Synthesis, structural characterization and rigidity dependent dual phosphorescence behavior of high-energy phosphorescent zinc( ii ) cyclic (alkyl)(amino)carbene complexes
Abstract
LLCT (LLCT = ligand-to-ligand charge transfer) states both at room temperature and at 77 K, complex 11 and the tetrameric compounds exhibit excitation wavelength-dependent unusual high-energy UV-blue phosphorescence and green-yellow luminescence. The experimental data suggest that high-energy excitation leads to emission primarily from high-energy states due to strong Franck-Condon overlaps, while low-energy excitation enables direct triplet state population and geometry-driven transitions. This behavior, influenced by the molecular rigidity, appears to be the result of an equilibrium between different excited states and emphasizes the impact of the molecular structure on the emission profiles.
Fields of Study & Subjects
Organic Light-Emitting Diodes Research
Luminescence and Fluorescent Materials
N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
Publication details
- Journal / source
- Dalton Transactions
- Volume
- 55
- Issue
- 14
- Pages
- 5519–5528
- Publication date
- 1 January 2026
- Language
- EN