Luminescence properties of Sm{sup 3+} doped YPO{sub 4}: Effect of solvent, heat-treatment, Ca{sup 2+}/W{sup 6+}-co-doping and its hyperthermia application
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085 (India)
Sm{sup 3+} doped YPO{sub 4} spherical nanoparticles are prepared by wet chemical route. Pure YPO{sub 4} shows the tetragonal phase, which is stable up to 900 °C, whereas pure SmPO{sub 4} shows the phase transition from hexagonal to monoclinic when heated above 800 °C. The (2-10 at.%) Sm{sup 3+} doped YPO{sub 4} shows the mixture of phases of tetragonal and hexagonal, which transform to the tetragonal phase above 800 °C. Infra-red study could distinguish confined water in the pore of hexagonal phase from water present on the surface of particles. Luminescence intensities of Sm{sup 3+} at 564, 601 and 645 nm are weak in case of as-prepared samples because of high non-radiative rate arising from the H{sub 2}O molecules present in pores of hexagonal lattice. The intensities increase for samples heated up to 900 °C because of increase of extent of radiative rate. Luminescence lifetime increases with increase of heat-treatment up to 900 °C. When solvent of as-prepared sample was changed from the H{sub 2}O to D{sub 2}O, 5 times enhancement in luminescence intensity is observed, which can be ascribed to the lower vibration energy of D-O over H-O, which is near to Sm{sup 3+}. When Y{sup 3+} and P{sup 5+} ions are substituted by Ca{sup 3+} and W{sup 3+} up to 3 at.%, there is an enhancement of luminescence. In order to use them as bio-labeling in drug delivery for hyperthermia applications, hybrid of Fe{sub 3}O{sub 4}@YPO{sub 4}:7Sm is prepared and heating up to 45 °C is observed under AC magnetic field.
- OSTI ID:
- 22611481
- Journal Information:
- AIP Advances, Vol. 2, Issue 4; Other Information: (c) 2012 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 2158-3226
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CALCIUM ADDITIONS
DOPED MATERIALS
FERRITES
HEAT TREATMENTS
HEAVY WATER
HEXAGONAL LATTICES
HYPERTHERMIA
IRON OXIDES
LUMINESCENCE
MAGNETIC FIELDS
MONOCLINIC LATTICES
NANOPARTICLES
PHASE TRANSFORMATIONS
PHOSPHORUS IONS
SAMARIUM ADDITIONS
TUNGSTEN ADDITIONS
YTTRIUM IONS
YTTRIUM PHOSPHATES