Finkenzeller, W. J. and Stossel, P and Yersin, Hartmut (2004) Emission and absorption of Ir(ppy)(2)(CO)(Cl) - temperature dependence, phosphorescence decay dynamics, and assignment of excited states. CHEMICAL PHYSICS LETTERS, 397 (4-6). pp. 289-295. ISSN 0009-2614, 1873-4448
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Emission spectra and decay times of Ir(ppy)(2)(CO)(Cl) dissolved in THF were recorded for 1.2 K less than or equal to T less than or equal to 300 K. The emission stems from a triplet state T-1 which is split into three substates by less than 1 cm(-1). We classify this state as (LC)-L-3(ligand centered, ppypipi*) state. At T = 1.2 K, the substates emit independently with three individual decay times (tau(I) = 300 mus, tau(II) = 85 mus, tau(III) = 9 mus) due to slow equilibration processes, i.e. slow spin-lattice-relaxation, between the substates. With increasing temperature, the emission decay becomes monoexponential as a result of fast equilibration. The results are compared to the spectroscopic behavior of Ir(ppy)(3) which represents a metal-to-ligand charge transfer (MLCT)-M-3 emitter. (C) 2004 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | DETECTED MAGNETIC-RESONANCE; LIGHT-EMITTING DEVICES; ELECTRONIC STATES; CHARGE-TRANSFER; IR(III) COMPLEXES; PT(II) COMPOUNDS; TRIPLET-STATE; SPECTROSCOPY; RELAXATION; (2,2'-BIPYRIDINE)IRIDIUM(III); |
| 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: | 28 Jun 2021 04:35 |
| Last Modified: | 28 Jun 2021 04:35 |
| URI: | https://pred.uni-regensburg.de/id/eprint/37077 |
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