Rare-earth free narrow-band green-emitting KAlSi2O6:Mn2+ phosphor excited by blue light for LED-phosphor material

Abstract

A novel rare-earth free green-emitting KAlSi₂O₆:Mn²⁺ phosphor is synthesized by traditional solid-state reaction. The structure, photoluminescence and temperature-dependent properties are investigated. KAlSi₂O₆:Mn phosphor can emit green light peaking at 513 nm with narrow full-width at half-maximum of 30 nm upon 450 nm excitation. The quantum yields and Commission Internationale de I’Eclairage (CIE) color coordinates are 30.2% and (0.27, 0.64). The white LED is fabricated by KAlSi₂O₆:Mn and CaAlSiN₃:Eu (red phosphor) combined with blue LED chip. Its correlated color temperature, color coordinates, R_a and luminous efficiency are 4775 K, (0.35, 0.36), 85.1 and 110.2 lm W⁻¹, respectively. It is demonstrated that KAlSi₂O₆:Mn²⁺ phosphor as the potential material could be simulated to blue-LED for producing efficient white-light.