State key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
Chemphyschem. 2012 Oct 8;13(14):3383-7. doi: 10.1002/cphc.201200223. Epub 2012 Jul 16.
A series of the solid-solution phosphors Lu(3-x-y)Mn(x)Al(5-x)Si(x)O(12):yCe(3+) is synthesized by solid-state reaction. The obtained phosphors possess the garnet structure and exhibit similar excitation properties as the phosphor Lu(3)Al(5)O(12):Ce(3+), but with an effectively improved red component in the emission spectrum. This can be attributed to the energy transfer from Ce(3+) to Mn(2+). Our investigation reveals that electric dipole-quadrupole interactions dominate the energy-transfer mechanism and that the critical distance determined by the spectral overlap method is about 9.21 Å. The color-tunable emissions of the Lu(3-x-y)Mn(x)Al(5-x)Si(x)O(12):yCe(3+) phosphor as a function of Mn(3)Al(2)Si(3)O(12) content are realized by continuously shifting the chromaticity coordinates from (0.354, 0.570) to (0.462, 0.494). They indicate that the obtained material may have potential application as a blue radiation-converting phosphor for white LEDs with high-quality white light.
通过固相反应合成了一系列固溶荧光粉 Lu(3-x-y)Mn(x)Al(5-x)Si(x)O(12):yCe(3+)。所得荧光粉具有石榴石结构，表现出与荧光粉 Lu(3)Al(5)O(12):Ce(3+)相似的激发特性，但发射光谱中的红色成分得到有效改善。这可以归因于 Ce(3+)到 Mn(2+)的能量转移。我们的研究表明，电偶极-四极相互作用主导了能量转移机制，而光谱重叠方法确定的临界距离约为 9.21 Å。通过连续调整 Mn(3)Al(2)Si(3)O(12)含量，Lu(3-x-y)Mn(x)Al(5-x)Si(x)O(12):yCe(3+)荧光粉的可调发射色坐标从(0.354, 0.570)连续移动到(0.462, 0.494)。这表明所获得的材料可能具有作为高质量白光 LED 的蓝色辐射转换荧光粉的潜在应用。
