Optical Absorption and Photoluminescence Spectra of Ce-doped SrMgF4 Polycrystalline with Superlattice Structure

doi:10.15541/jim20210773

Abstract

Abstract:

Rare-earth (RE) ions doped perovskite-related fluorides are candidates for tunable optical materials. In this work, SrMgF₄: xCe (x=0, 0.007, 0.013 and 0.035, in mole) powders were synthesized by a precipitation method. X-ray diffraction (XRD) patterns indicate that the obtained phosphors possess monoclinic superstructures. Electrovalence analysis confirms the existence of Ce³⁺/Ce⁴⁺ mixed valence. Two distinct fluorescence bands B and C were observed with different excitation wavelengths in the ultraviolet (UV) light region. Energy levels were modified strongly by the crystal field derived from monoclinic superstructures when the symmetry of Ce³⁺-polyhedra changed from high- to low- symmetry.

Key words: SrMgF₄, Ce-doped, superstructure, perovskite, photoluminescence

CLC Number:

TQ174

LIU Qi, ZHU Can, XIE Guizhen, WANG Jun, ZHANG Dongming, SHAO Gangqin. Optical Absorption and Photoluminescence Spectra of Ce-doped SrMgF₄Polycrystalline with Superlattice Structure[J]. Journal of Inorganic Materials, 2022, 37(8): 897-902.

Figures/Tables 5

Fig. 1 XRD patterns of SrMgF4: xCe powders (x = 0, 0.007, 0.013, and 0.035)

Fig. 2 XPS spectra of SrMgF4: xCe powders (x = 0, 0.007, 0.013 and 0.035) (a) whole pattern; (b) Ce3d

Fig. 3 Absorption spectra of SrMgF4: xCe powders (x=0, 0.007, 0.013, and 0.035)

Fig. 4 Emission/excitation spectra of SrMgF4: xCe powders (x=0.007, 0.013 and 0.035). (a) λex=258 nm and λem=315 nm; (b) λex=295 nm and λem=336 nm

Fig. 5 Energy levels observed in SrMgF4: xCe powders (x=0.007, 0.013, and 0.035)

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Optical Absorption and Photoluminescence Spectra of Ce-doped SrMgF₄Polycrystalline with Superlattice Structure

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