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

dos Santos, Paloma Lays Lays and Silveira, Orlando José and Huang, Rogjuan and Jardim, Guilherme and Matos, Matheus Josue Souza and da Silva Júnior, Eufrânio N. and Monkman, Andrew P and Dias, Fernando B. and Cury, Luiz Alberto (2019) 'Dynamics of aggregated states resolved by gated fluorescence in films of room temperature phosphorescent emitters.', Physical chemistry chemical physics., 21 (7). pp. 3814-3821.

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.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1039/C8CP07005A
Date accepted:17 January 2019
Date deposited:21 February 2019
Date of first online publication:22 January 2019
Date first made open access:17 January 2020

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