Yersin, Hartmut and Rausch, Andreas F. and Czerwieniec, Rafal and Hofbeck, Thomas and Fischer, Tobias (2011) The triplet state of organo-transition metal compounds. Triplet harvesting and singlet harvesting for efficient OLEDs. COORDINATION CHEMISTRY REVIEWS, 255 (21-22). pp. 2622-2652. ISSN 0010-8545, 1873-3840
Full text not available from this repository. (Request a copy)Abstract
Based on a very comprehensive set of experimental data and on theoretical models, an understanding of the triplet state properties of organo-transition metal compounds is worked out. Important trends and guidelines for controlling photophysical properties are revealed. In this respect, we focus on spin-orbit coupling (SOC) and its importance for radiative as well as for nonradiative transitions between the lowest triplet state and the electronic ground state. Moreover, as is discussed on the basis of an extensive data set, summarized for the first time, the efficiency of SOC also depends on the geometry of a complex. The investigations are exemplified and supported by instructive case studies, such as efficient blue and very efficient green and red emitters. Additionally, trends being important for applications of these compounds as emitters in OLEDs are worked out. In particular, the properties of the emitters are discussed with respect to the harvesting of singlet and triplet excitons that are generated in the course of the electroluminescence process. The well-known triplet harvesting effect is compared to the recently discovered singlet harvesting effect. This latter mechanism is illustrated by use of a blue light emitting Cu(I) complex, which represents an efficient fluorescent emitter at ambient temperature. By this mechanism, 100% of the generated singlet and triplet excitons can, at least in principle, be harvested by the emitting singlet state. Potentially, this new mechanism can successfully be applied in future OLED lighting with a distinctly reduced roll-off of the efficiency. (C) 2011 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LIGHT-EMITTING-DIODES; DETECTED MAGNETIC-RESONANCE; TRANSFER EXCITED-STATES; ENERGY-GAP LAW; CYCLOMETALATED PLATINUM COMPLEXES; INTRALIGAND CHARGE-TRANSFER; LOCALIZED (3)PI-PI(ASTERISK) STATE; RESOLUTION OPTICAL SPECTROSCOPY; DENSITY-FUNCTIONAL THEORY; LYING ELECTRONIC STATES; Singlet harvesting; Triplet harvesting; Triplet emitters; OLED emitters; Spin-orbit coupling; Organo-transition metal compounds; Triplet state; Triplet substates; Radiative decay; Nonradiative decay; Nonradiative decay and spin-orbit coupling; Spin-orbit coupling and geometry; Emission quantum yields |
| 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: | Petra Gürster |
| Date Deposited: | 06 May 2020 06:01 |
| Last Modified: | 06 May 2020 06:01 |
| URI: | https://pred.uni-regensburg.de/id/eprint/19939 |
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