Effect of Sr2+ Substitution for Equivalent Ca2+ Ions on Luminescence Intensity of CaTiO3:0.002Pr3+

Abstract

Abstract: Red phosphors (Ca_1-xSr_x)TiO₃:0.002Pr³⁺ (x=0～0.6) were prepared by solid state reaction route and their properties were investigated by photoluminescence (PL) spectra and XRD,
respectively. All samples have a red emission peak at 612nm due to the intra-4f transition of Pr³⁺ from ¹D₂ to ³H₄ state. The results
indicate that both emission intensity and a axis parameter show an extremum at x=0.15: the emission intensity is enhanced about 3 times, and the lattice
parameter of a axis shows a minimum value. The results show that, besides the charge defects induced by unequilvalent ion substitution, the equilvalent
Sr²⁺ substitution for Ca²⁺ can also influence the emission intensity through the crystal structure evolution.

Key words: perovskite structure, calcium titanate, solid solution, luminescence

CLC Number:

TQ422

PENG Li-Xia,HONG Zhang-Lian,ZHOU Shi-Feng,WANG Min-Quan. Effect of Sr²⁺ Substitution for Equivalent Ca²⁺ Ions on Luminescence Intensity of CaTiO₃:0.002Pr³⁺[J]. Journal of Inorganic Materials.

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Effect of Sr²⁺ Substitution for Equivalent Ca²⁺ Ions on Luminescence Intensity of CaTiO₃:0.002Pr³⁺

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