Structure and photoluminescence properties of Ce3+-doped novel silicon-oxynitride Ba4-zMzSi8O20-3xN2x (M=Mg, Ca, Sr)
Structure and photoluminescence properties of Ce3+-doped novel silicon-oxynitride Ba4-zMzSi8O20-3xN2x (M=Mg, Ca, Sr)
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Ce3掺杂新型氮氧化硅Ba4-zMzSi8O20-3xN2x (M=Mg, Ca, Sr)的结构和光致发光性能
DOI：
10.1016/j.jssc.2011.03.048
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发表时间：
2011
影响因子：
3.3
通讯作者：
T. Qiu
中科院分区：
文献类型：
--
作者：
Y. Fang ;Y.Q. Li;R.J. Xie;N. Hirosaki;T. Takade;X.Y. Li;T. Qiu
报道了新型氮氧化硅荧光粉Ba 4 − zMzSi 8 O20 − 3xN 2x（M=Mg，Sr，Ca）的结构和光致发光特性。通过3 O2 −→ 2N 3 −和Ba→M（M=Mg，Ca，Sr）部分取代正交晶系Ba 2Si 4 O 10，合成了单相Ba 4 − zMzSi 8 O20 − 3xN 2x氮氧化物固溶体。研究了碱土金属离子M的种类、Ce 3+的浓度对Ba 3 MSi 8 O20 - 3xN 2x（M=Mg，Ca，Sr，x=0.5）发光性能和热猝灭行为的影响。在330 nm激发下，Ba 3 MSi 8 O20 - 3xN 2x：Ce 3+（x=0.5）在350-650 nm范围内，由于Ce 3+的5d→ 4f跃迁，在400-450 nm处呈现出高效的蓝光发射。由于晶场的改变，M的离子尺寸增大，Ce ~（3+）离子的Stokes位移和能量转移或重吸收，使Ce ~（3+）离子的浓度增加，从而使Ce ~（3+）的发射带向长波方向移动。在Ba_3MSi_8O_（18.5）N：Ce ~（3+）的氮氧化硅荧光粉中，M= Sr_（0.6）Ca_（0.4）具有最好的热稳定性，这可能与其具有较高的Ce ~（3+）吸收边有关。
Structural and photoluminescence properties of undoped and Ce3+-doped novel silicon-oxynitride phosphors of Ba4−zMzSi8O20−3xN2x(M=Mg, Sr, Ca) are reported. Single-phase solid solutions of Ba4−zMzSi8O20−3xN2xoxynitride were synthesized by partial substitutions of 3O2−→2N3−and Ba→M(M=Mg, Ca, Sr) in orthorhombic Ba2Si4O10. The influences of the type of alkaline earth ions ofM, the Ce3+concentration on the photoluminescence properties and thermal quenching behaviors of Ba3MSi8O20−3xN2x(M=Mg, Ca, Sr,x=0.5) were investigated. Under excitation at about 330 nm, Ba3MSi8O20−3xN2x:Ce3+(x=0.5) exhibits efficient blue emission centered at 400–450 nm in the range of 350–650 nm owing to the 5d→4ftransition of Ce3+. The emission band of Ce3+shifts to long wavelength by increasing the ionic size ofMdue to the modification of the crystal field, as well as the Ce3+concentrations due to the Stokes shift and energy transfer or reabsorption of Ce3+ions. Among the silicon-oxynitride phosphors of Ba3MSi8O18.5N:Ce3+,M=Sr0.6Ca0.4possesses the best thermal stability probably related to its high onset of the absorption edge of Ce3+.