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Erschienen in:
02.08.2020
Novel red-emitting BaGeTeO6:Sm3+ phosphors with high color purity for NUV excited with white LEDs
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 17/2020
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Abstract
Sm3+ ions activated BaGeTeO6 phosphors were firstly produced through a method of solid-state synthesis at high temperatures. X-ray diffraction pointed out the pure phase of BaGeTeO6 phosphors. Photoluminescence spectrum of BaGeTeO6:Sm3+ phosphor showed the strong red emission at 647 nm under 404 nm excitation, while the associated absorption peaks were in the near-ultraviolet area. The optimal doped concentration of BaGeTeO6:Sm3+ phosphor was found at 10 mol%. The Commission Internationale de L'Eclairage coordinates of BaGeTeO6:0.10Sm3+ were calculated to be (0.624, 0.375) and the color purity as high as 99.8%. White light-emitting diodes have been fabricated based on the InGaN chip with high color rendering index (CRI, Ra = 90) and good correlated color temperature (CCT = 5396 K). Therefore, Sm3+-doped BaGeTeO6 phosphors have potential application in the illumination field.