Synthesis of Eu3+-activated BaMoO4 phosphors and their Judd–Ofelt analysis: Applications in lasers and white LEDs

• BaMoO4: Eu3+ phosphors were synthesized using nitrate–citrate gel combustion method.
• Host BaMoO4 phosphor revealed white emission upon excitation at 370 nm.
• Eu3+-activated BaMoO4 exhibited red luminescence which was confirmed by CIE chromaticity diagram.
• Judd–Ofelt parameters and other radiative properties of Eu3+-activated BaMoO4 have been determined.
• These phosphors can be used in red lasers and optical display devices.

Eu3+-activated BaMoO4 phosphors were synthesized by the nitrate–citrate gel combustion method. The Rietveld refinement analysis confirmed that all the compounds were crystallized in the scheelite-type tetragonal structure with I41/a (No. 88) space group. Photoluminescence (PL) spectra of BaMoO4 phosphor reveals broad emission peaks at 465 and 605 nm, whereas the Eu3+-activated BaMoO4 phosphors show intense 615 nm (5D0 → 7F2) emission peak. Judd–Ofelt theory was applied to evaluate the intensity parameters (Ω2, Ω4) of Eu3+-activated BaMoO4 phosphors. The transition probabilities (AT), radiative lifetime (τrad), branching ratio (β), stimulated emission cross-section (σe), gain bandwidth (σe × Δλeff) and optical gain (σe × τrad) were investigated by using the intensity parameters. CIE color coordinates confirmed that the BaMoO4 and Eu3+-activated BaMoO4 phosphors exhibit white and red luminescence, respectively. The obtained results revealed that the present phosphors can be a potential candidate for red lasers and white LEDs applications.

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