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Erschienen in:
01.12.2013
Luminescence and structural properties of Eu3+ doped BaY2ZnO5 for LED solid-state lighting application
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 12/2013
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Abstract
Eu3+ doped BaY2(1−x)ZnO5 phosphor was successfully synthesized by a single step solution combustion process. The crystal structure and particle morphology were investigated by X-ray diffraction (XRD), scanning electron microscopy and transmission electron microscopy. The XRD results suggest that BaY2ZnO5 crystallizes in a single phased orthorhombic structure with space group Pbnm at 1,100 °C. The phosphor can be effectively excited by near-UV light, emitting intense red luminescence (628 nm) corresponding to the hypersensitive 5D0 → 7F2 transition of Eu3+ ions, located at low-symmetry site with no inversion center in BaY2ZnO5 crystal lattice. Fluorescence decay analysis was carried out to understand the energy transfer mechanism and quenching behavior of luminescence of Eu3+ ions in the BaY2ZnO5 phosphor. The BaY2ZnO5: Eu3+ emission (λex = 395 nm) could be tuned from blue to white and red light by varying the Eu3+ ions concentration, making this phosphor as a promising candidate for LEDs application.