Dy^(3+),Eu^(3+)共掺杂铌酸钾铅粉体的发光性能研究

Luminescent Performances of Dy^(3+) and Eu^(3+) doped PKN Phosphor

采用高温固相法制备了单掺Dy^(3+)和共掺Dy^(3+),Eu^(3+)的铌酸钾铅(Pb_2KNb_5O_(15),PKN)荧光粉。结果表明,PKN的最佳烧结温度为1 200℃,并且掺杂Dy^(3+)和Eu^(3+)造成晶格常数变小。Dy^(3+)在PKN中的最佳掺杂浓度为2.0mol%,并且利用强极化的Pb^(2+)对Dy^(3+)的强烈作用,使Dy^(3+)的最强激发峰从紫光波段移至蓝光波段,可与目前市场上商用蓝光芯片匹配。460 nm激发光能够同时激发Dy^(3+)和Eu^(3+)发光,并且当Dy^(3+)和Eu^(3+)的共掺浓度分别为2.0mol%和1.5mol%时,PKN荧光粉的色温接近暖白光的理想色温3 000 K。Dy^(3+)和Eu^(3+)共掺杂的PKN荧光粉是一种有望用于暖白光LED的候选材料。

Dy^3＋doped and Dy^3＋, Eu^3＋ co-doped PKN phosphor powder were synthesized by high temperature solid state method in this paper. The results of XRD show that the optimal sintering temperature is 1 200℃, while Dy^3＋ and Eu^3＋ doping cause the lattice constant smaller. The optimal doping concentration of Dy^3＋ doped PKN is 2.0mol%. Utilizing the intense effect of the strongly polarized Pb^3＋ on Dy^3＋, the strongest excitation peak of PKN： Dy shifts from the ultraviolet region to blue band, and makes the phosphor match with the commercial blue chip. Both Dy^3＋ and Eu^3＋ can emit light when excited by blue light of 460 nm. The CCT of PKN phosphor is close to the ideal warm white light value of 3 000 K when the doping concentration of Dy^3＋ and Eu^3＋ are 2.0mo1% and 1.5mo1%, respectively. PKN：Dy, Eu phosphor is a candidate material that could be expected to be used to warm white LED.