Understanding delayed fluorescence and triplet decays of Protoporphyrin IX under hypoxic conditions

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F21%3A43903653" target="_blank" >RIV/60076658:12310/21:43903653 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11320/21:10436521
Result on the web
<a href="https://link.springer.com/article/10.1007/s43630-021-00044-8" target="_blank" >https://link.springer.com/article/10.1007/s43630-021-00044-8</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s43630-021-00044-8" target="_blank" >10.1007/s43630-021-00044-8</a>

Result language
angličtina
Original language name
Understanding delayed fluorescence and triplet decays of Protoporphyrin IX under hypoxic conditions
Original language description
Photosensitizers of singlet oxygen exhibit three main types of reverse intersystem-crossing (RISC): thermally activated, triplet-triplet annihilation, and singlet oxygen feedback. RISC can be followed by delayed fluorescence (DF) emission, which can provide important information about the excited state dynamics in the studied system. An excellent model example is a widely used clinical photosensitizer Protoporphyrin IX, which manifests all three mentioned types of RISC and DF. Here, we estimated rate constants of individual RISC and DF processes in Protoporphyrin IX in dimethylformamide, and we showed how these affect triplet decays and DF signals under diverse experimental conditions, such as a varying oxygen concentration or excitation intensity. This provided a basis for a general discussion on guidelines for a more precise analysis of long-lived signals. Furthermore, it has been found that PpIX photoproducts and potential transient excited complexes introduce a new overlapping delayed luminescence spectral band with a distinct lifetime. These findings are important for design of more accurate biological oxygen sensors and assays based on DF and triplet lifetime.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10403 - Physical chemistry

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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