Research on the preparation of glass ceramics from yellow phosphorus slag doped with Tb3+ versus co-doped with Tb3+-Eu3+ and its luminescent properties

In this paper, different crystalline phases of yellow phosphorus slag glass ceramics doped with Tb ₄O ₇ were prepared by the melting-annealing method. It was found that there are characteristic peaks of Tb ³⁺ at 489 nm, 543 nm, 585 nm and 645 nm. In addition, the emission intensity at 543 nm is the strongest corresponding to the ⁵D ₄→ ⁷F ₅ transition of Tb ³⁺. Furthermore, it was observed that the glass ceramics show the brightest green emission when the main crystalline phase was CaSiO ₃ by comparing their luminescence properties. On this basis, CaSiO ₃ main crystal phase yellow phosphorus slag glass ceramics co-doped with Eu ₂O ₃-Tb ₄O ₇ were prepared, and the characteristic emission of Tb ³⁺ (543 nm) and Eu ³⁺ (618 nm) was obtained under the excitation of 380 nm. Combined with fluorescence lifetime analysis and Dexter’s theory, the energy transfer between Tb ³⁺ and Eu ³⁺ is proved through dipole-quadrupole interaction. With the increase of the doping concentration of Eu ³⁺, chromaticity coordinates of glass ceramics shifted from the green light region (0.3421,0.5138) to the red light region (0.6184,0.3472). The results show that CaSiO ₃ crystalline phase Eu ₂O ₃-Tb ₄O ₇ co-doped yellow phosphorus slag glass ceramics is a fluorescent material that can realize the green-red dual-based color tunable, and it has the potential to be applied in the field of red emitters and light-emitting diodes.