A potential green-emitting phosphor Ca_8Mg(Si0_4)_4Cl_2:Eu~(2+) for white light emitting diodes prepared by sol-gel method

摘要

A potential green emitting phosphor Ca_8Mg(Si0_4)_4Cl_2:Eu~(2+) was prepared by modified sol-gel method. The factors those affect the photoluminescence intensity including heating temperature, the usage of the chlorine source CaCl_2 and the concentration of dopant Eu~(2+) were also investigated in detail. As comparison, the phosphor prepared by solid-state reaction was also prepared. The phosphors show intense absorption in the range of 375-450 nm, which makes it a potential candidate of green emitting phosphor used for near-UV or blue light excited white LEDs.