采用化学共沉淀法合成了Bi3+掺杂的YAG∶Eu3+荧光粉，利用DTA-TGA、XRD分析煅烧过程中前驱体的热效应和YAG晶相的形成过程，并通过XRD、SEM、PL表征不同Bi3+含量的YAG∶Eu3+荧光粉结构、形貌及光致发光性能.结果表明：前驱体在煅烧温度1000℃及以上时，可形成纯相的YAG晶相；Bi3+对Eu3+具有敏化作用，Bi3+的掺入使YAG∶Eu3+荧光粉的光致发光峰强度显著增强，当Bi3+含量为0.0010时, 其发光峰强度达到最大值，其后随着Bi3+含量进一步增加，则因浓度猝灭而导致荧光粉发光峰强度降低；掺入Bi3+对YAG∶Eu3+荧光粉晶胞参数有一定的影响，但不会改变其晶体结构；Bi3+掺杂的YAG∶Eu3+荧光粉均匀、无团聚，呈类球型.
Spherical-like (Y,Bi)AG∶Eu3+ red phosphor powders with good photoluminescence performance were synthesized by chemical coprecipitation method. By using DTA-TGA and XRD, both the thermal decomposition and phase formation of (Y,Bi)AG∶Eu3+ precursors were investigated in process of calcination. The crystal structures, surface morphology and luminescence properties of the phosphors with different Bi3+ contents were characterized by means of XRD, SEM and fluorescence spectrometer. The result shows that the pure YAG crystal phase is formed after calcination at 1000℃ or above. The photoluminescence intensity of YAG∶Eu3+ red phosphor strengthens with increasing Bi3+ content due to the sensitizing of Bi3+ to Eu3+，but decreases by excessive Bi3+ ions. When the Bi3+ content is 0.0010, the photoluminescence intensity reaches the highest. Addition of Bi3+ cannot change the crystal structure of YAG∶Eu3+ phosphor, which is garnet with a little different lattice parameter. The particles of (Y,Bi)AG∶Eu3+ red phosphor are spherical-like shapes, narrow size distributions with no aggregation.
参考文献
| [1] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%