In-air self-reduction synthesis and luminescence properties from Mg21 Ca4 Na4 (PO4 )18 :Eu2+ -Eu3+ excited using ultraviolet light

Abstract

A series of Mg₂₁ Ca₄ Na₄ (PO₄ )₁₈ :Eu²⁺ -Eu³⁺ phosphors was successfully synthesized using a high-temperature solid-state method in an air atmosphere. The phase structures and luminescence properties of the samples were studied in detail. The phosphors exhibited strong visible light emission under different wavelengths of ultraviolet light excitation. By harmonizing the doping concentration of Eu³⁺ to adjust the relative luminescence intensity of Eu²⁺ and Eu³⁺ , a colourful emission of phosphors could be achieved. In addition, the colour coordinates of the International Commission on lighting indicated that Mg₂₁ Ca₄ Na₄ (PO)₁₈ :Eu²⁺ -Eu³⁺ could be considered as a potential blue, orange and red phosphor for white light-emitting diode applications.

Keywords: Mg21Ca4Na4(PO4)18:Eu2+-Eu3+; phosphate phosphor; self-reduction.