Luminescent properties of Sr4V2O9:Eu3+,Ba2+ phosphors prepared by a solvothermal method

• A new type of luminescent materials Sr4V2O9 using solvothermal method is prepared.
• The SEM result shows that Sr4V2O9:Eu,Ba is composed of nano-rods and forms a flower-like structure.
• The emission intensity is enhanced with Eu3+ and Ba2+ doping.
• The quenching effect between Eu and Ba is also observed.

Eu3+ and Ba2+ co-doped Sr4V2O9 samples are prepared via a hydrothermal method and the structure, morphology, and photoluminescence properties are investigated. Sr4V2O9 is composed of disperse nano-rods. However, with Eu3+ and Ba2+ co-doping, nano-rods begin agglomerated and extend outward from the center to form a flower-like structure. Photoluminescence measurement indicates that Ba2+ dopants greatly enhance the emission intensity, for example, the enhanced emission intensity reaches for 234% when Ba2+ content is 5% for Sr4V2O9:Eu3+ (10%),Ba2+ (x%). However, with Ba2+ increasing further, the emission intensity decreases for Sr4V2O9:Eu3+ (10%),Ba2+ (x%) and Sr4V2O9:Eu3+(15%),Ba2+ (x%) samples, which is ascribed to the quenching behaviors. Further, CIE coordinates of (0.666, 0.333) for Sr4V2O9:Eu3+ (15%),Ba2+ (8%) sample, very similar to the (0.665, 0.334) coordinates for the commercial red phosphor Y2O3S:Eu3+, can be obtained.

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