CHEM01200604004 Shri Sanyasinaidu Boddu - Homi Bhabha ...

nm) is observed from Er 3+
doped Ga 2 O 3 nanomaterials. These materials have potential
applications in fabrication of optoelectronic devices and optical amplifiers.
Orthorhombic Sb 2 O 3 nanorods were prepared at room temperature. A distinct
photoluminescence band is observed over the region of 500–600 nm for Sb 2 O 3 nanorods and
has been attributed to the morphology of Sb 2 O 3 nanorods. Changes occurring in the Sb 3+ –O–
Sb 3+ stretching and bending modes of vibration in the Raman spectrum at ~260 and 445 cm -1
further confirm their shape selective nature. Lanthanide ions like Eu 3+ if present during the
room temperature synthesis of Sb 2 O 3 nanorods, leads to its interaction with Sb 3+ ions to
form amorphous europium antimony hydroxide. The amorphous compound on heating at
high temperatures leads to decomposition, giving Eu 2 O 3 and hydrated Sb(V) oxides as major
phases.
Hexagonal GaPO 4 nanoparticles were prepared at a relatively low temperature of
130°C in glycerol medium. Based on the 31 P MAS NMR studies on undoped and lanthanide
doped GaPO 4 it is concluded that upto 2.5 at % Eu 3+ , protons of the surface Ga-OH linkages
are replaced by Eu 3+ ions and beyond which a separate EuPO 4 phase is formed along with
GaPO 4 nanoparticles.
Nanoparticles and nanoribbons of lanthanide ions doped SbPO 4 were prepared at a
low temperature of 120°C in mediums like ethylene glycol and glycerol. Morphology has
been found to vary with the relative concentration of the solvents used for preparation of the
sample. Based on the detailed infrared and Raman studies it has been confirmed that
lanthanide ions are replacing Sb 3+ ions from the SbPO 4 lattice. Energy transfer from Ce 3+ to
Tb 3+ has been observed from Ce 3+ co-doped SbPO 4 :Tb nanomaterials. The efficiency of
energy transfer is around 60% in both SbPO 4 :Ce 3+ (2.5%),Tb 3+ (5%) nanomaterials and
SbPO 4 :Ce 3+ (2.5%),Tb 3+ (5%) incorporated in silica (SbPO 4 :Ce 3+ (2.5%),Tb 3+ (5%)-SiO 2 ).
However, incorporating these nanomaterials into silica matrix leads to the effective shielding
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