K_2ZnSiO_4∶Eu^(3+)红色荧光粉的制备及发光性能

Synthesis and Luminescence Properties of K_2ZnSiO_4∶Eu^(3+) Red Phosphor

采用高温固相法合成了适合近紫外光、蓝光激发的K2ZnSiO4∶Eu3+红色荧光粉,研究了该荧光粉的发光特性。XRD结果显示,所合成的荧光粉主晶相为K2ZnSiO4。样品的激发光谱由O2-→Eu3+电荷迁移带(200~350nm)和Eu3+离子的特征激发峰(350~500nm)组成,最强峰位于396nm,次强峰位于466nm。在396nm和466nm激发下,样品均呈多峰发射,分别由Eu3+离子的5D0→7FJ(J=0,1,2,3,4)能级跃迁产生,其中619nm处峰值最大。增加Eu3+离子的掺杂浓度,荧光粉的发光逐渐增强。在实验测定的浓度范围内,未出现浓度猝灭现象。不同Eu3+浓度样品的色坐标均位于色品图红光区,非常接近NTSC标准。

The red phosphor K2ZnSiO4∶ Eu3 +which could be effectively excited by ultraviolet and blue light was synthesized by high temperature solid state reaction,and its luminescent characteristics were also investigated. The principal crystalline phase of the samples is K2ZnSiO4. The excitation spectra of the sample consist of O2-→Eu3 +charge transitions( 200-350 nm) and Eu3 +ion excitation peak( 350-500 nm). The maximum peak appears at 396 nm and the second peak appears at 466 nm. The phosphor presents several emission peaks under 396 nm and 466 nm excitation,which correspond to the5D0→7FJ( J = 0,1,2,3,4) transition of Eu3 +,respectively,and the strongest emission is located at 619 nm. The luminescent intensity increases with the increasing of Eu3 +content. The concentration quenching does not occur. The CIE coordinates of K2ZnSiO4∶ Eu3 +are very close to the NTSC standard.