Effect of photoluminescence property in Li+, Ca2+, Bi3+ ions co-doped SrMoO4:Eu3+ phosphors and their Judd–Ofelt analysis for solid-state lighting applications

Ranganatha, CL and Palakshamurthy, BS and Abhilash, GP and Halappa, P and Shivakumara, C (2023) Effect of photoluminescence property in Li+, Ca2+, Bi3+ ions co-doped SrMoO4:Eu3+ phosphors and their Judd–Ofelt analysis for solid-state lighting applications. In: Journal of Materials Science: Materials in Electronics, 34 (7).

PDF jou_mat_sci_34-7_2023.pdf - Published Version Restricted to Registered users only Download (2MB) | Request a copy

Abstract

Series of monovalent (Li+, Na+, K+), divalent (Ca2+) and trivalent (Bi3+) ions co-doped with SrMoO4: Eu3+ phosphors were synthesized by the conventional solid-state method. Rietveld refinement of XRD data reveals that the phosphors were crystallized in the scheelite type tetragonal structure with space group I41/a. On substitution of Eu3+ ion to Sr2+-site in SrMoO4 host lattice, the photoluminescence spectra exhibit characteristic emission 5D0 → 7FJ (J = 0–4) intra-4f shell of Eu3+ ion transitions. PL spectra reveal that the observed electric dipole transition (5D0 → 7F2, 616 nm) is more intense than the magnetic dipole transition (5D0 → 7F1, 592 nm). Further, an enhanced the luminescent intensity by co-doping with the same cation charge with different ionic radii (Li+, Na+, K+) and different cation charges, as well as ionic radii (Li+, Ca2+, Bi3+) in Eu3+, activated SrMoO4 host lattice. PL spectra reveals that, Li+ ion co-doped phosphors exhibit 1.5 times more intense than SrMoO4: Eu3+ phosphor due to the distorted nature of the local symmetry and charge compensation between dopant Eu3+ and co-dopant Li+ ions. The evaluated CIE 1931 color co-ordinates for Sr0.14Eu0.11Li0.05MoO4 (0.648, 0.349) is very close to the commercial Y2O3:Eu3+ (0.645, 0.347) and Y2O2S: Eu3+ (0.647, 0.343) red phosphors. The determined Judd–Ofelt analysis and radiative properties suggest that the present phosphors have a long lifetime (0.527 ms), excellent color purity (92%), and a lower CCT value (2273 K). Hence, these classes of compounds are potential materials for the red component in developing white light-emitting diodes.

Item Type:	Journal Article
Publication:	Journal of Materials Science: Materials in Electronics
Publisher:	Springer
Additional Information:	The copyright for this article belongs to Springer.
Keywords:	Europium compounds; Lighting; Lithium compounds; Phosphors; Photoluminescence; Positive ions; Rietveld refinement; Tungstate minerals, Ca 2+; Cation charge; Co-doped; Host lattice; Ionic radius; Judd-ofelt analysis; Li +; Photoluminescence properties; PL spectra; Solid-state lighting application, Strontium compounds
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	15 Mar 2023 09:21
Last Modified:	15 Mar 2023 09:21
URI:	https://eprints.iisc.ac.in/id/eprint/80975

Actions (login required)

View Item