“…For example, as a widely used green luminescence center, Tb 3+ ions generally show emission bands corresponding to 5 D 4 → 7 F 6, 5, 4, 3 transitions and the emission corresponding to 5 D 4 → 7 F 5 transition is dominated. [2][3][4][5][6] However, as a widely used red luminescence center, Eu 3+ ions generally show emission bands corresponding to 5 D 0 → 7 F 1, 2, 3, 4 transitions and the relative intensities of 5 D 0 → 7 F 1, 2 transitions depend on the host. The emission induced by 5 D 0 → 7 F 1 transition is dominated while they are in situations with the inversion symmetry, such as TbBO 3 , 7 NaCaBi(TeO 6 ) 8 and Ba 2 Ln 2/3 TeO 6 (Ln = La, Pr, Ng, Sm and Eu).…”