Eu3+-activated SrMoO4 phosphors for white LEDs applications: Synthesis and structural characterization
Data(s) |
2015
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Resumo |
We report the synthesis of Eu3+-activated SrMoO4 phosphors by the facile nitrate-citrate gel combustion method. Powder XRD and Rietveld refinement data confirmed that these phosphors have a monophasic scheelite-type tetragonal structure with space group I4(1)/a (No. 88). FESEM micrographs indicate the agglomerated spherical particles. FTIR spectra showed four stretching and bending vibrational modes (2A(u) and 2E(u)). UV-Visible absorption spectroscopy illustrated that the optical band gap energy (E-g) values increase with increase in Eu3+ concentration. The host SrMoO4 phosphor exhibited an intense blue emission under UV excitation (368 nm). The Eu3+-activated SrMoO4 phosphors revealed characteristic luminescence due to Eu3+ ion corresponding to D-5(1) -> F-7(J) (J = 1,2) and D-5(0) -> F-7(J) (J = 1,2,3,4) transitions upon 465 nm excitation. The electric dipole transition located at 615 nm (D-5(0) -> F-7(2)) was stronger than the magnetic dipole transition located at 592 nm (D-5(0) -> F-7(1)). Intensity parameters (Omega(2), Omega(4)) and radiative properties such as transition probabilities (A(T)), radiative lifetime (tau(rad)) and branching ratio (beta) of Eu3+-activated SrMoO4 phosphors were calculated using the Judd-Ofelt theory. Based on the CIE chromaticity diagram, these phosphors can be promising materials for the development of blue and orange-red component in white LEDs. (C) 2015 Elsevier B.V. All rights reserved. |
Formato |
application/pdf |
Identificador |
http://eprints.iisc.ernet.in/51429/1/opt_mat-42_178_2015.pdf Shivakumara, C and Saraf, Rohit (2015) Eu3+-activated SrMoO4 phosphors for white LEDs applications: Synthesis and structural characterization. In: OPTICAL MATERIALS, 42 . pp. 178-186. |
Publicador |
ELSEVIER SCIENCE BV |
Relação |
http://dx.doi.org/10.1016/j.optmat.2015.01.006 http://eprints.iisc.ernet.in/51429/ |
Palavras-Chave | #Solid State & Structural Chemistry Unit |
Tipo |
Journal Article PeerReviewed |