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BiPO4: a better host for doping lanthanide ions.

Boddu Sanyasi Naidu1, Bathula Vishwanadh, Vasanthakumaran Sudarsan

  • 1Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India.

Dalton Transactions (Cambridge, England : 2003)
|January 31, 2012
PubMed
Summary

Bismuth phosphate (BiPO4) offers a superior alternative to lanthanide phosphate hosts for luminescent materials. This research details its synthesis and demonstrates efficient energy transfer from BiPO4 to lanthanide ions.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Solid-State Chemistry

Background:

  • Lanthanide-based luminescent materials are crucial for various applications.
  • Current lanthanide phosphate hosts face limitations in availability and cost.
  • There is a growing demand for alternative host materials based on abundant main group elements.

Purpose of the Study:

  • To investigate bismuth phosphate (BiPO4) as a novel host for lanthanide ion-based luminescent materials.
  • To explore the synthesis and structural properties of hexagonal and monoclinic BiPO4 phases.
  • To evaluate the luminescent properties and energy transfer mechanisms in BiPO4:Ln samples.

Main Methods:

  • Synthesis of hexagonal and monoclinic BiPO4 via reactions in ethylene glycol at different temperatures.
  • Differential Thermal Analysis (DTA) to study phase formation mechanisms.
  • X-ray Diffraction (XRD), Fourier-Transform Infrared Spectroscopy (FTIR), and 31P solid-state Nuclear Magnetic Resonance (NMR) for structural characterization.
  • Photoluminescence spectroscopy to study host-to-dopant energy transfer.

Main Results:

  • Hexagonal and monoclinic BiPO4 phases were successfully synthesized at 100 °C and 185 °C, respectively.
  • Differential Thermal Analysis (DTA) indicated nucleation mechanism differences, not phase transitions, govern monoclinic BiPO4 formation at lower temperatures.
  • Monoclinic BiPO4 formed stable solid solutions with both monazite (monoclinic) and xenotime (tetragonal) lanthanide phosphates.
  • Efficient energy transfer from Bi3+ (host) to Ln3+ (dopant) ions was observed upon excitation of the Bi3+ (1S0→3P1) transition.

Conclusions:

  • Bismuth phosphate (BiPO4) is a promising and cost-effective alternative host material for lanthanide-based luminescent applications.
  • The synthesis of distinct BiPO4 phases and their ability to form solid solutions with lanthanide phosphates are key advantages.
  • The demonstrated host-to-dopant energy transfer mechanism highlights the potential of BiPO4 for developing advanced luminescent materials.