Dynamics of aggregated states resolved by gated fluorescence in films of room temperature phosphorescent emitters

dos Santos, Paloma Lays Lays; Silveira, Orlando José; Huang, Rogjuan; Jardim, Guilherme; Matos, Matheus Josue Souza; da Silva Júnior, Eufrânio N.; Monkman, Andrew P; Dias, Fernando B.; Cury, Luiz Alberto

Abstract

Phenazine derivative molecules were studied using steady state and time resolved fluorescence techniques and demonstrated to lead to strong formation of aggregated species, identified as dimers by time dependent density functional theory calculations. Blended films in a matrix of Zeonex®, produced at different concentrations, showed different contributions of dimer and monomer emissions in a prompt time frame, e.g. less than 50 ns. In contrast, the phosphorescence (e.g. emission from the triplet state) shows no significant effect on dimer formation, although strong dependence of the phosphorescence intensity on concentration is observed, leading to phosphorescence being quenched at higher concentration.

Citation

dos Santos, P. L. L., Silveira, O. J., Huang, R., Jardim, G., Matos, M. J. S., da Silva Júnior, E. N., Monkman, A. P., Dias, F. B., & Cury, L. A. (2019). Dynamics of aggregated states resolved by gated fluorescence in films of room temperature phosphorescent emitters. Physical Chemistry Chemical Physics, 21(7), 3814-3821. https://doi.org/10.1039/c8cp07005a

• Journal Article Type: Article
• Acceptance Date: Jan 17, 2019
• Online Publication Date: Jan 22, 2019
• Publication Date: Feb 21, 2019
• Deposit Date: Jan 29, 2019
• Publicly Available Date: Jan 17, 2020
• Journal: Physical Chemistry Chemical Physics
• Print ISSN: 1463-9076
• Electronic ISSN: 1463-9084
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 21
• Issue: 7
• Pages: 3814-3821
• DOI: https://doi.org/10.1039/c8cp07005a
• Public URL: https://durham-repository.worktribe.com/output/1304429