CaMoO_4∶Eu^(3+),M^+(M=Li,Na,K)粉体的制备与发光性能研究

Synthesis and luminescent properties of CaMoO_4∶Eu^(3+),M^+(M=Li,Na,K) phosphors

采用溶胶-凝胶法制备了Ca_(1-1.5x)MoO_4∶xEu^(3+)和Ca_(0.5)MoO_4∶0.25Eu^(3+),M^+(M=Li,Na,K)荧光粉,并对样品的物相结构、颗粒形貌及发光性能进行了分析。结果表明,样品属于四方晶系,颗粒接近八面体形状,大小为2~3μm。激发光谱显示,样品的激发中心分别位于364 nm、386 nm、396 nm、419 nm和466 nm,最大激发峰值位于396 nm。在396 nm近紫外光激发下,样品的发射中心分别位于596 nm、616 nm、656 nm、704 nm,特征发射峰为616 nm,Eu3+离子掺杂浓度为25%(体积分数)时发光强度最强,引入的3种电荷补偿剂M^+(M=Li,Na,K)中,Li+对发光强度的提高最为显著。

Ca（1-1.5x）MoO4∶xEu^3＋ and Ca（0.5）MoO4∶0.25Eu^3＋,M^＋（M=Li,Na,K） phosphors were prepared successfully via sol-gel method. The crystal structure,particle morphology and luminescent properties of the samples were analyzed. Results show that the samples belong to tetragonal crystal system. The morphology of samples is nearly octahedron with size ranging from 2-3 μm. The excitation spectra show that excitation peaks locate 364 nm,386 nm,396 nm,419 nm and 466 nm,respectively. The strongest excitation peak locates 396 nm. The emission spectra of samples exhibit emission peaks locate 596 nm,616 nm,656 nm and 704 nm individually,characteristic emission peak locates 616 nm. When Eu^3＋ion doping concentration is 25%（volume percent）,the luminescent intensity reaches maximum value. Among Li^＋,Na^＋and K^＋ introduced as charge compensating agent,the effect of Li-＋ on the luminescent intensity is the most significant.