Eu<sup>2+</sup>-Activated Alkaline-Earth Halophosphates, M<sub>5</sub>(PO<sub>4</sub>)<sub>3</sub>X:Eu<sup>2+</sup> (M = Ca, Sr, Ba; X = F, Cl, Br) for NUV-LEDs: Site-Selective Crystal Field Effect
作者:Donghyeon Kim、Sung-Chul Kim、Jong-Seong Bae、Sungyun Kim、Seung-Joo Kim、Jung-Chul Park
DOI:10.1021/acs.inorgchem.6b00637
日期:2016.9.6
Eu2+-activated M5(PO4)3X (M = Ca, Sr, Ba; X = F, Cl, Br) compounds providing different alkaline-earth metal and halide ions were successfully synthesized and characterized. The emission peak maxima of the M5(PO4)3Cl:Eu2+ (M = Ca, Sr, Ba) compounds were blue-shifted from Ca to Ba (454 nm for Ca, 444 nm for Sr, and 434 nm for Ba), and those of the Sr5(PO4)3X:Eu2+ (X = F, Cl, Br) compounds were red-shifted along
成功合成并表征了具有不同碱土金属和卤化物离子的Eu 2+活化的M 5(PO 4)3 X(M = Ca,Sr,Ba; X = F,Cl,Br)化合物。将M 5(PO 4)3 Cl:Eu 2+(M = Ca,Sr,Ba)化合物的发射峰最大值从Ca蓝移到Ba(Ca 454 nm,Sr 444 nm和434 nm (对于Ba),以及那些Sr 5(PO 4)3 X:Eu 2+(X = F,Cl,Br)化合物沿着一系列卤化物F→Cl→Br发生红移(F为437 nm,Cl为444 nm,Br为448 nm)。估计M 5(PO 4)3 X:Eu 2+(M = Ca,Sr,Ba; X = F,Cl,Br)晶格中活化剂离子(Eu 2+)的位点选择性和占有率LCAO理论计算Eu 2+的5d→4f跃迁能的理论研究。结合光致发光测量和理论计算,阐明了Eu 2+离子优选进入M 5(PO 4)3 X:Eu 2+中完全与氧配位的位点(M