一种新型Ca3Mg3Si4O14:Eu2+绿色荧光粉的制备及其性能研究

采用CaCO3,MgO,SiO2,Eu2O3原料,通过高温固相法制备了Ca3Mg3Si4O14:Eu2+荧光粉.通过XRD图谱和PL光谱图,研究了Eu的掺杂浓度与助溶剂(NH4Cl,BaF2)对Ca3Mg3Si4O14:Eu2+荧光粉结构、发光性能和热稳定的影响.XRD图谱对比结果表明,制备的Ca3Mg3Si4O14:Eu2+荧光粉XRD图与理论计算得到的图谱几乎一致.Ca3Mg3Si4O14:Eu2+荧光粉在360～450 nm有很强的激发强度,并且在440 nm激发下发射峰值波长为530 nm的发射光.随着Eu2+离子浓度的增加,发射光谱出现了红移,且在Eu2+离子浓度约为6％时发生了浓度猝灭现象.当添加NH4Cl和BaF2作为助溶剂,Ca3Mg3Si4O14:Eu2+荧光粉的发光强度有一定提高.与未添加助溶剂的Ca3Mg3Si4O14:Eu2+荧光粉的发光强度相比,添加NH4Cl助溶剂后发光强度增加了70％.此外,当温度升高至150 ℃时,Ca3Mg3Si4O14:Eu2+荧光粉和商用绿色荧光粉的发光强度分别降低了7.6％和14％,表明Ca3Mg3Si4O14:Eu2+荧光粉具有良好的热稳定性.这些发光性能均表明Ca3Mg3Si4O14:Eu2+荧光粉是是一种可应用于固态照明的有前景的绿色荧光粉.

Preparation and Luminescence Properties of a New GreenEmitting Ca3Mg3Si4O14:Eu2+ Phosphor

Green light-emitting Ca3Mg3Si4O14:Eu2+ phosphors were prepared by solid-state reaction using CaCO3,MgO,SiO2 and Eu2O3 as raw materials.The effects of Eu-doping concentration and fluxes(NH4Cl,BaF2)on the crystal structure,luminescence property,and thermal stability of phosphor were studied,which were characterizes by X-ray diffraction(XRD),and photoluminescence(PL)spectra,respectively.The XRD results show that the crystal structure of Ca3Mg3Si4O14:Eu2+ is consistent with the calculated patterns,which investigated the crystal structure of the compound Ca3Mg3Si4O14:Eu2+.The phosphor has strong excitation around 360～450 nm and exhibits a broad emission band with a maximum at 530 nm under 440 nm excitation.With the increase of Eu2+ concentration,the phosphor shows a red-shift and the quenching concentration of Eu2+ is about 6％.With the introduction of NH4Cl and BaF2 as fluxes,the luminous intensity of Ca3Mg3Si4O14:Eu2+ phosphor has been improved.Compared with the luminescence intensity of Ca3Mg3Si4O14:Eu2+phosphor without flux,the photoluminescence intensity increased by 70％when adding NH4Cl as flux.Furthermore,the emission intensity reduced by only 7.6％and 14％at 150 ℃ for Ca3Mg3Si4O14:Eu2+ phosphor and commercial green phosphor.The Ca3Mg3Si4O14:Eu2+ phosphor also possesses high thermal stability,and these luminescnce properties indicate that Ca3Mg3Si4O14:Eu2+ phosphor is a promising green phosphor for use in solid-state white lighting.