M8MgSc(PO4)7:xDy3+ (M = Ca/Sr) Single-Phase Full-Color Phosphor with High Thermal Emission Stability

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Two series of phosphors of Ca 8 MgSc(PO 4 ) 7:Dy 3+ and Sr 8 MgSc(PO 4 ) 7:Dy 3+ single-phase white-emitting phosphors with high thermal emission stability are synthesized by the high-temperature solid-state reaction. The crystal structure, photoluminescence (PL), PL excitation (PLE), and thermal PL quenching spectra of Ca 8 MgSc(PO 4 ) 7: x Dy 3+ and Sr 8 MgSc(PO 4 ) 7: x Dy 3+ were investigated and compared in detail. Upon excitation at 387 nm, M 8 MgSc(PO 4 ) 7: x Dy 3+ (M = Ca/Sr) showed white emission centered at 480, 571, 660, and 754 nm. The white-emitting Dy-phosphor Ca 8 MgSc(PO 4 ) 7:Dy 3+ (CMSP:Dy) had good terminal stability. The emission intensity of Ca 8 MgSc(PO 4 ) 7:Dy 3+ still remained 95.2% of that at room temperature at 160 °C, and remained 77.3% at 300 °C under 387 nm excitation.