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 result 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.
参考文献
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