Ca8 MgY（PO4）7∶Re3+（Re3+=Eu3+,Ce3+,Tb3+）发光材料的合成及发光性能研究

摘要

采用固相法成功合成了具有β-Ca3(PO4)2结构的发光材料 Ca8 MgY (PO4)7∶Re3+(Re3+=Eu3+,Ce3+,Tb3+)。XRD、FT-IR 及 TG-DSC 的测试结果表明,该发光材料的最佳烧结温度为1200℃。PL测试结果表明,在252 nm 紫外光激发下,Ca8 MgY (PO4)7∶Eu3+呈现 Eu3+的特征发射,其中以位于612 nm红光发射为主(5 D0-7 F2),Eu3+的最佳掺杂浓度为5.0%(摩尔分数)。在295 nm 紫外光激发下, Ce3+激活的Ca8MgY(PO4)7由峰值位于363 nm的带状5d1-4f1发射为主,Ce3+的最佳掺杂浓度为1.0%(摩尔分数)。在228 nm紫外光激发下,低掺杂浓度的Ca8 MgY(PO4)7∶Tb3+以位于5 D3-7 FJ 的蓝光发射为主,高掺杂浓度的 Ca8MgY(PO4)7∶Tb3+以5D4-7FJ绿光发射为主,这是由于 Tb3+的交叉弛豫造成的。Tb3+的最佳掺杂浓度为7.0%(摩尔分数)。%β-Ca3 (PO4 )2 structured Ca8 MgY(PO4 )7∶Re3+(Re3+=Eu3+,Ce3+,Tb3+)has been prepared by solid state method.The results of XRD,FT-IR,and TG-DSC characterization indicated that the optimum synthesis temperature was at 1 200 ℃.PL characterization indicated that under 252 nm ultraviolet irradiation,Ca8 MgY (PO4)7∶Eu3+ phosphor showed the characteristic emission of Eu3+,dominated by the emission at 612 nm, which was ascribed to 5 D0-7 F2 transition of Eu3+,the optimum doping concentration of Eu3+ was 5.0mol%. Under 295 nm ultraviolet irradiation,Ca8MgY(PO4)7∶Ce3+ phosphor showed a band emission with maximum at 363 nm,which was originated from 5d1-4f1 transition of Ce3+,the optimum doping concentration of Ce3+ was 1.0mol%.Under the irradiation of ultraviolet at 228 nm,the emission of Ca8MgY(PO4)7∶Tb3+ was dominated by blue emission ascribed to 5 D3-7 FJ at lower doping concentration,while at higher concentration,the emission was dominated by green emission ascribed to 5 D4-7 FJ .This phenomenon was due to the crossing-relaxation of Tb3+.The optimum doping concentration of Tb3+ was 7.0mol%.