A cyan-emitting phosphor Ca3SiO4(Cl,Br)2:Eu2+ with high efficiency and good thermal stability for full-visible-spectrum LED lighting
作者单位：School of Metallurgy and Chemistry Engineering Jiangxi University of Science and Technology Xuyu Optoelectronics Co.Ltd
会议名称：《中国稀土学会2020学术年会暨江西(赣州)稀土资源绿色...》
会议日期：2020年
学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 0803[工学-光学工程]
关 键 词：solid solution cyan phosphor full-spectrum white LED
摘 要：CaSiOClBr:0.02Eucyan-green phosphors with high efficiency and good thermal stability were prepared via high temperature solid-state method.The crystal structure,luminescence properties and thermal stability of as-prepared phosphors were systematically investigated by means of X-ray diffraction (XRD),photoluminescence excitation spectra (PLE),photoluminescence spectra (PL),CIE coordinates and variable temperature spectra.With the increase of Brin CaSiOClBr:0.02Eu,the emission peak shifted from 502 nm to 491 nm under near-UV (n-UV) excitation,which can make amends for the cyan gap (480–520 nm) and realize high color rendering.The blue shift of the emission band can be ascribed to the small crystal field splitting and Stokes shift.Furthermore,the white LED devices was fabricated via blue-emitting Sr(PO)Cl:Eu,green-emitting YAGG:Ce,red-emitting (Ca,Sr)AlSiN:Eu,and the cyan phosphor CaSiO(Cl,Br):Euwith 410 nm-chip.The WLED exhibits a warm and bright white light with low correlated CCT (3969 K),high Ra (96.9),and CIE color coordinates of(0.3828,0.3810).The results indicate that CaSiOClBr:0.02Eucan be used as a potential candidate cyan phosphor for full-spectrum warm white LED.