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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 Kuo
Adviser : Ming-Shyong Tsai
Date : 2011/010/26
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Applications of YAG
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)
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Methods of producing YAG powders
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 :
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Hydrothermal synthesis method
Co-precipitation method
Spray pyrolysis method
Sol–gel method
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Conclusions
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 αAl2O3 are effectively suppressed in this case.
The Y2O3 is decomposed by the diffusion of boehmite
that can be observed from the TEM morphology.
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