State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China.
Inorg Chem. 2010 Dec 6;49(23):10907-13. doi: 10.1021/ic101749g. Epub 2010 Nov 2.
A novel white-light-emitting phosphor Ca(9)Lu(PO(4))(7):Eu(2+),Mn(2+) has been prepared by solid-state reaction. The photoluminescence properties indicate that there is an efficient energy transfer from the Eu(2+) to Mn(2+) ions via a dipole-quadrupole reaction. The obtained phosphor exhibits a strong excitation band between 250 and 430 nm, matching well with the dominant emission band of a UV light-emitting-diode (LED) chip. Upon excitation of UV light, white light is realized by combining a broad blue-green emission band at 480 nm and a red emission band at 645 nm attributed to the Eu(2+) and Mn(2+) ions. The energy-transfer efficiency and critical distance were also calculated. Furthermore, the phosphors can generate lights from blue-green through white and eventually to red by properly tuning the relative ratio of the Eu(2+) to Mn(2+) ions through the principle of energy transfer. Preliminary studies showed that the phosphor might be promising as a single-phased white-light-emitting phosphor for a UV white-light LED.
一种新型的白光发光材料 Ca(9)Lu(PO(4))(7):Eu(2+),Mn(2+) 通过固态反应合成。光致发光性能表明，Eu(2+)和 Mn(2+)离子之间存在有效的能量转移，通过偶极-四极相互作用实现。所得荧光粉在 250nm 至 430nm 之间表现出强激发带，与 UV 发光二极管（LED）芯片的主要发射带很好地匹配。在紫外光激发下，通过组合 480nm 的宽蓝绿色发射带和 645nm 的红色发射带，实现了由 Eu(2+)和 Mn(2+)离子产生的白光。还计算了能量传递效率和临界距离。此外，通过能量传递原理，通过适当调整 Eu(2+)与 Mn(2+)离子的相对比例，荧光粉可以从蓝绿色产生光，通过白色最终产生红色，从而产生各种颜色的光。初步研究表明，该荧光粉可能是一种有前途的单相白光发光材料，适用于 UV 白光 LED。
