Cao Renping, Chen Kangbin, Liu Pan, Cao Chunyan, Xu Yongchun, Ao Hui, Tang Pengjie
College of Mathematics and Physics, Jinggangshan University, Ji'an, 343009, China.
Scientific Research Office, Jinggangshan University, Ji'an, 343009, China.
Luminescence. 2015 Nov;30(7):962-6. doi: 10.1002/bio.2845. Epub 2015 Jan 21.
A series of Sr(1-x-y)CayMoO4:xSm(3+) (0 ≤ x ≤ 7 mol% and 0 ≤ y < 1) phosphors was synthesized by a conventional solid-state reaction method in air, and their structural and spectroscopic properties were investigated. The optimal doping concentration of Sm(3+) in SrMoO4:Sm(3+) phosphor is 5 mol%. Under excitation with 275 nm, in Sr(1-x-y)CayMoO4:xSm(3+) (0 ≤ x ≤ 7 mol% and 0 ≤ y < 1) phosphors, the emission band of the host was found to overlap with the excitation bands peaking at ~ 500 nm of Sm(3+) ion, and the energy transfer from MoO4 (2-) group to Sm(3+) ion can also be observed. The International Commission on Illumination (CIE) chromaticity coordinates of Sr(0.95-y)CayMoO4:0.05Sm(3+) phosphors with excitation 275 nm varied systematically from an orange (0.4961, 0.3761) (y = 0) to a white color (0.33, 0.3442) (y = 0.95) with increasing calcium oxide (CaO) concentration. However, Sr(0.95-y)CayMoO4:0.05Sm(3+) phosphors with excitation at 404 nm only showed red emission and the energy transfer between MoO4(2-) group to Sm(3+) ion was not observed. The complex mechanisms of luminescence and energy transfer are discussed by energy level diagrams of MoO4(2-) group and Sm(3+) ion.
采用传统的固相反应法在空气中合成了一系列Sr(1-x-y)CayMoO4:xSm(3+)（0 ≤ x ≤ 7 mol%且0 ≤ y < 1）荧光粉，并对其结构和光谱性质进行了研究。SrMoO4:Sm(3+)荧光粉中Sm(3+)的最佳掺杂浓度为5 mol%。在275 nm激发下，发现Sr(1-x-y)CayMoO4:xSm(3+)（0 ≤ x ≤ 7 mol%且0 ≤ y < 1）荧光粉中基质的发射带与Sm(3+)离子在~500 nm处的激发带重叠，并且还能观察到从MoO4 (2-)基团到Sm(3+)离子的能量转移。激发波长为275 nm时，Sr(0.95-y)CayMoO4:0.05Sm(3+)荧光粉的国际照明委员会（CIE）色度坐标随着氧化钙（CaO）浓度的增加从橙色（0.4961, 0.3761）（y = 0）系统地变化到白色（0.33, 0.3442）（y = 0.95）。然而，激发波长为404 nm时，Sr(0.95-y)CayMoO4:0.05Sm(3+)荧光粉仅显示红色发射，未观察到MoO4(2-)基团与Sm(3+)离子之间的能量转移。通过MoO4(2-)基团和Sm(3+)离子的能级图讨论了发光和能量转移的复杂机制。
