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Erschienen in:
25.10.2017
Single phased Sr3La(PO4)3:Eu2+/Mn2+ phosphors: solid state synthesis, tunable luminescence and potential applications in white light LEDs
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 3/2018
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Abstract
A series of Sr3La(PO4)3:Eu2+/Mn2+ phosphors were synthesized by a solid state reaction. The phase and the optical properties of the synthesized phosphors were investigated. The XRD results indicate that the doped Eu2+ and Mn2+ ions do not change the phase of Sr3La(PO4)3. The peak wavelengths of Eu2+ single doped and Eu2+/Mn2+ codoped Sr3La(PO4)3 phosphors shift to longer wavelength due to the larger crystal field splitting for Eu2+ and Mn2+. The increases of crystal field splitting for Eu2+ and Mn2+ are induced by the substitution of Sr2+ by Eu2+ and Mn2+ in Sr3La(PO4)3 host. Due to energy transfer from Eu2+ to Mn2+ in Sr3La(PO4)3:Eu2+/Mn2+ phosphors, tunable luminescence was obtained by changing the concentration of Mn2+. And the white light was emitted by Sr3La(PO4)3:3.0 mol%Eu2+/4.0 mol%Mn2+ and Sr3La(PO4)3:3.0 mol%Eu2+/5.0 mol%Mn2+ phosphors.