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Luminomagnetic K2Gd1−xZr(PO4)3:Tbx3+ phosphor with intense green fluorescence and paramagnetism

Authors

  • Raj Kumar,

    1. CSIR-National Physical Laboratory, Council of Scientific and Industrial Research, New Delhi, India
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    • Present address: Department of Materials for Engineering, University of Brescia, 25138 Brescia, Italy.
  • Ravi Shanker,

    1. CSIR-National Physical Laboratory, Council of Scientific and Industrial Research, New Delhi, India
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    • Present address: Department of Physics, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford GU2 7XH, UK.
  • Ravinder Kumar Kotnala,

    1. CSIR-National Physical Laboratory, Council of Scientific and Industrial Research, New Delhi, India
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  • Santa Chawla

    Corresponding author
    • CSIR-National Physical Laboratory, Council of Scientific and Industrial Research, New Delhi, India
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Corresponding author: e-mail santa@nplindia.org, Phone: 91 11 45609242, Fax: 91 11 45609310

Abstract

Multimetallic complex phosphate K2Gd1−xZr(PO4)3:Tbx3+ (0 ≤ x ≤ 50) synthesized by solid state diffusion exhibit intense green fluorescence and paramagnetic behaviour. Monophasic particles of dimensions ranging from few hundred nanometers to few micrometers could be obtained. Photo excitation at 274 nm corresponding to Gd3+ transition8S7/26IJ and Gd3+–Tb3+ charge transfer followed by emission from 5DJ(J = 3,4) to 7FJ(J = 3,4,5,6) levels of Tb3+ ions is observed to be the most effective photoluminescence mechanism. Paramagnetic nature was proved by VSM study. Variation of paramagnetism in undoped K2GdZr(PO4)3 and K2Gd1−xZr(PO4)3:Tbx3+ particles and quantitative analysis by EPR indicate the role of unpaired 4f electron spin of trivalent rare earth ions in the lattice for making the particles paramagnetic.

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