Na+,Dy3+,Eu3+掺杂YAG荧光粉的光学性能

本文用高温固相法制备了Na⁺,Dy³⁺,Eu³⁺掺杂YAG系列荧光粉。通过改变掺杂的Dy³⁺浓度、激发波长、掺杂Na⁺,研究其对发光的影响。X射线衍射结果显示,硼酸、Na⁺、Dy³⁺、Eu³⁺掺入基本不影响YAG的立方晶相,且随Na⁺、Dy³⁺、Eu³⁺浓度增加,样品衍射峰位置向小角度偏移。用λ_em=590 nm监测Dy³⁺,15%Eu³⁺共掺YAG粉体,随Dy³⁺浓度增加,Eu³⁺和Dy³⁺的激发强度均先增大后减小。当用λ_ex=366 nm激发Dy³⁺,15%Eu³⁺共掺YAG粉体,此时存在Eu³⁺→Dy³⁺的能量传递,计算得到Eu³⁺→Dy³⁺的能量传递效率为84.23%。相比10%Dy³⁺,15%Eu³⁺共掺YAG,掺入0.5%Na⁺后,样品中Dy³⁺发光增强1.5倍,色坐标(0.348 1,0.397),色温5 010 K,接近标准白光。用λ_ex=394 nm激发Dy³⁺,15%Eu³⁺共掺YAG粉体,此时存在Dy³⁺→Eu³⁺的能量传递,计算得到Dy³⁺→Eu³⁺的能量传递效率为88.9%。相比10%Dy³⁺,15%Eu³⁺共掺YAG,掺入0.5%Na⁺后,Eu³⁺发光增强1.8倍,色坐标(0.466 7,0.416 8),色温2 650 K,达到商用暖白光标准。

Optical Properties of Na+, Dy3+ and Eu3+ Doped YAG Phosphors

The Na⁺, Dy³⁺, Eu³⁺ doped YAG series phosphors were prepared by high-temperature solid-phase method. Change the doped Dy³⁺ concentration, excitation wavelength, and doped Na⁺ to study its influence on luminescence. X-ray diffraction results show that the doping of boric acid, Na⁺, Dy³⁺, Eu³⁺ does not affect the cubic phase of YAG, and with the increase of Na⁺, Dy³⁺, Eu³⁺ concentration, the sample diffraction peak position shifts to a small angle. Use λ_em=590 nm to monitor Dy³⁺, 15%Eu³⁺ co-doped YAG powder, with the increase of Dy³⁺ concentration, the excitation intensity of Eu³⁺ and Dy³⁺ both increase first and then decrease. When λ_ex=366 nm is used to excite Dy³⁺, 15%Eu³⁺ co-doped YAG, at this time, there is an energy transfer of Eu³⁺→Dy³⁺, the calculated energy transfer efficiency of Eu³⁺→Dy³⁺ is 84.23%.Compared with 10%Dy³⁺, 15%Eu³⁺ co-doped YAG, the Dy³⁺ luminescence in the sample is enhanced by 1.5 times after doping 0.5%Na⁺, the color coordinate is (0.348 1,0.397), and the color temperature is 5 010 K, which is close to standard white light. When λ_ex=394 nm is used to excite Dy³⁺, 15%Eu³⁺ co-doped YAG, at this time, there is energy transfer from Dy³⁺→Eu³⁺, the calculated energy transfer efficiency of Dy³⁺→Eu³⁺ is 88.9%. Compared with 10%Dy³⁺, 15%Eu³⁺ co-doped YAG, Eu³⁺ luminescence is enhanced 1.8 times after doping 0.5%Na⁺, the color coordinate is (0.466 7, 0.416 8), and the color temperature is 2 650 K, which meets the commercial warm white light standard.