摘要
采用高温固相法合成了具有高热稳定性的Ca2Y8(SiO4)6O2:Eu^3+红色荧光粉。通过X射线衍射和扫描电子显微镜对样品的结构和形貌进行了系统地表征,结果表明成功地合成了Ca2Y8(SiO4)6O2:Eu^3+荧光粉。在394 nm激发下,样品发出很强的红光,该发射来自于EJ+的5D°→7Fj(J=l,2,3,4)。通过变温光谱分析了样品在303-563 K温度范围的热稳定性。随着温度的升高,Ca2Y8(SiO4)6O2;0.3Eu^3+样品的发光先增强后减弱,在483 K时的发光最强为室温时的1.5倍。将Ca2Yg(SiO4)6O2:0.3Eu^3t样品与蓝色荧光粉BaMgAl10O17:Eu2+和绿色荧光粉BaSiO4:Eu2+以及近紫外LED芯片(395 nm)进行封装,在不同电流激发下(20-140 mA),均获得了显色指数高于92,色温低于4000 K的暖白光。以上结果表明Ca2Y8(SiO4)6O2:Eu^3+在白光LED领域具有非常好的潜在应用。
In this work,Ca2 Y8(SiO4)6O2:Eu^3+red phosphors with high thermal stability were fabricated via high temperature solid state method.The structure and morphology properties of samples were characterized by X-ray diffraction and scanning electron microscopy.Results showed that Ca2Y8(SiO4)6O2:Eu^3+phosphors were successfully fabricated.Under the excitation of 394 nm,these samples exhibited strong red emission that ascribed to 5D°→7Fy(J=1,2,3,4)transitions of Eu^3+.Thermal stability of Ca2Y8(SiO4)6O2:0.3Eu^3+was investigated through temperature dependent spectra.With the increase of temperature,the emission intensity of Ca2Y8(SiO4)6O2:0.3Eu^3+strengthened at first and then decreased.The emission intensity reached the highest at 483 K and was enhanced 1.45 times compared with that at room temperature.A white LED device was developed by coating the mixture of Ca2 Y8(SiO4)6O2:0.3Eu^3+,blue BaMgAl10O17:Eu^2+and green BaSiO4:Eu2+phosphors onto near ultraviolet chip(395 nm).The warm white emitting was achieved under different operating current(20~140 mA).And the color rendering index and correlated color temperature of the packaged white LED device found to be higher than 92 and lower than 4000 K,respectively.These results suggested that the Ca2Y8(SiO4)6O2:Eu^3+phosphors may have po-tential application in the field of white LED.
作者
李振亚
陈雪妍
胡芳芳
魏荣妃
郭海
Li Zhenya;Chen Xueyan;Hu Fangfang;Wei Rongfei;Guo Hai(Department of Physics,Zhejiang Normal University,Jinhua 321004,China)
出处
《中国稀土学报》
CAS
CSCD
北大核心
2019年第5期530-536,I0001,共8页
Journal of the Chinese Society of Rare Earths
基金
浙江省自然科学基金项目(LQ18A040004)
国家自然科学基金项目(11374269)资助
