title: Synthesis of Eu³⁺-activated BaMoO₄ phosphors and their Judd-Ofelt analysis: Applications in lasers and white LEDs.
abstract: Eu(3+)-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 Eu(3+)-activated BaMoO4 phosphors show intense 615 nm ((5)D0→(7)F2) emission peak. Judd-Ofelt theory was applied to evaluate the intensity parameters (Ω2, Ω4) of Eu(3+)-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 Eu(3+)-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.
authors.affiliation: Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India. Electronic address: shiva@sscu.iisc.ernet.in.
authors.forename: C
authors.initials: C
authors.lastname: Shivakumara
authors.affiliation: Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India.
authors.forename: Rohit
authors.initials: R
authors.lastname: Saraf
authors.affiliation: Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India.
authors.forename: Sukanti
authors.initials: S
authors.lastname: Behera
authors.affiliation: Department of Physics, B.M.S. Institute of Technology, Bangalore 560 064, India.
authors.forename: N
authors.initials: N
authors.lastname: Dhananjaya
authors.affiliation: C.N.R. Rao Center for Advanced Materials, Tumkur University, Tumkur 572 103, India.
authors.forename: H
authors.initials: H
authors.lastname: Nagabhushana
keywords: Eu(3+); Judd–Ofelt analysis; Lasers; Nitrate–citrate gel combustion; Phosphors