Details

Autor(en) / Beteiligte

• Glorieux, B.
• Jubera, V.
• Orlova, A. I.
• Kanunov, A. E.
• Garcia, A.
• Pallier, C.
• Oleneva, T. A.

Titel

Phosphors based on NaZr2(PO4)3-type calcium and strontium phosphates activated with Eu2+ and Sm3

Ist Teil von

• Inorganic materials, 2013, Vol.49 (1), p.82-88

Ort / Verlag

Dordrecht: SP MAIK Nauka/Interperiodica

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Ca 0.5 Zr 2 (PO 4 ) 3 :Eu 2+ , Sr 0.5 Zr 2 (PO 4 ) 3 :Eu 2+ , and Ca 0.5 Zr 2 (PO 4 ) 3 :Eu 2+ , Sm 3+ orthophosphates prepared through precipitation using sol-gel processes are analogs of NaZr 2 (PO 4 ) 3 (NZP) and crystallize in space group R . Their crystallographic parameters determined by X-ray diffraction are consistent with the interatomic distances extracted from EXAFS data. Their luminescence spectra obtained under excitation in the range 300–400 nm contain emission bands between 425 and 525 nm. Substitution of the larger sized cations Eu 2+ and Sm 3+ for Ca 2+ shifts the emission bands to shorter wavelengths and reduces their width because of the decrease in the effect of the crystal field. Analysis of the spectra indicates that Eu 2+ occupies two types of crystallographic sites (independent interstitial sites of different sizes and shapes in the NZP framework structure). Codoping with Eu and Sm has ensured luminescence with chromaticity coordinates approaching those of white light: ( x = 0.27, y = 0.34).