荧光粉Ca_4Y_6O(SiO_4)_6:Dy^(3+)的制备与发光特性(英文)

Synthesis and Luminescent Characteristics of Phosphor Ca_4Y_6O(SiO_4)_6:Dy^(3+)

采用高温固相法制备了Ca4Y6O(SiO4)6∶Dy3+荧光材料,通过样品的XRD谱证明了Ca4Y6O(SiO4)6∶Dy3+荧光材料是纯相的结构材料,通过发射光谱和激发光谱等发光特性的研究发现该荧光粉材料有多个发射峰,分别位于480 nm和573 nm处。监测蓝峰(480 nm)和黄峰(573 nm),测得材料的激发谱均为多锐峰(位于293,323,348,363,386,424,452 nm),均属于Dy3+的特征吸收峰,其中以348 nm的激发峰最强。探讨了Dy3+的掺杂量对样品黄蓝峰发射强度比(IY/IB)、发光色坐标及色温的影响。分析了Dy3+的浓度对荧光粉发光的影响及其浓度猝灭机理。

The Ca4Y6O（ SiO4 ）6：Dy^3＋ phosphor was synthesized by high temperature solid state reaction, and the luminescent properties were investigated. The XRD patterns indicated that the phosphor of Ca4Y6O （SiO4 ）6： Dy^3＋ was pure crystalline phase. The study on the luminescent properties showed that the phosphor exhibits two emission bands centering at 480 nm and 573 nm. The excitation spectra for blue emission （480 nm） and yellow emission （573 nm） both have several sharp peaks, locating at 293,323,348,363,386,424,452 nm, which are assigned to the typi- cal transitions of Dy^3 ＋. The strongest peak appears at 348 nm. The influence of the doped concentration of Dy^3＋ on the ratio of yellow to blue emission intensity （ IY/IB ）, with the emission color coordinates and color temperature of phosphor Ca4Y6O（ SiO4 ） 6： Dy^3＋ were studied. The effect of Dy^3 ＋ concentration on the luminescence and the quenching mechanism according to the Dexter theory were also analyzed.