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Tunable luminescence of Eu 3+ ‐activated CaWO 4 nanophosphors via Bi 3+ incorporation
Author(s) -
Nayak Priyanka,
Nanda Sushri Sangita,
Sharma R.K.,
Dash S.
Publication year - 2020
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.3818
Subject(s) - luminescence , spectroscopy , analytical chemistry (journal) , x ray photoelectron spectroscopy , materials science , ion , ethylene glycol , fourier transform infrared spectroscopy , phosphor , absorption spectroscopy , activator (genetics) , crystallography , chemistry , nuclear magnetic resonance , optics , physics , optoelectronics , organic chemistry , chromatography , quantum mechanics , biochemistry , gene
A series of CaWO 4 :3Eu 3+ : x Bi 3+ ( x = 2, 5, 7 and 10 at.%) nanophosphors was prepared through the efficient low‐temperature ethylene glycol route. Their structural, as well as photophysical, properties were studied. X‐ray diffraction analysis and a X‐ray photoelectron spectroscopy survey confirmed that the Bi 3+ and Eu 3+ ions incorporated perfectly into Ca 2+ and without disturbing the lattice. The samples exhibited almost spherical morphology with average particle sizes from 10 to 30 nm. For the nanoparticles, Fourier transform infrared spectroscopy featured broad absorption bands around 871 and 778 cm −1 that were due to antisymmetric stretching, whereas a peak at 435 cm −1 was assigned to antisymmetric bending vibrations of the bonds in [WO 4 2− ] clusters. The nanophosphors showed orange‐red luminescence, which was further tuned to red by incorporation of sensitizer Bi 3+ ions. This colour tuning of the nanoparticles is described in the context of energy transfer from the WO 4 2− group to sensitizer Bi 3+ and activator Eu 3+ ions under 394 nm excitation. A CIE diagram supports this colour tunability.