Yttrium is one of the most important rare-earth elements. Yttrium compounds show promise for applications such as high quality phosphors, catalysts, up-conversion materials and fine ceramics because of their optical, catalytic properties and high-temperature stability. Yttrium oxide is the most familiar yttrium compound, which is popularly known as host for ion doping of other rare earth elements. For example, europium doped yttrium oxide, Y