State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Science , Changchun 130022, P. R. China.
Inorg Chem. 2013 Sep 16;52(18):10340-6. doi: 10.1021/ic401033u. Epub 2013 Aug 30.
A series of Eu(2+) and Eu(2+)/Tb(3+) activated novel Ba3LaNa(PO4)3F phosphors have been synthesized by traditional solid state reaction. Rietveld structure refinement of the obtained phosphor indicates that the Ba3LaNa(PO4)3F host contains three kinds of Ba sites. The photoluminescence properties exhibit that the obtained phosphors can be efficiently excited in the range from 320 to 430 nm, which matches perfectly with the commercial n-UV LED chips. The critical distance of the Eu(2+) ions in Ba3LaNa(PO4)3F:Eu(2+) is calculated and the energy quenching mechanism is proven to be dipole-dipole interaction. Tunable blue-green emitting Ba3LaNa(PO4)3F:Eu(2+),Tb(3+) phosphor has been obtained by co-doping Eu(2+) and Tb(3+) ions into the host and varying their relative ratios. Compared with the Tb(3+) singly doped phosphor, the codoped phosphors have more intense absorption in the n-UV range and stronger emission of the Tb(3+) ions, which are attributed to the effective energy transfer from the Eu(2+) to Tb(3+) ions. The energy transfer from the Eu(2+) to Tb(3+) ions is demonstrated to be a dipole-quadrupole mechanism by the Inokuti-Hirayama (I-H) model. The Eu(2+) and Tb(3+) activated phosphor may be good candidates for blue-green components in n-UV white LEDs.
一系列 Eu(2+) 和 Eu(2+)/Tb(3+) 激活的新型 Ba3LaNa(PO4)3F 荧光粉通过传统的固态反应合成。所得荧光粉的 Rietveld 结构精修表明，Ba3LaNa(PO4)3F 基质包含三种 Ba 位。光致发光性能表明，所得荧光粉可以在 320 到 430nm 的范围内有效激发，与商用 n-UV LED 芯片完美匹配。计算了 Ba3LaNa(PO4)3F:Eu(2+)中 Eu(2+)离子的临界距离，并证明能量猝灭机制是偶极-偶极相互作用。通过共掺杂 Eu(2+)和 Tb(3+)离子到基质中并改变它们的相对比例，获得了可调谐的蓝绿色发射 Ba3LaNa(PO4)3F:Eu(2+)、Tb(3+)荧光粉。与 Tb(3+)单掺杂荧光粉相比，共掺杂荧光粉在 n-UV 范围内具有更强的吸收和更强的 Tb(3+)离子发射，这归因于 Eu(2+)到 Tb(3+)离子的有效能量转移。通过 Inokuti-Hirayama（I-H）模型证明，Eu(2+)到 Tb(3+)离子的能量转移是偶极-四极机制。Eu(2+)和 Tb(3+)激活的荧光粉可能是 n-UV 白光 LED 中蓝绿色组件的良好候选材料。
