Eu^(2+)激活的黄橙光荧光粉的制备及发光性能调控

Preparation and Luminescent Properties Regulation of Eu^(2+)-Activated Yellow-Orange Emitting Phosphors

采用高温固相法制备了一系列黄橙光荧光粉Sr_(9)Mg_(1.5)(PO_(4))_(7-x)(BO_(3))_(x):0.05Eu^(2+)(SMPB_(x)O:Eu^(2+),x=0~0.6)和Sr_(9-2 y)Ca_(y)Ba_(y)Mg_(1.5)(PO_(4))_(7):0.05Eu^(2+)(SC_(y)B_(y)MPO:Eu^(2+),y=0~1.0),并对其发光性能的调控进行了研究。所得荧光粉可以被蓝光和近紫外光有效激发,并发射黄橙光(450~800 nm)。随着(BO_(3))^(3-)与Ca^(2+)-Ba^(2+)共掺浓度的改变,可以调节Eu^(2+)发光中心在Sr31、Sr1和Sr32格位中的选择性占据,从而改变SMPB_(x)O:Eu^(2+)和SC y B y MPO:Eu^(2+)的发射光谱。因此,固定激发波长,改变(BO_(3))3-或Ca^(2+)-Ba^(2+)共掺浓度可以实现对SMPB_(x)O:Eu^(2+)(x=0.2~0.6)和SC_(y)B_(y)MPO:Eu^(2+)(y=0.25~1.0)发光颜色的调控。另外,SMPB_(x)O:Eu^(2+)和SC_(y)B_(y)MPO:Eu^(2+)的发光颜色也可以通过改变激发波长来进行调控。此外,(BO_(3))^(3-)掺杂与Ca^(2+)-Ba^(2+)共掺均可以明显提高荧光粉的热稳定性。在100℃下,SMPB_(x)O:Eu^(2+)(x=0.2~0.6)和SC_(y)B_(y)MPO:Eu^(2+)(y=0.25~1.0)样品的发光强度均可达到其各自初始强度的60%以上。

A series of yellow-orange emitting phosphors Sr_(9)Mg_(1.5)(PO_(4))_(7-x)(BO_(3))_(x):0.05Eu^(2+)(SMPB_(x)O:Eu^(2+),x=0~0.6)and Sr_(9-2 y)Ca_(y)Ba_(y)Mg_(1.5)(PO_(4))_(7):0.05Eu^(2+)(SC_(y)B_(y)MPO:Eu^(2+),y=0~1.0)were prepared by high temperature solid state method.And their luminescent properties were studied in detail.The phosphors can be effectively excited by blue light and near-ultraviolet light,and emit yellow-orange emission(450~800 nm).With doping of(BO_(3))3-or Ca^(2+)-Ba^(2+),the selective occupation of Eu^(2+)-emitting centers in Sr31,Sr1 and Sr32 sites can be adjusted.Thus,the emission spectra shape of SMPB_(x)O:Eu^(2+)and SC y B y MPO:Eu^(2+)can be changed.Accordingly,the emission color of SMPB_(x)O:Eu^(2+)(x=0~0.6)and SC_(y)B_(y)MPO:Eu^(2+)(y=0.25~1.0)can be regulated by fixing the excitation wavelength and changing the doping concentration of(BO_(3))^(3-)or Ca^(2+)-Ba^(2+).Also,the emission colors of SMPB_(x)O:Eu^(2+)and SC_(y)B_(y)MPO:Eu^(2+)can also be adjusted by changing the excitation wavelengths.In addition,(BO_(3))^(3-)or Ca^(2+)-Ba^(2+)doping can improve the thermal stability of phosphors obviously.When the temperature reaches 100℃,the luminescence intensities of SMPB_(x)O:Eu^(2+)(x=0.2~0.6)and SC y B y MPO:Eu^(2+)(y=0.25~1.0)can keep more than 60%of their respective initial intensities.