Nitrogen-rich Eu²⁺-doped Ca-α-SiAlON phosphors (Ca_m/2−xSi_12−m−nAl_m+nO_nN_16−n:xEu) were synthesized by a freeze-drying assisted combustion synthesis (CS) route. Fast-synthesized products with high purity and uniform particle morphology were confirmed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The analysis of lattice parameters by comparison with empirical equations showed that the as-prepared phosphors had low oxygen content. A series of samples were prepared according to the stoichiometry of Ca_m/2−0.08Si_12−mAl_mN₁₆:0.08Eu for further research. The influences of m value on the luminescence properties were investigated in detail. As m increased, a redshift phenomenon was observed in both the excitation and emission spectra. First-principle electronic structure calculations showed that the 3d energy level of Ca played an important role in the occurrence of the redshift phenomenon.

通过冷冻干燥辅助燃烧合成了富氮Eu ²⁺掺杂的Ca-α-SiAlON磷光体（Ca _{m / 2- x} Si _{12 -m-n} Al _{m + n} O _n N _{16- n}：x Eu）。综合（CS）路线。通过X射线衍射（XRD）和扫描电子显微镜（SEM）确认了具有高纯度和均匀颗粒形态的快速合成产物。通过与经验方程比较分析晶格参数表明，所制备的磷光体具有低的氧含量。根据Ca _{m /2-0.08} Si _{12- m}的化学计量制备了一系列样品Al _m N ₁₆：0.08Eu有待进一步研究。详细研究了m值对发光性能的影响。随着m的增加，在激发光谱和发射光谱中都观察到红移现象。第一性原理电子结构计算表明，Ca的3d能级在红移现象的发生中起重要作用。