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

作　　者：周文理[1] 朱爱玲[1] 廉世勋[1] 余丽萍[1] 荣春英[1] 

机构地区：[1]湖南师范大学化学化工学院资源精细化和先进材料湖南省高校重点实验室,湖南长沙410081

出　　处：《中国稀土学报》2009年第1期40-45,共6页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金(20371017;50772035);湖南省科技厅项目(06FJ3095)资助

摘　　要：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.

关 键 词：碱土稀土三元硫化物 Zn2+离子 红色荧光粉 发光二极管(LED) 稀土 

分 类 号：O614[理学—无机化学]