ag-2(Py3P)(3)(SCN)(2)], has been synthesized and chemically characterized. Theoretical calculations and photophysical investigations reveal thermally activated delayed fluorescence (TADF) coupled with outstanding solvato- and vapor-luminescent behavior. The parent complex [Ag-2(Py3P)(3)(SCN)(2)] shows sky-blue TADF (lambda(max) = 469 nm) at ambient temperature with a quantum yield of Phi(PL) = 16% and an emission decay time of 2.2 mu s. Upon exposing the complex to CH2Cl2 or CHCl3 vapors, [Ag-2(Py3P)(3)(SCN)(2)]center dot 0.66CH(2)Cl(2) and [Ag-2(Py3P)(3)(SCN)(2)]center dot CHCl3 solvates are formed. This process is accompanied by a strong enhancement of the luminescence intensity. Both solvates also emit sky-blue TADF (lambda(max) = 478-483 nm), but the emission quantum yield reaches Phi(PL) approximate to 70% at an emission decay time of 9-12 mu s, depending on the solvent. According to DFT/TD-DFT computations, the observed TADF originates from a (1)(M + X)LCT excited state. The experimentally determined Delta E(S-1 - T-1) gap for [Ag-2(Py3P)(3)(SCN)(2)]center dot 0.66CH(2)Cl(2) is relatively large and amounts to 1040 cm(-1) (approximate to 129 meV).
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LIGHT-EMITTING-DIODES; CU(I) COMPLEXES; PHOTOLUMINESCENCE PROPERTIES; COORDINATION POLYMERS; SILVER(I) COMPLEXES; TRIPLET EMITTERS; DESIGN STRATEGY; BASIS-SETS; CU-I; LUMINESCENCE; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry III - Physical Chemistry (Molecular Spectroscopy and Photochemistry) > Prof. Dr. Hartmut Yersin |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 25 Mar 2020 09:22 |
| Last Modified: | 25 Mar 2020 09:22 |
| URI: | https://pred.uni-regensburg.de/id/eprint/25869 |
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