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

C Shivakumara; Rohit Saraf; Sukanti Behera; N Dhananjaya; H Nagabhushana

doi:10.1016/j.saa.2015.06.045

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

Spectrochim Acta A Mol Biomol Spectrosc. 2015 Dec 5:151:141-8. doi: 10.1016/j.saa.2015.06.045. Epub 2015 Jun 19.

Authors

C Shivakumara¹, Rohit Saraf², Sukanti Behera², N Dhananjaya³, H Nagabhushana⁴

Affiliations

¹ Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India. Electronic address: shiva@sscu.iisc.ernet.in.
² Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India.
³ Department of Physics, B.M.S. Institute of Technology, Bangalore 560 064, India.
⁴ C.N.R. Rao Center for Advanced Materials, Tumkur University, Tumkur 572 103, India.

PMID: 26135534
DOI: 10.1016/j.saa.2015.06.045

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.

Keywords: Eu(3+); Judd–Ofelt analysis; Lasers; Nitrate–citrate gel combustion; Phosphors.