[21a-E302-1~13] 13.8 Optical properties and light-emitting devices

[21a-E302-3] Effect of cation atomic ratio on the photoluminescence properties of Eu²⁺-activated orthosilicate phosphors prepared by solution techniques

〇Yasushi Sato¹, Riko Yasuda¹, Koji Tomita², Toshihiro Okajima³, Masato Kakihana⁴ (1.Okayama Univ. Sci., 2.Tokai Univ., 3.SAGA-LS, 4.Tohoku Univ. IMRAM)

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.