Sr_(1-x)Zn_xY_2S_4∶Er^(3+),Eu^(2+)荧光粉的合成与发光特性的研究

Preparation and Luminescence Properties of Sr_(1-x)Zn_xY_2S_4∶Er^(3+),Eu^(2+) Phosphors

采用碳酸盐前躯体高温分解法合成了Sr1-xZnxY2S4∶Er3+,Sr1-xZnxY2S4∶Eu2+和Sr1-xZnxY2S4∶Er3+,Eu2+红色荧光粉。XRD图谱表明,Zn2+掺杂量x<0.2 mol时,粉末样品为CaFe2O4型正交晶体。Zn2+离子在Sr1-xZnxY2S4∶Er3+,Eu2+中的固溶量(xmol)对荧光粉的发射强度影响很大。随着Zn2+离子掺杂浓度的增加,Sr1-xZnxY2S4∶Er3+,Eu2+(SZYSEE)紫外区激发峰(200~413 nm)发生红移,并与可见光激发带(413~600 nm)形成一个连续的宽带谱,与紫外和GaN基LED芯片辐射都有良好的匹配性。当Zn2+掺杂量为0.1 mol时,SZYSEE的发光强度达到最大,其发光强度比未掺Zn2+的增强10.7倍。Sr0.9Zn0.1Y1.76S4∶0.24Er3+,0.006Eu2+是一种潜在的白光LED用红色荧光粉。

Sr1-xZnxY2S4： Er^3＋, Sr1-xZnxY2S4 ： Eu^2＋ and Sr1-xZnxY2S4 ： Er^3＋ , Eu^2＋ phosphors were prepared by calcining the carbonate precursors. XRD patterns showed that the synthesized crystalline powders possessed the orthorhombic [ CaFe2O4 ]-type structure as the Zn^2＋ concentration （x） was less than 0.2 mol. The emission intensity of Sr1-xZnxYES4 codoped with Eu^2＋ ＋ Er^3＋ depended strongly on the Zn^2＋ concentration. With an increase in the Zn^2＋ concentration（x）, the excitation band setting in ultraviolet area （250-413 nm） showed red shift and the excitation intensity in the visible light range （413 -600 nm） showed noticeable increase. When x was equal to 0.1 mol, the emission intensity of the SZYSEE phosphor reached the maximum, and there was an obviously broad excitation band centered in 450 nm from 200 - 600 nm, which perfectly matched the emission spectra of both the ultraviolet and emission of GaN-based LED. The Sr0.9Zn0.1 Y1.76 S4： 0.24Er^3＋, 0. 006Eu^2＋ was considered as a novel red phosphor candidate for white-LED.