Effect of Oxygen Vacancies on the Persistent Luminescence of Y3Al2Ga3O12:Ce3+,Yb3+ Phosphors.
Inorg Chem
; 60(23): 17797-17809, 2021 Dec 06.
Article
em En
| MEDLINE
| ID: mdl-34806868
ABSTRACT
The effect of oxygen vacancies (VO) and the atmosphere influence on persistent luminescence (PersL) in Y3Al2Ga3O12 (YAGG)Ce3+,Yb3+ are investigated by heating it in CO2, air, and 10% H2/90% Ar atmospheres. The VO-rich YAGG phosphors with outstanding PersL are successfully obtained by the common contribution of the reducing atmosphere and the incorporated Yb3+ ions, and the concentration of oxygen vacancies in the phosphors is characterized by X-ray photoelectron spectroscopy and electron paramagnetic resonance measurements. Compared to the best sample prepared in neutral CO2, the reduced sample shows an increase of 30% in initial intensity and 100% in duration time, while the oxidized sample decreases drastically and shows a faint and undetectable PersL. The enhancement is mainly caused by the abundant formation of VO, which is achieved by the pairing of VO with Yb2+ ions. The newly created VO by the reducing calcination is inferred to be adjacent to the Yb site and forms a compensation-type defect cluster due to the charge compensation effect. These findings reveal that understanding the effect and formation of VO is of great significance to design a high-performance phosphor.
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MEDLINE
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2021
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Article