摘要
高温固相扩散方法首次合成了Zn4 B6 O1 3:Ce3+ ,Tb3+ 光致发光材料。通过XRD分析获得晶胞参数 :a =0 7472nm ,V =0 .4172nm3,为立方晶系。研究Ce3+ 和Ce3+ ,Tb3+ 在Zn4 B6 O1 3中的激发和发射光谱 ,发现Ce3+ 在Zn4 B6 O1 3中的激发和发射带比Ce3+ 在其他基质中红移2 3 8～ 4.94KK ,Ce3+ 的发射带与Tb3+ 的 7F6 → 5G2 ,5D1 ,5H7吸收带有很好的重叠 ,使Ce3+ 对Tb3+ 有良好的敏化作用。Ce3+ ,Tb3+ 在基质中的能量传递机理为 :Ce3+ →Ce3+ 和Ce3+ →Tb3+ 之间的偶极子—偶极子的电多级相互作用的共振传递机理。色坐标为 :x =0 2 81,y =0 .619。SEM摄取产物的晶貌 ,颗粒均匀 ,平均粒度为 0 .2 3 μm ,接近纳米级。
The green photoluminescence material Zn 4B 6O 13 ∶Ce 3+ , Tb 3+ was synthesized by high temperature solid state diffusion for the first time. Its structurs was investigated by XRD to be cubic crystal system with lattice parameters of a 0= 0.7472 nm, V =0.4172 nm 3. The samples which synthesized at different emperatures: 800, 860, 900, 940 ℃ were analyzed by XRD. The result shows that the compound synthesized at 900 ℃ under reducing atmosphere is of high quality. When Ce 3+ was doped singly, the strong excitation band of Ce 3+ at 235～410 nm are originated from 4f 5d absorption transition, and the emission band of Ce 3+ at 435 nm resulted in the 5d -7 F J(J=7/2,5/2) transition. It is found that the excitation and emission band of Ce 3+ doped singly in Zn 4B 6O 13 red shift about 2.38～4.94 kk than those in other matrices. This result maybe related to the distance between Ce, O and Zn. When Ce 3+ and Tb 3+ were co doped, the emission band of Ce 3+ even could hardly be observed and the luminescence intensity of Tb 3+ is increased much than that Tb doped singly. This shows that the emission of Tb 3+ is sensitized by Ce 3+ . The experimental results indicate that there exists an effective energy transfer from Ce 3+ to Tb 3+ in Zn 4B 6O 13 host. The experimental results indicate that electrical multipolar interaction is the predominant mechanism for the energy transfer. Adding flux can increase crystallinity and relative luminous intensity by 30 %. The product has color coordinate x =0.281, y =0.619 and the crystal size is about 0.23 μm.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2002年第3期222-226,共5页
Journal of the Chinese Society of Rare Earths
基金
吉林省科委基金资助项目 (990 5 5 0 )
