【摘要】 以钼酸铵、硝酸钙和三氧化二铕为原料,通过化学沉淀法制备稀土掺杂的发红光材料CaMoO4:Eu3+,并利用X射线衍射、激发发射光谱对粉体的结构、发光性能进行了表征.实验结果表明,在反应溶液pH值为7、反应温度为60℃、烧结温度为900℃、掺入物质的量分数为25%的Eu3+的工艺条件下制备了质量性能优良的CaMoO4:Eu3+粉体.该荧光粉可被394 nm的紫外光和465 nm的可见蓝光有效激发,发射光谱在616 nm处发光强度最大,是以电偶极跃迁5D0→7F2为主导地位的红光发射,CaMoO4:Eu3+粉体是一种可能应用在白光LED上的红色荧光材料.更多还原

【Abstract】 The RE-doped luminescent powder CaMoO4:Eu3+ was prepared by chemical precipitation method with the ammonium molybdate,carium nitrate and europium oxide as raw materials.Experimental results showed that the high-quality single-phase luminescent powder CaMoO4:Eu3+ was prepared with the process parameters that the pH value of solution is about 7,reaction temperature is 60 ℃,sintering temperature is 900 ℃ and the dosage of the dopant Eu3+ is 25 wt%.The CaMoO4:Eu3+ products were characterized by XRD and excitation-emission spectrography.It was found that the powder can be excited efficiently by the ultraviolet light with wavelength 394 nm or visible blue light with wavelength 465 nm,and the highest luminous intensity is at 616 nm on the emission spectrum,where the luminescence is in reddish tone due to the dominant electric dipole transition from 5 D0 to 7 F2.The luminescent powder CaMoO4:Eu3+ is therefore a prospective reddish-tone phosphor applied to achromatic-light LEDs.更多还原