Luminomagnetic K2Gd1−xZr(PO4)3:Tbx3+ phosphor with intense green fluorescence and paramagnetism. Issue 9 (1st July 2013)

• Record Type: Journal Article
• Authors: Kumar, Raj; Shanker, Ravi; Kotnala, Ravinder Kumar; Chawla, Santa
• Is Part Of: Physica status solidi. Volume 210:Issue 9(2013:Sep.)
• Page Start: 1933
• Page End: 1937
• Publication Date: 2013-07-01
• Subjects: Solid state physics -- Periodicals; Solids -- Industrial applications -- Periodicals; 530.41
• DOI: 10.1002/pssa.201329087
• Languages: English
• ISSNs: 1862-6300

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="pssa201329087-sec-0001" sec-type="section"> <p>Multimetallic complex phosphate K₂Gd_{1−<italic>x</italic>}Zr(PO₄)₃:Tb_{<italic>x</italic>}³⁺ (0 ≤ <italic>x</italic> ≤ 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⁺ transition⁸S_7/2–⁶I_{<italic>J</italic>} and Gd³⁺–Tb³⁺ charge transfer followed by emission from ⁵D_{<italic>J</italic>(<italic>J</italic> = 3, 4)} to ⁷F_{<italic>J</italic>(<italic>J</italic> = 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 K₂Gd_{1−<italic>x</italic>}Zr(PO₄)₃:Tb_{<italic>x</italic>}³⁺ 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.</p> </sec> </abstract>