Abnormal Eu3+  - Eu2+ Reduction in Ca9-xMnxEu(PO4)7 Phosphors: Structure and Luminescent Properties

Sipina, E.V.; Spassky, D.A.; Krutyak, N.R.; Morozov, V.A.; Zhukovskaya, E.S.; Belik, A.A.; Manylov, M.S.; Lazoryak, B.I.; Deyneko, D.V.

Авторы: Sipina Elena V., Spassky Dmitry A., Krutyak Nataliya R., Morozov Vladimir A., Zhukovskaya Evgenia S., Belik Alexei A., Manylov Mikhail S., Lazoryak Bogdan I., Deyneko Dina V.
Журнал: Materials
Том: 16
Номер: 4
Год издания: 2023
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Номер статьи: 1383
DOI: 10.3390/ma16041383
Аннотация: β-Ca3(PO4)2-type phosphors Ca9−xMnxEu(PO4)7 have been synthesized by high-temperature solid-phase reactions. The crystal structure of Ca8MnEu(PO4)7 was characterized by synchrotron X-ray diffraction. The phase transitions, magnetic and photoluminescence (PL) properties were studied. The abnormal reduction Eu3+ → Eu2+ in air was observed in Ca9−xMnxEu(PO4)7 according to PL spectra study and confirmed by X-ray photoelectron spectroscopy (XPS). Eu3+ shows partial reduction and coexistence of Eu2+/3+ states. It reflects in combination of a broad band from the Eu2+ 4f65d1 → 4f7 transition and a series of sharp lines attributed to 5D0 → 7FJ transitions of Eu3+. Eu2+/Eu3+ ions are redistributed among two crystal sites, M1 and M3, while Mn2+ fully occupies octahedral site M5 in Ca8MnEu(PO4)7. The main emission band was attributed to the 5D0 → 7F2 electric dipole transition of Eu3+ at 395 nm excitation. The abnormal quenching of Eu3+ emission was observed in Ca9−xMnxEu(PO4)7 phosphors with doping of the host by Mn2+ ions. The phenomena of abnormal reduction and quenching were discussed in detail.
Добавил в систему: Дейнеко Дина Валерьевна

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Abnormal Eu3+ - Eu2+ Reduction in Ca9-xMnxEu(PO4)7 Phosphors: Structure and Luminescent Propertiesстатья

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