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- Title
Blue-green luminescence properties and charge compensation of Ca<sub>9</sub>MgLi(PO<sub>4</sub>)<sub>7</sub> doped with Tb<sup>3+</sup> and alkali metal ions.
- Authors
Zhang, Qili; Lou, Ruting; Liu, Zheng; Feng, Wenlin
- Abstract
Ca9MgLi(PO4)7: 4%Tb3+, 4%R+ (R = Li, Na, K) phosphors were synthesized by a solid-state reaction method. The crystal structure, morphology, composition and luminescent properties of as-prepared samples were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), energy dispersive spectrometer (EDS), high-angle annular dark field (HAADF) and spectroscopy technique. The effect of a small concentration of charge compensators like Li+, Na+, K+ on Ca9MgLi(PO4)7: Tb3+ phosphor has also investigated. Ca9MgLi(PO4)7: Tb3+, R+ (R = Li, Na, K) exhibit superior blue-green luminescence around 5D4 → 7F5 (543 nm) to Ca9MgLi(PO4)7: Tb3+ and can be effectively excited by 370 nm light, which implies that efficient charge compensation can promote the emitting of Tb3+ in Ca9MgLi(PO4)7. The CIE coordinates and decay lifetimes of typical samples were also studied. The Ca9MgLi(PO4)7: Tb3+, R+ (R = Li, Na, K) have promising application as a blue-green phosphor for near-ultraviolet chip excited white LEDs.
- Subjects
TERBIUM; ALKALI metal ions; LUMINESCENCE; TRANSMISSION electron microscopy; X-ray diffraction; PHOSPHORS
- Publication
Zeitschrift für Naturforschung Section A: A Journal of Physical Sciences, 2023, Vol 78, Issue 3, p263
- ISSN
0932-0784
- Publication type
Article
- DOI
10.1515/zna-2022-0208