摘要
采用高温固相反应法制备了一系列白光LED用CaSi2O2N2:0.05Eu2+,xDy3+,xLi+(0≤x≤0.03)荧光粉.利用X射线衍射仪对样品的物相结构进行了分析,结果表明:Dy3+和Li+离子的掺入没有改变CaSi2O2N2:Eu2+荧光粉的主晶相.利用荧光光谱仪对样品的发光性能进行了测试,发现所有样品的激发光谱均覆盖了从近紫外到蓝光的较宽范围,400 nm激发下得到的发射光谱为宽波段的单峰,峰值位于545 nm左右,是Eu2+离子5d-4f电子跃迁引起的.Dy3+离子掺杂可以提高CaSi2O2N2:Eu2+荧光粉的发光强度,Dy3+与Li+共掺杂可进一步提高荧光粉的发光强度,当Dy3+和Li+的掺杂量为1mol%时,荧光粉的发光强度达到最大值,是单掺杂Eu2+的荧光粉发光强度的157%.
A series of CaSi2 O2N2： 0.05Eu2＋,xDy3＋,xLi＋（0≤x≤0.03） phosphors were prepared through high-temperature solid-state reaction method.The phosphors were characterized by X-ray diffraciton（XRD） and fluorescence spectrophotometer（PL）.XRD patterns revealed that the samples maintained CaSi2O2N2 single phase after doping Dy3＋ or Li＋ ions.The PL results showed that the excitation spectra of samples were all located in the UV to blue spectral region.The emission spectra for 400 nm excitation showed the typical broad band of Eu2＋ peaking at about 545 nm（5d-4f）.In addition,the emission intensity could be greatly enhanced through doping Dy3＋ in CaSi2O2N2：Eu2＋ phosphors.Furthermore,the effect of the Li＋ doping was studied.Li＋ ions could be used as charge compensation in CaSi2O2N2：Eu2＋,Dy3＋ phosphors.Thus the doping of Li＋ ions could further improve the emission intensity of CaSi2O2N2：Eu2＋,Dy3＋ phosphor.When the doping concentrations of Dy3＋ and Li＋ were 1mol%,the emission intensity reached a maximum,which was about 157% of that of the sample without doping Dy3＋ or Li＋.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第10期1095-1098,共4页
Journal of Inorganic Materials
基金
国家自然科学基金(51072034
51172042)
教育部科技创新工程重大项目培育资助项目(708039)~~
