Cyan Broad-Band Emission Phosphor with Scandium Silicon Multiple-Ring Structure for White Light-Emitting Diodes and Field Emission Displays.

Silicate phosphor KBaScSi2O7:Ce3+ (KBSS:Ce3+), as a novel material, has been prepared by the solid-state method in this study. The crystal structure, luminescent properties, thermal stability, and cathodoluminescence (CL) properties of this material were analyzed systematically. It concludes that the phosphor can emit cyan light with emission peak at 509 nm under n-UV light excitation (300-400 nm). By coating KBSS:Ce3+ with a red-emitting CaAlSiN3:Eu2+ on a n-UV (365 nm) light-emitting diode (LED) chip, the intense warm white light with high RA (83.4) and low CCT (3652) can be produced under a 350 mA forward bias current.In addition, the CL performance shows that KBSS:0.10Ce3+ has high saturation current and voltage and good color stability under low voltage conditions. All these results indicate that KBSS:Ce3+ phosphor will be very promising in LED and field emission display applications.