NaY(Mo/WO_4)_2∶Eu^(3+)红色荧光粉的合成和发光性能

Synthesis and Luminescence Properties of NaY(Mo/WO_4)_2∶Eu^(3+) Phosphors

利用固相法合成了Eu^(3+)掺杂的NaY(Mo/WO_4)_2红色荧光粉,并用对所获得的样品进行了XRD和激发-发射光谱表征。研究发现随着Eu^(3+)掺杂量逐渐增加,发光强度随之变化。当Eu^(3+)掺杂浓度为30mol%,荧光粉具有最强的发光强度。荧光粉能被395 nm波长紫外光有效激发,发射光谱主要体现为Eu^(3+)的5D0→7F2电偶极跃迁的红光发射,因此适合于解决白光LED缺乏红光成分而导致的显色性差问题。研究发现适量的W^(6+)取代Mo^(6+),不但可以提高荧光粉的发光强度,而且有利于改善材料的色纯度。W^(6+)的最佳掺杂浓度为10at%。在395 nm激发下,NaY(Mo_(0.9)W_(0.1)O_4)_2∶Eu^(3+)荧光粉的色度坐标为(0.666,0.331),优于传统商业红色荧光粉Y_2O_2S∶Eu^(3+)。

The NaY( Mo/WO_4)_2∶ Eu^(3+)phosphors were synthesized by solid state reaction method,and were characterized by XRD, excitation and emission spectra. The results show that the emission intensities of the phosphors vary with the substitutionconcentrations of Eu^(3+). When the concentration of Eu is 30mol%,the luminescent intensity of the phosphor is highest. Emission spectrum is mainly embodied in ~5D_0→~7F_2 of Eu^(3+) electric dipole transition of red light emission,which is suitable for solving white LED color problem caused by lack of red component. The appropriate amount of W^(6+) to Mo^(6+) can not only increase the red emission intensity of the phosphor,but improve the color purity. The optimum doping content of W^(6+) is found to be10at%. Under the 395 nm excitation, the CIE chromaticity coordinates of Na Y( Mo / WO_4)_2∶ Eu^(3+) red phosphors is( 0. 666,0. 331),which is better than that of traditional commercial red phosphors Y_2O_2S∶ Eu^(3+).