Improvement of blue, white and NIR emissions in YPO4:Dy3+ nanoparticles on co-doping of Li+ ions.
As-prepared samples of YPO(4):2Dy nanoparticles prepared by polyol route show strong blue luminescence because of strong host contribution, whereas 500 and 900 °C annealed samples show cold and warm white luminescence, respectively because of different energy transfer rates from host to Dy(3+). Li(+) co-doping improves luminescence intensity as well as crystallinity significantly. Interestingly, Li(+) ions occupy interstitial sites of lattice. These materials will be potential candidates for white light emitting diodes and near-infrared emitting phosphors.
Department of Physics, Banaras Hindu University, Varanasi, India.
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AK
Parchur
A I
AI
Prasad
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SB
Rai
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RS
Ningthoujam