Novel single-phased white-light-emitting and color tunable KBa(VO₄):Dy³⁺, Eu³⁺ phosphors were synthesized by solid-state reaction method. The crystal structures, luminescence properties, lifetime, and energy transfer mechanism were investigated in detail. A series of characteristic emissions of Dy³⁺ and Eu³⁺ were observed in the emission spectra at around 486 nm, 578 nm, 663 nm and 617 nm when excited at 349 nm. With the increase of Eu³⁺ concentration, the emission intensity and the decay lifetime of Dy³⁺ decreased, which proved the existence of the energy transfer from Dy³⁺ to Eu³⁺ in the KBa(VO₄) host. It was found that energy was transferred from ⁴F_9/2 level of Dy³⁺ to the ⁵D₀ level of Eu³⁺ by dipole-dipole interaction and the critical distance between Dy³⁺ and Eu³⁺ was 12.82 Å. In the case of Dy³⁺ and Eu³⁺ codoped phosphors, the color coordinates are very sensitive to the incorporation of Eu³⁺ ions and the correlated color temperature is improved with the introduction of Eu³⁺ ions. With 10 mol% Eu³⁺ phosphor can obtained maximum energy transfer efficiency of 83%. The experimental research shows that KBa(VO₄): xDy³⁺, yEu³⁺ phosphors are promising materials for white UV LEDs.

通过固相反应法合成了新型的单相发白光和可调色KBa（VO ₄）：Dy ³⁺，Eu ³⁺荧光粉。详细研究了晶体结构，发光性能，寿命和能量转移机理。当在349nm处激发时，在约486nm，578nm，663nm和617nm的发射光谱中观察到Dy ³⁺和Eu ³⁺的一系列特征发射。用Eu的增加³⁺浓度，发光强度和Dy的衰减寿命³⁺降低，这证明了从镝的能量传递的存在³⁺与EuKBa（VO ₄）主机中为³⁺。发现能量通过偶极-偶极相互作用从Dy ^3+的4 F _9/2能级转移到Eu ³⁺的⁵ D ₀能级，并且Dy ³⁺和Eu ³⁺之间的临界距离为12.82Å。在的Dy的情况下³⁺及Eu ³⁺共掺杂磷光体，所述颜色坐标与Eu的掺入非常敏感³⁺与引入的Eu的改进离子和相关色温³⁺离子。含10 mol％Eu ³⁺磷光体可以获得的最大能量传递效率为83％。实验研究表明，KBa（VO ₄）：xDy ³⁺，yEu ³⁺荧光粉是用于白色UV LED的有前途的材料。