采用高温固相法制备了KNaCa2(PO4)2:Eu2+蓝色荧光粉,并研究了材料的发光特性.在400 nm近紫外光激发下,材料呈非对称的单峰发射,主峰位于470 nm.监测470 nm发射峰,对应的激发光谱覆盖200~450 nm,主峰位于400 nm,说明材料能够很好的吸收紫外?近紫外光,发射蓝色光.利用van Uitert公式计算了Eu2+取代KNaCa2(PO4)2中Ca2+时所占晶体学格位,得出461和502 nm发射分别归属于八配位和六配位的Eu2+发射.研究了Eu2+掺杂浓度对KNaCa2(PO4)2:Eu2+材料发射强度的影响,结果显示Eu2+的最佳掺杂浓度为1mol%,利用Dexter理论得出其浓度猝灭机理为电偶极?电偶极相互作用.
A blue phosphor,KNaCa2(PO4)2:Eu2+,was prepared by the high temperature solid-state method,and its luminescent characteristics were investigated.The spectral characteristics show that it can be effectively excited by near ultraviolet light(400 nm),and exhibits blue light(470 nm).The crystallographic sites of Eu2+ in KNaCa2(PO4)2 are calculated by van Uitert formula.In KNaCa2(PO4)2:Eu2+,the emission band centered at 461 nm originates from the Eu2+ center of the eight compounds,and the emission band centered at 502 nm originates from the Eu2+ center of the six compounds.The influence of Eu2+ concentration on the emission intensity of the phosphor is investigated.The re-sult shows that the emission intensities firstly increase with the increase in Eu2+ concentration,reach a maximum at 1mol% Eu2+,and then decrease.The concentration quenching mechanisms are the d-d interaction by Dexter theory.