College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People's Republic of China.
J Phys Condens Matter. 2010 Jun 16;22(23):235402. doi: 10.1088/0953-8984/22/23/235402. Epub 2010 May 26.
An Eu(2+)-doped LiMgPO(4) phosphor was prepared by a high temperature solid-state reaction. The formation was confirmed by x-ray powder diffraction measurements to be a single LiMgPO(4) phase. The photoluminescence excitation and emission spectra were investigated. The luminescence shows a broad emission from the 4f(6)5d → 4f(7)(8)S7/2) transition at room temperature. At low temperature the zero-phonon line for transitions to the 4f(7) ((8)S(7/2)) level of the 4f(6)(7)Fj)5d1 excited state is observed at 360 nm and it is found that the emission line of the 4f(7)(6)P7/2) → 4f(7)(8)S7/2) transition overlaps the zero-phonon line at nearly the same position of 360 nm. The influences of temperature on the luminescence spectra and decay times were investigated. The doping mechanism of Eu(2+) ions in LiMgPO(4) was discussed. The Eu(2+) ions were suggested to occupy the Li(+) sites in LiMgPO(4) to induce the small crystal field splitting and weak nephelauxetic effect.
采用高温固相法制备了 Eu(2+)掺杂的 LiMgPO(4)荧光粉。通过 X 射线粉末衍射测量证实其为单相 LiMgPO(4)。研究了光致发光激发和发射光谱。室温下，从 4f(6)5d→4f(7)(8)S7/2)跃迁发出宽发射。在低温下，观察到跃迁到 4f(6)(7)Fj)5d1激发态的 4f(7)(8)S(7/2))能级的零声子线在 360nm 处，并且发现 4f(7)(6)P7/2)→4f(7)(8)S7/2)跃迁的发射线在几乎相同的 360nm 位置与零声子线重叠。研究了温度对发光光谱和衰减时间的影响。讨论了 Eu(2+)离子在 LiMgPO(4)中的掺杂机制。Eu(2+)离子被认为占据 LiMgPO(4)中的 Li(+)位，导致小的晶场分裂和弱的反铁磁效应。
