采用高温固相法制备了Ca10Li(PO4)7∶Dy3+发光材料,研究了Dy3+在Ca10Li(PO4)7基质中的发光特性。XRD测量结果表明, 烧结温度为1 050 ℃时所制备的样品为纯相Ca10Li(PO4)7晶体。从激发谱可以看出样品主激发峰位于349 nm(6H15/2→6P7/2),363 nm(6H15/2→6P5/2),385 nm(6H15/2→6M21/2),样品可被UV-LED管芯有效激发。发射谱由位于481 nm(蓝)和572 nm(黄)的两个峰组成,对应的能级跃迁为4F9/2→6H15/2、6H13/2。研究了不同Dy3+掺杂浓度对发光强度的影响,当Dy3+的摩尔分数为10%时发光最强。掺入Ce3+作为敏化剂,Ce3+→Dy3+发生共振能量传递,当掺杂量为10%Dy3+、14%Ce3+时,样品发光最强,其强度为单掺10%Dy3+时的13.4倍,发光颜色由黄白变为蓝白。

A novel Ca10Li(PO4)7∶Dy3+ phosphor was prepared by solid state reaction method, and its luminescence properties were studied. XRD results showed that 1 050 ℃ was a suitable sintered temperature for preparation of Ca10Li(PO4)7∶Dy3+ phosphors. The main excitation peaks were located at 349 nm (6H15/2→6P7/2), 363 nm (6H15/2→6P5/2) and 385 nm (6H15/2→6M21/2). The sample can be excited by UV-LED. The emission spectra composed two peaks, which were located at 481 nm (blue) and 572 nm (yellow), corresponding to the 4F9/2→6H15/2、6H13/2 typical transition of Dy3+.The influence of doped Dy3+ concentration on the luminescent intensity of Ca10Li(PO4)7∶Dy3+ was investigated. The relative intensity of Ca10Li(PO4)7∶Dy3+ sample reached the maximum value when Dy3+mole fraction was 10%. The intensities increased with Ce3+ mole fraction. The relative intensity of the sample reached the maximum value when Dy3+ mole fraction was 10%, Ce3+mole fraction was 14%. The intensity is 13.4 times higher than the original. The color of the phosphor was changed from yellow-white to blue-white.