Energy transfer mechanism from Gd3+ to Sm3+ in K3+Gd(PO4)2:Sm3+ phosphor

Palvi Gupta, A. K. Bedyal, Vinay Kumar, Y. Khajuria, Vishal Sharma, O. M. Ntwaeaborwa, H. C. Swart

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44 Citations (Scopus)


Undoped K3+Gd(PO4)2 and trivalent samarium (0.5-2.5 mol%) doped K3+Gd(PO4)2 phosphors were synthesized by the solid-state method. The phase formation, optical and luminescence properties were investigated by x-ray diffraction (XRD), diffuse reflectance (DR) spectroscopy, and photolumines-cence (PL) spectroscopy. The fluorescence decay spectra of the obtained phosphors were also recorded to study the energy transfer from sensitizer (Gd3+) to activator (Sm3+). Energy transfer effects from sensitizer to activator caused by rare-earth ions were mainly observed in the obtained PL and lifetime spectra. The decay curves of K3+Gd(PO4)2 phosphor with different Sm3+ ions concentrations were found to be non-exponential and the data is well fitted with the Inokuti-Hirayama (I-H) model. The energy transfer parameters such as critical distance for the transfer processes were determined. The Commission Internationale de l'Eclairage (CIE) chromatic coordinates and color-correlated temperature were also determined for the prepared phosphor.

Original languageEnglish
Article number076202
JournalMaterials Research Express
Issue number7
Publication statusPublished - Jul 2015
Externally publishedYes


  • Energy transfer
  • Inokuti-Hirayama model
  • Luminescence
  • Phosphor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Metals and Alloys


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