Rausch, Andreas F. and Murphy, Lisa and Williams, J. A. Gareth and Yersin, Hartmut (2009) Probing the Excited State Properties of the Highly Phosphorescent Pt(dpyb)Cl Compound by High-Resolution Optical Spectroscopy. INORGANIC CHEMISTRY, 48 (23). pp. 11407-11414. ISSN 0020-1669, 1520-510X
Full text not available from this repository. (Request a copy)Abstract
Detailed photophysical studies of the emitting triplet state of the highly phosphorescent compound Pt(dpyb)Cl based on high-resolution optical spectroscopy at cryogenic temperatures are presented {dpyb = N<boolean AND>C-2<boolean AND>N-coordinated 1,3-di(pyridylbenzene)}. The results reveal a total zero-field splitting of the emitting triplet state T-1 of 10 cm(-1) and relatively short individual decay times for the two higher lying T-1 substates II and III, while the decay time of the lowest substate I is distinctly longer. Further evidence for the assignment of the T-1 substates is gained by emission measurements under high magnetic fields, Distinct differences are observed in the vibrational satellite structures of the emissions from the substates I and II, which are dominated by Herzberg-Teller and Franck-Condon activity, respectively. At T=1.2 K, the individual spectra of these two substates can be separated by time-resolved spectroscopy. For the most prominent Franck-Condon active modes, Huang-Rhys parameters of S approximate to 0.1 can be determined, which are characteristic of very small geometry rearrangements between the singlet ground state and the triplet state T-1. The similar geometries are ascribed to the high rigidity of the Pt(N<boolean AND>C<boolean AND>N) system which, unlike complexes incorporating bidentate phenylpyridine-type ligands and exhibiting similar metal-to-ligand charge transfer admixtures, cannot readily distort from planarity. The results provide new insight into strategies for optimizing the performance of platinum-based emitters for applications such as organic light-emitting diode (OLED) technology and imaging.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LIGHT-EMITTING-DIODES; SPIN-LATTICE-RELAXATION; COORDINATED PLATINUM(II) COMPLEXES; CHARGE-TRANSFER STATES; TRIPLET-STATE; PHOTOPHYSICAL PROPERTIES; TEMPERATURE-DEPENDENCE; TRIDENTATE LIGANDS; EMISSION; 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: | 27 Aug 2020 10:12 |
| Last Modified: | 27 Aug 2020 10:12 |
| URI: | https://pred.uni-regensburg.de/id/eprint/27986 |
Actions (login required)
 |
View Item |
