Investigation of structural and luminescent properties of Pr3+ activated CsGd(WO4)2 by sol–gel synthesis

• Prx3+:CsGd1−x(WO4)2 crystalline powders were synthesized by sol–gel process.
• FE-SEM confirms the nano sheet like morphology for powders calcined at 700 °C.
• Raman bands reveal molecular vibrational modes of the tungsten–oxygen chains.
• Red emission was observed at 610 nm on excitation at 450 nm.

Prx3+:CsGd(1−x)(WO4)2 (0 ≤ x ≤ 0.06) red phosphor was synthesized by the polymeric complex sol–gel method. Prx3+:CsGd(1−x)(WO4)2 samples belong to the P21/m monoclinic system, which was confirmed by powder X-ray diffraction. The Raman bands reveal intense tungstate related vibrations in the high-frequency region. The effect of the calcination temperature on the morphology of the samples was analyzed using FE-SEM micrographs. The excitation spectrum of Prx3+:CsGd(1−x)(WO4)2 phosphor shows a charge transfer (WO) band within the WO42− group. The emission spectrum shows an intense red emission at 610 nm at the excitation wavelength of λex = 450 nm The emission bands due to the intraconfigurational 4f → 4f transitions, originating from the 3P0 multiplets of the Pr3+ ions were identified.

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