采用两步法成功合成了单一基质双光色Ba10-x(PO4)4(SiO4)2∶xEu2+荧光粉, 研究了稀土离子占据不同的晶格格位对荧光粉光谱特性的影响。结果表明: 两步法合成的荧光粉发射光谱由414 nm的蓝光波带和504 nm绿光波带两种光色组成, 而传统的高温固相法制备的荧光粉只有504 nm处的绿光发射。荧光粉发光性能与Eu2+离子在磷灰石晶体结构中占据的晶格位置关系十分密切。两步法荧光粉双光色的形成主要是由于在第一步氧化气氛合成过程中Eu3+离子取代了基质结构中的BaⅠ和BaⅡ两个格位的Ba2+离子; 在第二步还原过程结束后, Eu2+离子仍然占据着两种格位, 从而形成了两种具有不同配位环境的发光中心。此外, 双发射峰的相对强度能够通过Eu2+离子对BaⅠ格位的取代率而调节, 进而实现光谱的调变。

A series of single phase Eu2+-activated barium phosphosilicates phosphors, Ba10-x(PO4)4(SiO4)2∶xEu2+ , with apatite structure were successfully synthesized by a novel two-step method and they exhibited interesting two-color emission at 414 nm (blue) and 504 nm (green), respectively. As a significant contrast, the phosphors prepared via traditional solid state reaction method, only showed single-color emission at 504 nm. The luminescent properties of these as-prepared phosphors are strongly dependent on the substitute sites of Eu2+ in apatite crystal structure and the two-color emission was proved due to the occupation of Eu3+ on two lattice sites of BaⅠ and BaⅡ in host material. Furthermore, the relative intensity of two emission peaks can be tuned readily via adjusting the substitution of BaⅠ site by Eu2+.