effect of the aluminum source on the formation of yttrium aluminum garnet (yag) powder via solid...
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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
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