The energy corresponding to the excitation edge in Eu²⁺-doped phosphate phosphors of the type A^IB^IIPO₄ (A^I = monovalent cation, B^II = divalent cation) is calculated from the knowledge of two crystal-structure-related factors he(X(i)) and Fc(X(i)) which are connected respectively to the crystal field splitting (CFS) and the centroid energy (Ec) of the excited 4f⁶5d¹ electron configuration of Eu²⁺. The calculation is carried out for each cation site X(i) available for Eu²⁺ in 25 different compositions of A^IB^IIPO₄ including NaZnPO₄-Eu²⁺ for which the luminescence is firstly reported. Our results indicate (1) that is it possible to identify the nature of the cation site that contributes to the excitation edge of Eu²⁺ in A^IB^IIPO₄ within an accuracy of±1000 cm^-1 and (2) that the method can be used as a tool for the predictive design of A^IB^IIPO₄ - Eu²⁺ phosphors applicable in solid state LED-based lighting.

根据两个与晶体结构有关的因素的知识，计算出与A ^I B ^II PO ₄类型的Eu ²⁺掺杂的磷光粉（A ^I =单价阳离子，B ^II =二价阳离子）中的激发边相对应的能量。he（X（i））和Fc（X（i））分别与Eu ²⁺的激发4f ⁶ 5d ¹电子构型的晶体场分裂（CFS）和质心能（Ec）连接。针对A ^I B ^II PO _4的25种不同组成中的Eu ²⁺可用的每个阳离子位点X（i）进行计算包括首次报道其发光的NaZnPO ₄ -Eu ²⁺。我们的结果表明（1）可以确定以±1000 cm ^-1的精度在A ^I B ^II PO _4中对Eu ²⁺的激发边缘有贡献的阳离子位点的性质，以及（2）该方法可用作用于固态LED照明的A ^I B ^II PO ₄ -Eu ²⁺荧光粉的预测设计的工具。