9:30 AM - 9:45 AM
[21a-E302-3] Effect of cation atomic ratio on the photoluminescence properties of Eu2+-activated orthosilicate phosphors prepared by solution techniques
Keywords:phosphor, photoluminescence
Orthosilicates [M2SiO4 (M = Ba, Sr, Ca)] with high Eu2+ concentrations show the strong green, orange and red emissions under blue light region. It is expected that aqueous solution process leads to the synthesis of high-pure phosphors with excellent photoluminescence (PL) properties. In this study, Eu2+-activated M2SiO4 (M = Ba, Sr, Ca) phosphors were prepared by amorphous metal complex (AMC) method using propylene glycol modified silane (PGMS) as Si source and the relationship between PL properties and Si concentration in these phosphors was investigated in detail. PL properties of Eu2+-activated M2SiO4 (M = Ba, Sr, Ca) phosphors were sensitively changed by nominal Si concentration. Especially, PL intensity of the phosphors with nominal Si concentration at higher than chemical stoichiometric composition (1.00) were drastically deteriorated. These results indicate that PL properties of these phosphors are strongly affected by nominal Si concentration.