Ce^(3+)和Y^(3+)掺杂对Ca_2MgSi_2O_7:Eu^(2+)荧光粉发光性能的影响

The Effect of Co-doping Ce^(3+),Y^(3+) on Photoluminescence Characteristics of Ca_2MgSi_2O_7:Eu^(2+) Phosphors

在还原气氛下,采用高温固相法合成了Ca2MgSi2O7:Eu2+,R3+(R3+=Ce3+,Y3+)系列荧光粉。结果表明,少量稀土离子的掺入没有改变晶体的物相结构。在Ca2MgSi2O7:Eu2+荧光粉中,Ce3+和Y3+的掺入对荧光强度的影响较大,且与掺杂元素、掺杂量相关。当掺杂Ce3+和Y3+的量分别为0.007mol和0.05mol时,所得荧光粉在532nm处的发光强度分别是未掺杂时的127%和117%。结果表明,在Ca2MgSi2O7中Ce3+与Eu2+存在能量传递,Ce3+的加入显著敏化了Eu2+的发光,导致荧光强度的进一步提高;Y3+的掺杂可以使荧光粉的粒径减小,并导致基质中的电荷缺陷而敏化Eu2+发光,从而使荧光强度进一步提高。

Ca2 MgSi2O7 ： Eu^2＋ , R^3＋ （R^3＋ = Ce^3＋ , Y^3＋ ） phosphors are prepared under a reducing atmosphere by solid-state reaction. The results show that co-doping of rare earth ions does not change the crystalline phases of the phosphors. The doping of Ce^3＋ or Y^3＋ can enhance the fluorescence intensity of Ca2MgSi2O7 ： Eu^2＋ phosphors. The fluorescence intensity of as-synthesized phosphors is related to the doping species and amount. When co-doping with 0. 007mol of Ce^3＋ and 0. 05mol of Y^3＋, the phosphors have an intensity of 127% and 117% respectively as high as that of Ca2MgSi2O7 ： Eu^2＋ phosphor. These results show that co-doping with Ce^3＋ can enhance the fluorescence intensity due to the energy transfer process from Ce^3＋ to Eu^2＋ in Ca2MgSi2O7 ： Eu^2＋ , Ce^3＋ phosphors, and that co-doping with the Y^3＋ can increase the fluorescence intensity because of the charge defects resulting from the co-doping Y^3＋ in Ca2MgSi2O7 ： Eu^2＋, Y^3＋ phosphors.