荧光粉
单斜晶系
量子产额
发光
材料科学
激活剂(遗传学)
离子
白云石
色温
固态照明
分析化学(期刊)
显色指数
热稳定性
量子效率
发光二极管
晶体结构
矿物学
光电子学
荧光
结晶学
光学
化学
物理
冶金
钙
有机化学
基因
生物化学
色谱法
作者
Jiangcong Zhou,Mengting Chen,Jianyan Ding,Juxiang Zhang,Jiaying Chen,Dewu Wu,QuanSheng Wu
标识
DOI:10.1016/j.ceramint.2021.08.080
摘要
The site occupation engineering of activators in the phosphor directly affects its luminescence properties; thus, revealing the relationship between the site occupation and the activator luminescence is of great significance. In this work, a high efficiency green phosphor Sr8CaLu(PO4)7: Eu2+ (SCLP: Eu2+) was successfully constructed based on the model of whitlockite β-Ca3(PO4)2 host, and its phase structure, morphology features and optical properties were systemically investigated. The as-prepared SCLP: Eu2+ phosphor had a monoclinic symmetry and a broad green emission from 420 to 730 nm with a quantum yield as high as 77%. The SCLP host offered five types of Sr2+ ions sites for Eu2+ ions occupation; and the PL spectra were divided into three sub-peaks locating at 501 (19960.08 cm−1), 527 (18975.33 cm−1) and 566 nm (17667.84 cm−1), which were proved to the emission of Eu2+ ions at the nine-coordinated Sr(1, 3, 5)O9, eight-coordinated Sr(2)O8 and special vacant Sr(4)O6 sites, respectively. The thermal stability was improved through the package of SiO2, and the activation energy was enhanced from 0.1098 to 0.1457 eV. Eventually, the SCLP: xEu2+ phosphors were applied in white light-emitting diode, showing high color rendering index (Ra = 94.4 and R9 = 81.7) and moderate correlated color temperature (CCT = 4902 K). This work could help to understand the mechanism behind the site-controlled activator emission and offer some meaningful ideas to design a new whitlockite phosphor with desirable spectral emission for application in high quality lighting source.
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