摘要
采用高温固相法合成了Eu^(3+)激活的Ba_3La_6(SiO_4)_6红色荧光粉并对其发光性质进行了研究。XRD谱显示,合成样品为纯相Ba_3La_6(SiO_4)_6晶体。样品的激发光谱由一系列宽谱组成,峰值分别位于300、364、384、395、416和466nm,其激发主峰位于395nm。在395nm激发下,荧光粉在619nm(~5D_0→~7F_2)处有很强的发射。研究了不同Eu^(3+)掺杂浓度对样品发射光谱的影响。结果显示,随Eu^(3+)掺杂量的增大,发光强度先增大后减小。Eu^(3+)掺杂摩尔分数为13%时,出现浓度淬灭,其浓度淬灭机理为电偶极-电偶极相互作用。研究了不同Bi^(3+)掺杂量对Ba_3La_6(SiO_4)_6:Eu^(3+)发射光谱及色坐标的影响。Bi^(3+)掺杂样品中存在Bi^(3+)→Eu^(3+)的能量传递。
A red phosphor Ba_3La_6(SiO_4)_6Eu^(3+) was synthesized via high temperature solid state reaction,and its luminescent characteristics were investigated.According to the analysis by X-ray diffraction,the sample is a pure phase of Ba_3La_6(SiO_4)_6:Eu^(3+).In the excitation spectrum,there are a series of wide bands and peaks located at 300,364,384,395,416 and 466 nm,respectively,and its main peak is located at 395 nm.The phosphor exhibits an intense emission at 619 nm(~5D_0→~7F_2) under 395 nm excitation.The effect of the doping concentration of Eu^(3+) was investigated.The result shows that the luminescent intensity firstly increases and then decreases with the increase of Eu^(3+) concentration,and reaches the maximal value at Eu^(3+) concentration of 13%in mole.The mechanism of concentration quenching is due to the dipole-dipole interaction.In addition,the effect of the doping concentration of Bi^(3+) on the luminescent characteristics and chromaticity coordinates of Ba_3La_6(SiO_4)_6:Eu^(3+)was also investigated.It is indicated that Bi^(3+) can efficiently transfer the excitation energy to Eu^(3+).
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2015年第4期465-470,共6页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金项目(51202053)
河北省自然科学基金项目(Q2012061)资助
关键词
荧光粉
红光
铕离子
光致发光
硅酸钡镧
phosphor
red-emitting
europium ion
photoluminescence
lanthanum barium silicate
