【文章名】Preparation, Characterization, and Photoluminescence Properties of Tb(3+)-, Ce(3+)-, and Ce(3+)/Tb(3+)-Activated RE(2)Si(4)N(6)C (RE = Lu, Y, and Gd) Phosphors
Preparation, Characterization, and Photoluminescence Properties of Tb(3+)-, Ce(3+)-, and Ce(3+)/Tb(3+)-Activated RE(2)Si(4)N(6)C (RE = Lu, Y, and Gd) Phosphors
[摘要]：Photoluminescence properties of Tb(3+) and Ce(3+) singly doped and Ce(3+)/Tb(3+)-codoped RE(2)Si(4)N(6)C (RE = Lu, Y, and Gd) phosphors were investigated. Tb(3+) shows similar luminescence properties in RE(2)Si(4)N(6)C (RE = Lu, Y, and Gd) host lattices and emits bright green light under UV excitation around 300 nrn. The luminescence properties of Ce(3+) in RE(2)Si(4)N(6)C host lattices are influenced by the size of the RE(3+) ions (Lu(2)Si(4)N(6)C and Y(2)Si(4)N(6)C vs Gd(2)Si(4)N(6)C). Both Ce(3+)-activated Lu(2)Si(4)N(6)C and Y(2)Si(4)N(6)C phosphors exhibit a broad band emission in the wavelength range of 450-750 nm with peak center at about 540 am, while Ce(3+)-activated Gd(2)Si(4)N(6)C shows a broad emission band in the wavelength range of 500-800 nm with peak center at about 610 nm. This difference is ascribed to the different site occupations of Ce(3+) on the two crystallographic sites in Gd(2)S(4)N(6)C as compared to the Y and Lu compounds. In Ce(3+)/Tb(3+)-codoped RE(2)Si(4)N(6)C (RE = Lu,Y, and Gd) phosphors, it is observed that energy transfer takes place from Ce(3+) to Tb(3+) in Ce(3+)/Tb(3+)-codoped Lu(2)Si(4)N(6)C and Y(2)Si(4)N(6)C but in the reversed direction from Tb(3+) to Ce(3+) in Ce(3+)/Tb(3+)-codoped Gd(2)Si(4)N(6)C, depending on the position of the 5d level of Ce(3+) versus the 5D(4) level of Tb(3+). The potential applications of these phosphors are pointed out.
