Optical and scintillation properties of hybrid manganese(<scp>ii</scp>) bromides with formamidinium and acetamidinium cations

Fateev, S.A.; Kozhevnikova, V.Y.; Kuznetsov, K.M.; Belikova, D.E.; Khrustalev, V.N.; Goodilin, E.A.; Tarasov, A.B.

Авторы: Fateev Sergey A., Kozhevnikova Vladislava Y., Kuznetsov Kirill M., Belikova Daria E., Khrustalev Victor N., Goodilin Eugene A., Tarasov Alexey B.
Журнал: Dalton Transactions
Год издания: 2024
Издательство: Royal Society of Chemistry
Местоположение издательства: United Kingdom
DOI: 10.1039/d3dt03452f
Аннотация: In recent years, hybrid manganese(II) halides (HMHs) have attracted wide attention due to their impressive optical properties, low toxicity, and facile synthetic processibility. Being effective reabsorption-free phosphors, these compounds demonstrate the potential to be used as low-cost solution-processable scintillators. However, most of the HMHs studied to date contain bulk organic cations and, as a result, are characterized by low density and low X-ray stopping power. For this reason, we studied manganese(II) bromides with compact organic cations such as formamidinium (FA+) and acetamidinium (AcA+). In particular, we synthesized four new phases, two of which are characterized by octahedral coordination of manganese ions ((FA)MnBr3 and (AcA)MnBr3) and red emission, whereas the other two have tetrahedrally coordinated Mn2+ ions ((FA)3MnBr5 and (AcA)2MnBr4) and green emission. Photoluminescence (PL) and radioluminescence measurements demonstrated high PL quantum yields and reasonable scintillation light yields of acetamidinium-based compounds. In addition, unlike most known HMH-based scintillators, the discovered materials have a relatively high density due to the small fraction of the volume occupied by organic cations, so their X-ray attenuation coefficients are comparable to the well-known oxide scintillators.
Добавил в систему: Фатеев Сергей Анатольевич

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