The synthesis and photoluminescence properties investigation of a versatile phosphor Sr₁₀[(PO₄)_5.5(BO₄)_0.5](BO₂): Sb³⁺/Eu³⁺/Pr³⁺/Dy³⁺

A series of versatile phosphors Sr₁₀[(PO₄)_5.5(BO₄)_0.5](BO₂):Sb³⁺/Eu³⁺/Pr³⁺/Dy³⁺ were firstly synthesized by solid-state method. The phase purity was analyzed through X-ray diffraction and their characteristic luminescence properties were investigated. The results showed that Sr₁₀[(PO₄)_5.5(BO₄)_0.5](BO₂): Sb³⁺ exhibited broad blue emission centered at 459 and 467 nm, due to the selective excitation transitions (³P_1/0→¹S₀) of Sb³⁺ occupying different crystal sites in Sr₁₀[(PO₄)_5.5(BO₄)_0.5](BO₂). The emission spectrum of Sr₁₀[(PO₄)_5.5(BO₄)_0.5](BO₂): Eu³⁺ consisted of a series of lines attributed to the ⁵D₀→⁷F_J (J=1, 2, 3, 4) transitions of Eu³⁺. Moreover, an unusual blue emission band was observed, which was discussed in detail and proved to be related to the vacancy of Sr²⁺ through the charge compensation mechanism. In addition, red and warm white emissions could be obtained from Pr³⁺ and Dy³⁺ single doped Sr₁₀[(PO₄)_5.5(BO₄)_0.5](BO₂) and their luminescence properties were discussed, respectively.