采用高温固相法合成了近紫外光激发CaLa2-xZnO5∶Eux(x＝0．01~0．2),研究了 Eu3＋掺杂浓度对晶体结构、形貌和光谱性能的影响.对样品分别进行了 X 射线衍射(XRD)物相分析、扫描电镜(SEM)测试和荧光光谱测定(PL).结果表明,该荧光材料为CaLa2 ZnO5单一相,属四方晶系空间群结构,形貌规则,尺寸为3~4μm,激发峰范围为250~475 nm,最强锐峰位于395 nm,发射主峰均位于625 nm,发光最强时,Eu3＋掺杂量为10％(摩尔分数).该荧光材料能有效地吸收350~475 nm 的近紫外光,发出较强的红光,适用于近紫外光激发的白光LED.
CaLa2-xZnO5∶Eux(x=0.01-0.2)with near-UV light excitation were synthesized by high temperature solid-state reaction method.The effect of Eu3+ on crystal structure,morphology and luminescence properties were investigated by XRD,SEM and PL meas-urements.The results indicated that the phosphors only had Ca-La2 ZnO5 phase,which was belonged totetragonal structure.The phosphors had a regular shape and the size was approximately 3-4μm.All excitation peaks were in range of 250-475 nm,and the strongest peak located at 395 nm.The emission peaks located at 625 nm,and the strongest intensity was obtained with 10 mol% of Eu3+ions,as an optimum dopant concentration.The phosphors can effectively absorb UV-light of 350-475 nm and then emit strong red light,which was suitable for white LED under the near-UV excitation.
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