State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, China.
Dalton Trans. 2012 Mar 14;41(10):3078-86. doi: 10.1039/c2dt12222g. Epub 2012 Jan 27.
Eu(3+) and/or Tb(3+)-doped CaYAlO(4) phosphor samples were synthesized by Pechini-type sol-gel method. X-Ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), photoluminescence (PL) and cathodoluminescence (CL) spectra were used to characterize the samples. For CaYAlO(4):Tb(3+), it is shown that the Tb(3+)-doping concentration has a significant effect on the (5)D(3)/(5)D(4) emission intensity of Tb(3+), which is attributed to the cross relaxation from (5)D(3) to (5)D(4). Under the 4f(8)→ 4f(7)5d excitation of Tb(3+) or low-voltage electron beams excitation, the CaYAlO(4):Tb(3+) phosphors show tunable luminescence from blue to cyan, and then to green with the change of Tb(3+)-doping concentration. The CaYAlO(4):Eu(3+) samples exhibit a reddish-orange emission of Eu(3+) corresponding to (5)D(0,1)→(7)F(0,1,2,3) transitions. Furthermore, a white emission can be realized in the single phase CaYAlO(4) host by reasonably adjusting the doping concentrations of Tb(3+) and Eu(3+) under low-voltage electron beams excitation. Compared with the commercial blue (Y(2)SiO(5):Ce(3+)) and green (ZnO:Zn) phosphors, CaYAlO(4):0.1%Tb(3+) and CaYAlO(4):5%Tb(3+) phosphors have higher CL intensity and stability under continuous electron bombardment. Due to the excellent CL properties and good CIE chromaticity coordinates, the as-prepared Tb(3+)/Eu(3+)-doped CaYAlO(4) nanocrystalline phosphors have potential application in FEDs devices.
采用改进的Pechini 溶胶-凝胶法制备了 Eu(3+)和/或 Tb(3+)掺杂的 CaYAlO(4)荧光粉。采用 X 射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）、荧光光谱（PL）和阴极发光光谱（CL）对样品进行了表征。对于 CaYAlO(4):Tb(3+)，研究表明 Tb(3+)掺杂浓度对 Tb(3+)的(5)D(3)/(5)D(4)发射强度有显著影响，这归因于从(5)D(3)到(5)D(4)的交叉弛豫。在 Tb(3+)的 4f(8)→4f(7)5d 激发或低能电子束激发下，CaYAlO(4):Tb(3+)荧光粉的发光颜色可从蓝色调至蓝绿色，然后随 Tb(3+)掺杂浓度的变化进一步调至绿色。CaYAlO(4):Eu(3+)样品呈现出 Eu(3+)的红橙色发射，对应于(5)D(0,1)→(7)F(0,1,2,3)跃迁。此外，通过在低能电子束激发下合理调整 Tb(3+)和 Eu(3+)的掺杂浓度，可以在单相 CaYAlO(4)基质中实现白色发射。与商用蓝色(Y(2)SiO(5):Ce(3+))和绿色(ZnO:Zn)荧光粉相比，CaYAlO(4):0.1%Tb(3+)和 CaYAlO(4):5%Tb(3+)荧光粉在连续电子束轰击下具有更高的 CL 强度和稳定性。由于具有优异的 CL 性能和良好的 CIE 色度坐标，所制备的 Tb(3+)/Eu(3+)掺杂 CaYAlO(4)纳米晶荧光粉在 FEDs 器件中有潜在的应用。
