低温燃烧法合成SrZnO2:Sm(上标 3+), Li(上标 +)及其发光性能研究

SrZnO2:Sm (superscript 3+), Li (superscript +) red-emitting phosphors were prepared by low-temperature combustion synthesis (LCS) and characterized by X-ray diffraction patterns (XRD), scan electron microscopy (SEM) and fluorescence (FL) spectrum. The crystal structure, shape and luminescent properties were also investigated. According to the results, it showed that the crystal structures of SrZnO2:Sm (superscript 3+), Li (superscript +) was in the orthorhombic system in the space group Pnma according to their XRD patterns, Sm (superscript 3+) and Li (superscript +) were both successfully doped into the crystal lattice of Sr2nO2 matrix and Sr (superscript 2+) asymmetry cationic sites were preferentially occupied by Sm(superscript 3+) ions. An emission at wavelength of 605nm orange- red light originated from 5G (subscript 5/2) to 6H (subscript 7/2) transition of Sr2nO2:Sm (superscript 3+), Li (superscript +) was observed. Otherwise, due to the energy transfer from a percolation cluster of the nearly-two-dimensional Sm (superscript 3+) sublattice to killer centers such as crystal defects, the concentration quenching of Sr2nO2:Sm (superscript 3+) appeared in varying degrees. Most of the red phosphors were spherical particles with a diameter of about 100~400nm, and few of them had an ellipsoidal shape with similar particle size variable range. The luminescence intensity of Sr2nO2:Sm (superscript 3+) can be significantly enhanced by co- doped with Li (superscript +) ions probably owing to charge compensation mechanism, and the relative luminescence intensity was the highest while Sm (superscript 3+) and Li (superscript 3+) were in the ratio of 1:3.