Luminescence and thermal-quenching properties of Dy3+-doped Ba2CaWO6 phosphors

• A new double perovskite tungstate Ba2CaWO6:Dy3+ phosphor has been synthesized.
• Their structures, luminescent properties have also been investigated.
• It exhibits blue (493 nm) and yellow (584 nm) emission peaks.
• The thermal-quenching property for Ba2CaWO6:0.05Dy3+ has been firstly evaluated.

A series of new double perovskite tungstate Ba2CaWO6:xDy3+ (0.01 ⩽ x ⩽ 0.15) phosphors were synthesized via solid state reaction process. XRD analysis confirmed the phase formation of Ba2CaWO6:Dy3+ materials. The photoluminescence excitation and emission spectra, concentration effect, thermal-quenching, and decay property were investigated. The phosphor could be excited by the UV light region from 250 to 400 nm, and it exhibits blue (493 nm) and yellow (584 nm) emission corresponding to 4F9/2–6H15/2 transitions and 4F9/2–6H13/2 transitions, respectively. The optimum dopant concentration of Dy3+ ions in Ba2CaWO6:xDy3+ is around 5 mol% and the critical transfer distance of Dy3+ is calculated as 14 Å. The thermal-quenching temperature is 436 K for Ba2CaWO6:0.05Dy3+. The fluorescence lifetime is also determined in Ba2CaWO6:0.05Dy3+.

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