Bright UV-C phosphors with excellent thermal stability - Y1-xScxPO4 solid solutions

Авторы: Spassky D., Vasilev A.N., Nagirnyi V., Kudryavtseva I., Deyneko D., Nikiforov I., Kondratyev I., Zadneprovski B.
Журнал: Materials
Том: 15
Год издания: 2022
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Номер статьи: 6844
DOI: 10.3390/ma15196844
Аннотация: Structural and luminescence properties of undoped Y1-xScxPO4 solid solutions have been studied. An intense thermally stable emission with fast decay (τ1/e ~ 10-7 s) and band position varying from 5.21 to 5.94 eV depending on the Sc/Y ratio is detected and ascribed to the 2p O – 3d Sc self-trapped excitons. The quantum yield of the UV-C emission, also depending on the Sc/Y ratio, reaches 30% for the solid solution with x = 0.5 at 300 K. It is shown by combined analysis of theoretical and experimental data that the formation of Sc clusters occurs in the solid solutions studied. The clusters facilitate the creation of energy wells at the conduction band bottom, which enable deep localization of electronic excitations and creation of luminescence centers characterized by high quantum yield and thermal stability of the UV-C emission.
Добавил в систему: Спасский Дмитрий Андреевич

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