采用高温固相法制备了红色荧光粉Ca4LaNb(W1-xMox)4O20∶Eu3+ 并研究了样品的发光性质。Ca4LaNbW4O20∶Eu3+的激发光谱中包含一个宽的激发带, 峰值位于275 nm, 归属于WO2-4基团的电荷迁移跃迁。随着Mo6+离子的掺入, Ca4LaNbW4O20∶Eu3+位于275 nm处的吸收带变宽, 其原因是O2- -Eu3+的电荷迁移跃迁增强。在Ca4LaNb(W1-xMox)4O20∶Eu3+的发射光谱中, 400～500 nm间较宽的发射带属于WO2-4基团的发射带, 而位于591 nm和616 nm的尖锐的发射峰分别属于Eu3+的5D0→7F1磁偶极跃迁和5D0→7F2电偶极跃迁发射。随着Mo6+离子浓度的增加, WO2-4基团的发射带强度下降, 从而提高了色纯度。

Red-emitting phosphors Ca4LaNb(W1-xMox)4O20∶Eu3+ were synthesized by the solid-state reaction, and the photoluminescence properties of these compounds were investigated. The excitation spectra of Ca4LaNbW4O20∶Eu3+ show a broad excitation band centered at 275 nm, which attribute to the charge transfer (CT) transition of WO2-4 complex. With the introduction of Mo6+ ions into Ca4LaNbW4O20∶Eu3+, the absorption band at 275 nm broadens due to the enhancement of CT transitions of O2--Eu3+. The emission spectra of Ca4LaNb(W1-xMox)4O20∶Eu3+ exhibit sharp emission peaks at 591 and 616 nm of Eu3+ transitions and a 400～500 nm broad emission band of WO2-4 transition. With the increase of Mo6+ content, the intensity of broad emission band of WO2-4 transition decreases. The pure red color is obtained.