摘要
采用高温固相法制备K_(1−x)AlSi_(2)O_(6)∶xEu^(3+)和K_(0.93−x)AlSi_(2)O_(6)∶(0.07Eu^(3+)+xLa^(3+))(x=0.01,0.03,0.05,0.07,0.09,0.11,物质的量分数)红色荧光粉,研究了La^(3+)/Eu^(3+)掺杂对发光强度、荧光寿命、色坐标的影响规律。结果表明:Eu^(3+)单掺杂和Eu^(3+)+La^(3+)双掺杂后红色荧光粉的物相均为白榴石相,未出现新相;随着Eu^(3+)掺杂量的增大,白榴石相由四方结构向立方结构转变。随着Eu^(3+)掺杂量的增大,KAlSi_(2)O_(6)红色荧光粉的发光强度先增后减,当掺杂Eu^(3+)的物质的量分数为0.07时强度最大;随着La^(3+)掺杂量的增加,K_(0.93)AlSi_(2)O_(6)∶0.07Eu^(3+)荧光粉的发光强度先增后减,当La^(3+)掺杂物质的量分数为0.09时强度最大,比未掺杂La^(3+)时提升2倍以上。同时掺杂物质的量分数0.07 Eu^(3+)和0.09 La^(3+)时红色荧光粉的荧光寿命比单掺杂物质的量分数0.07 Eu^(3+)时更长,色坐标由单掺杂Eu^(3+)时的橙色向红色移动,红色成分更明显,表现出优异的红光发射性能。
Red phosphors K_(1−x)AlSi_(2)O_(6)∶xEu^(3+)and K_(0.93−x)AlSi_(2)O_(6)∶(0.07Eu^(3+)+xLa^(3+))(x=0.01,0.03,0.05,0.07,0.09,0.11,mole fraction)were prepared by high temperature solid-state method.The effects of La^(3+)/Eu^(3+)doping on luminescence intensity,fluorescence lifetime and color coordinate were studied.The results show that after Eu^(3+)single doping or Eu^(3+)+La^(3+)co-doping,the red phosphors were all composed of a leucite phase,and no new phase was found.With the increase of Eu^(3+)doping amount,the leucite phase changed from tetragonal structures to cubic structures.With the increase of Eu^(3+)doping amount,the luminous intensity of KAlSi_(2)O_(6)red phosphor increased first and then decreased,and the intensity was the highest when the mole fraction of Eu^(3+)was 0.07.With the increase of La^(3+)doping amount,the luminous intensity of K_(0.93)AlSi_(2)O_(6)∶0.07Eu^(3+)red phosphor increased first and then decreased.When the mole fraction of La^(3+)was 0.09,the intensity was the highest,which was more than twice as much as that without La^(3+)doping.Compared with that of the single doping 0.07 mole fraction of Eu^(3+),the fluorescence lifetime of KAlSi_(2)O_(6)based red phosphor co-doped with 0.07 Eu^(3+)and 0.09 La^(3+)was longer.The color coordinate under co-doping Eu^(3+)+La^(3+)moved from orange of single doping Eu^(3+)to red,and the red component was more obvious,showing excellent red emission performance.
作者
王之阳
王焕平
华有杰
邓德刚
莫志伟
高照
蒋宗恒
徐时清
WANG Zhiyang;WANG Huanping;HUA Youjie;DENG Degang;MO Zhiwei;GAO Zhao;JIANG Zongheng;XU Shiqing(College of Optical and Electronic Technology,China Jiliang University,Hangzhou 310018,China)
出处
《机械工程材料》
北大核心
2025年第2期69-73,共5页
Materials For Mechanical Engineering
基金
浙江省科技计划资助项目(2023C01090)。
