Photoluminescence quantum yield of carbon dots: emission due to multiple centers <i>versus</i> excitonic emission

Dimitriev, Oleg; Kysil, Dmytro; Zaderko, Alexander; Isaieva, Oksana; Vasin, Andrii; Piryatinski, Yuri; Fahlman, Mats; Nazarov, Alexei

doi:10.1039/d4na00033a

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2024

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Cited by 2 publications

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Carbon dots in the center of the spotlight: A full evaluation of their synthesis and understanding of their fundamental properties and applications

de Conti,

de Castro,

Assis

et al. 2024

Materials Today Sustainability

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Carbon dots in the center of the spotlight: A full evaluation of their synthesis and understanding of their fundamental properties and applications

de Conti,

de Castro,

Assis

et al. 2024

Materials Today Sustainability

View full text Add to dashboard Cite

Stress-assisted clustering-triggered emission of cellulose- based materials

Dimitriev,

Zhang,

Dávid

et al. 2024

Preprint

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Cellulose-based materials can be classified as non-conventional luminogens that produce photoluminescence (PL) in the visible range due to specific intermolecular arrangements. Usually such an arrangement is referred to as clusterization. Here, we demonstrate the importance of intramolecular arrangement of ethyl cellulose and bacterial cellulose that demonstrate tunable photoluminescence with multiexponent decay. We show that the observed emission is due to a n-π* electronic transition of carbonyl groups, whose emission intensity depends on the form of the sample preparation, either the powder-form or spin-coated films, displaying different density of the emitting regions on the microscale. Particularly, it is shown that PL emission is produced from disordered amorphous regions rather than from crystalline ones. We show that the emission is also promoted by mechanical stress applied to the sample that is suggested to facilitate formation of clusters of the carbonyl groups. The observed stress-assisted emission opens up the potential perspective of using this phenomenon in printed photonic devices.

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Photoluminescence quantum yield of carbon dots: emission due to multiple centers versus excitonic emission

Abstract: Photoluminescence quantum yield and solvatochromism of carbon dots greatly depend on their emission mechanism, either excitonic non-tunable with single-exponent decay or clustering-triggered tunable emission with multi-exponent decay.

Cited by 2 publications

References 58 publications

Carbon dots in the center of the spotlight: A full evaluation of their synthesis and understanding of their fundamental properties and applications

Carbon dots in the center of the spotlight: A full evaluation of their synthesis and understanding of their fundamental properties and applications

Stress-assisted clustering-triggered emission of cellulose- based materials

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