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

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dc.contributor.authorDimitriev, Oleg
dc.contributor.authorKysil, Dmytro
dc.contributor.authorZaderko, Alexander
dc.contributor.authorIsaieva, Oksana
dc.contributor.authorVasin, Andrii
dc.contributor.authorPiryatinski, Yuri
dc.contributor.authorFahlman, Mats
dc.contributor.authorNazarov, Alexei
dc.date.accessioned2024-04-29T05:02:35Z
dc.date.available2024-04-29T05:02:35Z
dc.date.issued2024
dc.description.abstractCarbon dots (CDs) are recognized as promising fluorescent nanomaterials with bright emission and large variations of photoluminescence quantum yield (PLQY). However, there is still no unique approach for explanation of mechanisms and recipes for synthetic procedures/chemical composition of CDs responsible for the enhancement of PLQY. Here, we compare photophysical behavior and PLQY of two types of CDs synthesized by different routes, leading to the different extent of oxidation and composition. The first type of CDs represents a conjugated carbon system oxidized by F, N and O heteroatoms, whereas the second type represents a non-conjugated carbon system oxidized by oxygen. Photophysical data, photoemission spectroscopy and microscopy data yield the suggestion that in the first case, a structure with a distinct carbon core and highly oxidized electron-accepting shell is formed. This leads to the excitonic type non-tunable emission with single-exponent decay and high PLQY with a strong dependence on the solvent polarity, being as high as 93% in dioxane and as low as 30% in aqueous medium, but which is vulnerable to photobleaching. In the second case, the oxidized CDs do not indicate a clear core–shell structure and show poor solvatochromism, negligible photobleaching, low PLQY varying in the range of 0.7–2.3% depending on the solvent used, and tunable emission with multi-exponent decay, which can be described by the model of multiple emission centers acting through a clustering-triggered emission mechanism. The obtained results lead to a strategy that allows one to design carbon nanomaterials with principally different PLQYs that differ by orders of magnitude.en_US
dc.identifier.citationPhotoluminescence quantum yield of carbon dots: emission due to multiple centers versus excitonic emission / Oleg Dimitriev, Dmytro Kysil, Alexander Zaderko, Oksana Isaieva, Andrii Vasin, Yuri Piryatinski, Mats Fahlman, Alexei Nazarov // Nanoscale Advances. - 2024. - 18 р. - https://doi.org/10.1039/D4NA00033Aen_US
dc.identifier.issn2185–2197
dc.identifier.urihttps://doi.org/10.1039/D4NA00033A
dc.identifier.urihttps://ekmair.ukma.edu.ua/handle/123456789/29253
dc.language.isoenen_US
dc.relation.sourceNanoscale Advancesen_US
dc.statusfirst publisheduk_UA
dc.subjectcarbon dots (CDs)en_US
dc.subjectphotoluminescenceen_US
dc.subjectemission due to multiple centersen_US
dc.subjectPLQYen_US
dc.subjectarticleen_US
dc.titlePhotoluminescence quantum yield of carbon dots: emission due to multiple centers versus excitonic emissionen_US
dc.typeArticleuk_UA
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