Radiative properties of ‘intense’ red emitting LiAl5O8:Eu phosphors

  • M. Mohapatra
  • M. Seshadri
  • Y. P. Naik
  • G. Meena
  • R. M. Kadam
  • Vijay Singh
Article
  • 27 Downloads

Abstract

LiAl5O8 doped with varying concentrations of Eu were synthesized by a solid state reaction route. Phase purity of the prepared phosphors was determined using X-ray diffraction technique. Dynamic light scattering technique was used to estimate the average particle size of the synthesized products that was found to be ~ 110 nm. The doped phosphor samples exhibited strong excitation band in the range 210–290 nm with 613 nm emission suggesting the stabilisation of trivalent Eu. With 394 nm (UV) excitation, strong visible luminescence was observed at 613 nm corresponding to the 5D0 → 7F2 transition of the Eu3+ ions. The emission parameters were optimised by varying the dopant ion concentration and annealing temperature. The intensity parameters (Ωλ, λ = 2, 4 and 6), radiative transition probabilities (A R ), radiative lifetime (τ R ) and branching ratios (β) for the system were evaluated in the framework of the model given by Judd–Ofelt. The CIE coordinates for the system were evaluated by adopting standard procedure, which suggested that the system has enough potential to be used as a red phosphor.

Supplementary material

10854_2018_8775_MOESM1_ESM.docx (201 kb)
Supplementary material 1 (DOCX 201 KB)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • M. Mohapatra
    • 1
  • M. Seshadri
    • 2
  • Y. P. Naik
    • 3
  • G. Meena
    • 1
  • R. M. Kadam
    • 1
  • Vijay Singh
    • 4
  1. 1.Radiochemistry DivisionBhabha Atomic Research CentreMumbaiIndia
  2. 2.Department of PhysicsFederal University of Juiz de ForaJuiz de ForaBrazil
  3. 3.Product Development SectionBhabha Atomic Research CentreMumbaiIndia
  4. 4.Department of Chemical EngineeringKonkuk UniversitySeoulRepublic of Korea

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