Controlling narrowband phosphorescence and delayed fluorescence by aggregate size
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Le résumé fourni par la source
Exciton coherence is a phenomenon involving collective electronic transition dipole moments of molecular aggregates with interesting photophysical behaviors such as superradiance and subradiance in J- and H-type aggregates, respectively. Although singlet aggregate excitons have been extensively studied, the understanding of triplet exciton coherence in terms of specific conditions is still lacking due to limited experimental observations. Here, by synthesizing model organic compounds of fluorene monomer, dimer, trimer, and polymer, we systematically studied their photoluminescence in both solution and aggregation states. Strong triplet exciton coherence is present in polyfluorene aggregates, including nanoparticles, microparticles, and thin films, and is manifested either as HJ-aggregate phosphorescence or delayed fluorescence depending on the size of these aggregates. Notably, in the phosphorescence state, the polyfluorene polymer exhibits an unusually sharp atomic-spectrum-like emission band with a narrow full width at half maximum (FWHM) of only 0.05 eV (14 nm) and the longest lifetime of 0.63 s. This study shows that the size of organic aggregates is essential in dictating organic exciton dynamics in the solid state and holds importance for the development of advanced optoelectronic technologies.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Controlling narrowband phosphorescence and delayed fluorescence by aggregate size
- Date Crossref
- 09/04/2026
- Éditeur
- Springer Science and Business Media LLC
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Hefei National Center for Physical Sciences at Nanoscale pays non établi dans la noticeStructure de recherche
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University of Science and Technology of China Hefei National Research Center for Physical Science at the Microscale pays non établi dans la noticeUniversité ou école supérieure
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Hefei University of Technology pays non établi dans la noticeUniversité ou école supérieure
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QuantumCTek (China) pays non établi dans la noticeEntreprise
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Hefei JiShu Quantum Technology Co. Ltd pays non établi dans la noticeEntreprise
Hefei National Center for Physical Sciences at Nanoscale, Hefei National Research Center for Physical Science at the Microscale — University of Science and Technology of China et Hefei University of Technology, avec 2 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.