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

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• 作者：Xiaohui SUN (孙晓慧)^a ; Chaomin ZHANG (张朝民)^a ; Jianbao WU (吴建宝)^a ; Pengfei ZHU (朱鹏飞)^a ; Xiuli ZHANG (张修丽)^a ; ^{xlzhang@sues.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yin HANG (杭 寅)^b
• 关键词：optical materials ; luminescence ; light-emitting diodes ; borate ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：34
• 期：6
• 页码：571-575
• 全文大小：1014 K

文摘

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 (ɛ_c) and crystal field splitting (ɛ_cfs). 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.