A novel blue-emitting KCa₄（BO₃）₃:Ce³⁺ phosphor for white LED application

【摘要】 A blue-emitting phosphor KCa₄（BO₃）₃ doped with Ce³⁺ was prepared by solid state reaction. Its phase purity and synthesis temperature were investigated by powder X-ray diffraction（XRD）. The optical properties were studied by photoluminescence（PL） and photoluminescence excitation（PLE） spectra. In addition, the temperature-dependent PL measurement was also carried out. The phosphor showed a broad and strong blue emission centered at 428 nm under near ultraviolet light excitation at 370 nm. Ce³⁺ ions in the three Ca sites of the host showed the similar centroid shift（εc） and crystal field splitting（εcfs）. The quantum efficiency of the phosphor with optimal doping concentration was 68% of that of commercial blue phosphor BaMgAl₁₀O₁₇:Eu²⁺. It indicated the promising applicability as a blue-emitting phosphor for UV-converting white light-emitting diodes.更多还原

【Abstract】 A blue-emitting phosphor KCa₄（BO₃）₃ doped with Ce³⁺ was prepared by solid state reaction. Its phase purity and synthesis temperature were investigated by powder X-ray diffraction（XRD）. The optical properties were studied by photoluminescence（PL） and photoluminescence excitation（PLE） spectra. In addition, the temperature-dependent PL measurement was also carried out. The phosphor showed a broad and strong blue emission centered at 428 nm under near ultraviolet light excitation at 370 nm. Ce³⁺ ions in the three Ca sites of the host showed the similar centroid shift（εc） and crystal field splitting（εcfs）. The quantum efficiency of the phosphor with optimal doping concentration was 68% of that of commercial blue phosphor BaMgAl₁₀O₁₇:Eu²⁺. It indicated the promising applicability as a blue-emitting phosphor for UV-converting white light-emitting diodes.更多还原