effect of the aluminum source on the formation of yttrium aluminum garnet (yag) powder via solid...
DESCRIPTION
In this research, the author try to improve the diffusion of Al 3+ in Y 2 O 3 lattice. So the author uses different aluminum sources, such as α-Al 2 O 3 、 θ-Al 2 O 3 、 γ-Al 2 O 3 and boehmite to produce YAG powders by solid state reaction method. Other methods of synthesizing YAG powders, such as : Hydrothermal synthesis method Co-precipitation method Spray pyrolysis method Sol–gel method Methods of producing YAG powders 3TRANSCRIPT
Effect of the aluminum source on the formation of yttrium aluminum garnet (YAG) powder via solid state reaction
Reporter : Che-Wei KuoAdviser : Ming-Shyong Tsai
Date : 2011/010/261
Yttrum aluminum garnet (YAG) are potential phosphor candidates and applications include : Cathode-ray tubes (CRT) Field–emission display (FED) Vacuum-fluorescent display (VFD) Light-emitting diode (LED)
Applications of YAG
2
In this research, the author try to improve the diffusion of Al3+ in Y2O3 lattice. So the author uses different aluminum sources, such as α-Al2O3 、 θ-Al2O3 、 γ-Al2O3
and boehmite to produce YAG powders by solid state reaction method.
Other methods of synthesizing YAG powders , such as :• Hydrothermal synthesis method• Co-precipitation method• Spray pyrolysis method• Sol–gel method
Methods of producing YAG powders
3
Pure YAG powder can be formed successfully and easily by using boehmite as the aluminum source and calcining at 1500 ◦C for 5 h.
The composition diffusion occurs before the phase formation of YAG. The grain growth of Y2O3 and α-Al2O3 are effectively suppressed in this case.
The Y2O3 is decomposed by the diffusion of boehmite that can be observed from the TEM morphology.
Conclusions
4