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中文摘要：
采用水热法合成了KCaY（PO4）2∶Tb^3＋绿色荧光粉,利用X射线粉末衍射仪（XRD）、场发射扫描电子显微镜对样品的结构和形貌进行了表征。XRD光谱表明合成的物质为纯相的KCaY（PO4）2晶体,属于六方晶系。扫描电镜照片显示样品呈规则的四、六棱柱形状。对样品的发光性质研究表明,随着Tb3＋浓度增加,离子间的交叉弛豫增强,发射光的颜色从蓝绿色变为黄绿色。通过在上述样品中共掺杂Eu^3＋,利用Tb^3＋→Eu^3＋的能量传递实现了发射光的颜色从绿色到白色连续调制。该荧光粉适合作为紫外、真空紫外光激发的单一基质白光发射荧光粉。
英文摘要：
KCaY（PO4）2∶Tb^3＋ phosphor was synthesized by the hydrothermal method and characterized by X-ray diffraction（XRD） and scanning electron microscope（SEM）.The XRD patterns demonstrated that the synthetic material belonged to the phase of KCaY（PO4）2 crystal without detectable impurity.The SEM image showed that the morphology of the product was completely in the form of quadrangular and prismhexagonal prisms.Under the excitation of ultraviolet（218 nm）,the emission spectra exhibited multi emission peaks from blue to red.Tunable emission from the greenish-blue to yellowish-green region was achieved by changing concentration of Tb^3＋.In order to obtain white light emission,Eu^3＋ was introduced into KCaY（PO4）2∶Tb^3＋ host.A low color temperature white light was achieved by an effective energy transfer from Tb^3＋ to Eu^3＋.KCaY（PO4）2∶Tb^3＋,Eu^3＋ can be used as a potential single-phased white phosphor excited by ultraviolet or vacuum ultraviolet.
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