The principle of white LED & LD is by casting blue ray on the yellow phosphor material Ce:YAG（Y3Al5O12:Ce3+）, and then combining the converted yellow and remaining blue light to obtain white light.
As the power of LED & LD increases, more heat is generated. Ce:YAG single crystal has a higher thermal conductivity than glass or ceramic phosphors and can withstand higher temperatures.
Ce:YAG single crystal is grown by the Czochralski method, which can be doped with different Ce concentrations according to customer requirement.
