Synthesis and Luminescent Characteristics of CaGa2S4: Eu2+ Yellow Phosphor for Light Emitting Diode

The thiogallate phosphors which are well known for phosphors material for CRT or EL device were reported that have high luminescent properties at long-wavelength region. Among these phosphors, the samples with divalent europium doped CaGa2S4 were prepared by simple process under the reduction atmosphere (5% H-2/ 95% N-2) without toxic gas such as H2S or CS2. The prepared phosphor shows a higher luminescent efficiency (about 120%) than that of YAG: Ce3+ phosphor. Consequently, this phosphor is possible to be applicable to white LED lamp because of the high luminescent efficiency.