Dy^(3+)、Tm^(3+)共掺杂Ca2MgSi2O7的发光特性

Luminescent Properties of Dy^(3+),Tm^(3+) Co-doped Ca_(2)MgSi_(2)O_(7)

采用高温固相法合成了系列Ca_2MgSi_2O_7∶Dy^(3+),Tm^(3+)发光材料。对样品进行了XRD结构表征,测量了激发光谱、发射光谱、色温和荧光寿命。研究结果表明,Ca_2MgSi_2O_7∶Tm^(3+)在355 nm激发下显示出蓝色发光,在CIE1931中的色坐标为x=0.165 9,y=0.082 2,色纯度为89%。通过Dy^(3+)和Tm^(3+)的叠加激发谱带激发,即在349,353,365 nm激发下,Ca_2MgSi_2O_7∶Dy^(3+),Tm^(3+)显示出青白、冷白和暖白光,相关色温值分别为5 193,9 672,4 685 K。300~500 nm区域间可以有效地激发Ca_2MgSi_2O_7∶Dy^(3+),Tm^(3+),并在400~600 nm之间产生蓝光和黄光复合产生的白光,表明该体系可用作白光LED的发光材料。

A series of Ca 2MgSi 2O 7 ∶Dy 3＋ ,Tm 3＋ luminescent materials were synthesized by high temperature solid phase method. The samples were characterized by XRD structure, and the excitation spectra, emission spectra, color temperature and fluorescence lifetime were measured. The results show that Ca 2MgSi 2O 7 ∶Tm 3＋ exhibits blue luminescence under the excitation of 355 nm. The color coordinate in CIE1931 is x =0.165 9, y =0.082 2, and the color purity is 89%.Excited by the superposition excitation bands of Dy 3＋ and Tm 3＋ （349, 353, 365 nm）, Ca 2MgSi 2O 7 ∶Dy 3＋ ,Tm 3＋ phosphors show bright white, cool white and warm white light, and the correlation color values are 5 193, 9 672, 4 685 K, respectively. In conclusion, Ca 2MgSi 2O 7 ∶Dy 3＋ and Tm 3＋ can be effectively excited by 300-500 nm regions and emit white light produced by blue and yellow light combinations between 400-600 nm, shows that the system can be used as a luminescent material for white LED.