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Luminomagnetic K 2 G d 1− x Z r( PO 4 ) 3 : T b x 3+ phosphor with intense green fluorescence and paramagnetism
Author(s) -
Kumar Raj,
Shanker Ravi,
Kotnala Ravinder Kumar,
Chawla Santa
Publication year - 2013
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201329087
Subject(s) - paramagnetism , electron paramagnetic resonance , phosphor , photoluminescence , ion , analytical chemistry (journal) , materials science , crystallography , chemistry , nuclear magnetic resonance , physics , condensed matter physics , optoelectronics , organic chemistry , chromatography
Multimetallic complex phosphate K 2 Gd 1− x Zr(PO 4 ) 3 :Tb x 3+ (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 Gd 3+ transition 8 S 7/2 – 6 I J and Gd 3+ –Tb 3+ charge transfer followed by emission from 5 D J ( J = 3,4) to 7 F J ( J = 3,4,5,6) levels of Tb 3+ ions is observed to be the most effective photoluminescence mechanism. Paramagnetic nature was proved by VSM study. Variation of paramagnetism in undoped K 2 GdZr(PO 4 ) 3 and K 2 Gd 1− x Zr(PO 4 ) 3 :Tb x 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.