单一基质白光荧光粉Ba_3Y_(1-x)(PO_4)_3:xDy^(3+)的合成及其发光特性

Luminescence properties of single host Ba_3Y_(1-x)(PO_4)_3:xDy^(3+) white-emitting phosphor

采用高温固相法,合成了Ba3Y1-x(PO4)3:xDy3+荧光粉。X射线衍射(XRD)图谱表明,合成物质为纯相Ba3Y(PO4)3晶体。激发谱和发射谱表明,样品的主发射峰位于486nm(4F9/2→6H15/2)和575nm(4F9/2→6H13/2),为典型的Dy3+特征发射,对应于样品的蓝光和黄光发射,其中以348nm激发时得到的峰值最强。样品的主激发峰有8个,均为Dy3+吸收,分别位于292nm(6H15/2→4D7/2),322nm(6H15/2→6P3/2),348nm(6H15/2→6P7/2),362nm(6H15/2→6P5/2),385nm(6H15/2→4M21/2),424nm(6H15/2→4G11/2),452nm(6H15/2→4I15/2)和473nm(6H15/2→4F9/2)处。研究了Dy3+掺杂浓度对发光性能的影响,在掺杂浓度x=0.08时,出现了浓度猝灭,浓度猝灭机理为电偶极-电偶极相互作用;不同Dy3+掺杂浓度荧光粉发射光的色坐标均在白光区域中。同时,研究了敏化剂Ce3+对Ba3Y(PO4)3:Dy3+材料发光强度的影响。

Ba3Y1-x（PO4）3：xDy3＋ phosphors wer e synthesized by high temperature solid state reactions.The X-ray diffraction （XRD） indicates that the sample′s crystalline structure is a pure phase of Ba3Y（PO4）3.The main emission peaks are located at 486nm（4F9/2→6H15/2） and 575nm（4F9/2→6H13/ 2）,which are the typical emission peaks of Dy3＋,correspondi ng to blue and yellow emissions,respectively.The most intense emission is excited by 348nm.There are 8main excitation peaks,located at 292nm（6H15/2→4D 7/2）,322nm（6H15/2→6P3/2）,348nm（6H15/2→6P7/2）,362nm（6H15/2→6P5/2）,385nm（6H15/2→4M21/2）, 424nm（6H15/2→4G11/2）,452nm（6H15/2→4I15/2） and 473 nm（6H15/2→4F9/2）.We stud y the effect of the doping concentration of Dy3＋ activator on the luminescence properties and find the concentration quenching w hen x=0.08,and the mechanism of concentration quenching was dipole—dipole interaction.All of them are in the white region of the CIE diagrams.At the same time,we investigate the influence of sensitizer Ce3＋ on the luminesc ent intensity of Ba3Y（PO4）3：Dy3＋.