CHEM01200604004 Shri Sanyasinaidu Boddu - Homi Bhabha ...

This chapter is divided into three sections. The first section deals with structural and
luminescence properties of GaPO nanoparticles having different concentration of Eu 3+
4 ions.
The results obtained from this study is used to understand the luminescence properties of
3+ 3+ 3+
other lanthanide ions (Tb , Dy , Er , etc.) doped nanoparticles. The second section
describes synthesis and optical properties of lanthanide doped SbPO 4 nanomaterials.
Incorporation of lanthanide ions in such low symmetry environments (coordination number
4) and their luminescence properties are discussed. Vibrational spectroscopy has been used to
confirm incorporation of lanthanides ions in the SbPO 4 host. Changes in the experimental
conditions like synthesis temperature, doping concentration and varying the relative volume
of solvent, etc., on the vibrational and luminescence properties from such nanomaterials are
investigated. Luminescence properties of these nanomaterials are compared with the
lanthanide ions doped bulk materials obtained by solid-state reaction. Energy transfer
between Ce 3+ and Tb 3+ ions and its effect on the decay profiles of the excited state of Tb 3+
ions in SbPO 4 host is also discussed in this section. In the third section synthesis and
characterization of lanthanide doped BiPO 4 nanomaterials is discussed in detail. Lanthanide
ions doped BiPO 4 nanomaterials with different crystal structures have been prepared at a
relatively low temperatures and the effect of crystal structure on luminescence properties of
the lanthanide ions is also investigated.
4.2. Studies on GaPO 4 and lanthanide ions containing GaPO nanomaterials: GaPO
4 4
nanoparticles were prepared at 140 o C in glycerol by precipitating Ga 3+ with ammonium
dihydrogen phosphate. For europium containing samples, appropriate concentration of Eu 3+ is
also used along with Ga 3+ ions.
4.2.1. XRD, FT-IR and TEM study: XRD patterns of GaPO 4 nanoparticles containing 0,
2.5 and 5 at % Eu 3+ ions are shown Fig.54. For the purpose of comparison XRD pattern of a
standard hexagonal GaPO (JCPDS file no. 080497) is also included in this figure. The
4
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