Abstract: Synthetic crystals are the basic electronic and photonic materials.This paper reviews the development of synthetic crystals in the fields of electronic,opto-electronic and photonic materials with respect to the progress of IT.In new century(Tera-Era)the central role of single crystals is and will almost certainly continue to be in global IT.

Key words: Synthetic crystals are the basic electronic and photonic materials.This paper reviews the development of synthetic crystals in the fields of electronic,opto-electronic and photonic materials with respect to the progress of IT.In new century(Tera-Era)the central role of single crystals is and will almost certainly continue to be in global IT.