Finkenzeller, Walter J. and Thompson, Mark E. and Yersin, Hartmut (2007) Phosphorescence dynamics and spin-lattice relaxation of the OLED emitter Ir(btp)(2)(acac). CHEMICAL PHYSICS LETTERS, 444 (4-6). pp. 273-279. ISSN 0009-2614,
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The lowest triplet state T-1 of Ir(btP)(2)(acac) doped into CH2Cl2 is studied by site-selective and time-resolving emission and by excitation spectroscopy at cryogenic temperatures. Different sites due to different environments of Ir(btP)(2)(acac) show dissimilar intensity distributions of the substate emissions, zero-field splittings, emission decay times, and spin-lattice relaxation (SLR) times. Temperature dependent investigations of the SLR processes reveal the importance of the direct process and the Orbach process. Moreover, the emitting T-1 state is assigned as (LC)-L-3 (ligand-centered) state with significant (MLCT)-M-1,3 (metal-to-ligand charge transfer) perturbation. This classification is related to the usability of phosphorescent emitters in OLEDs. (C) 2007 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CYCLOMETALATED IRIDIUM COMPLEXES; LYING ELECTRONIC STATES; TEMPERATURE-DEPENDENCE; ORGANIC-MOLECULES; DECAY DYNAMICS; EXCITED-STATES; EFFICIENCY; DEVICES; EMISSION; BTP(2)IR(ACAC); |
| 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: | 01 Dec 2020 13:54 |
| Last Modified: | 01 Dec 2020 13:54 |
| URI: | https://pred.uni-regensburg.de/id/eprint/32374 |
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