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中文摘要：
采用高温固相法制备了KCaPO4：Eu^2＋蓝绿色荧光粉,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487 nm。监测487 nm发射峰,对应的激发光谱覆盖300-450 nm,说明材料能够很好的吸收紫外-近紫外光,发射蓝绿色光。利用van Uitert公式计算了Eu^2＋取代KCaPO4中Ca2＋时所占晶体学格位,得出478 nm和527 nm发射分别归属于八配位和六配位的Eu^2＋发射。研究了Eu^2＋掺杂浓度对KCaPO4：Eu^2＋材料发射强度的影响,结果显示,随Eu^2＋浓度的增大,材料的发射强度呈现出先增大后减小的趋势,强度最大处对应的Eu^2＋浓度为3%。利用Dexter理论对Eu^2＋发射的浓度猝灭机理进行了研究,结果表明,其源于电偶极-电偶极相互作用。
英文摘要：
A blue-greenish phosphor,KCaPO4：Eu^2＋,was prepared by the high temperature solid-state method,and its luminescent characteristics were investigated.The emission and excitation spectra indicate that it can be effectively excited by ultraviolet and near ultraviolet（300-450 nm） light,and exhibits satisfactory bluegreenish performance（487 nm）.The crystallographic sites of Eu^2＋ in KCaPO4 were calculated by the van Uitert formula.The results show that the 478 nm emission band originates from the eight sites of Eu^2＋,and the 527 nm emission band comes from the six sites of Eu^2＋.The effect of Eu^2＋ content on the emission intensity of this phosphor was investigated.The results show that the intensity firstly increases with increasing Eu^2＋ content,then decreases,and reaches the maximum at 3% Eu^2＋.The concentration quenching mechanisms are from the d-d interaction by Dexter theory.
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