色度
荧光粉
光致发光
白云石
发光
色温
分析化学(期刊)
材料科学
铕
光致发光激发
光谱学
显色指数
化学
光电子学
光学
矿物学
磷灰石
物理
量子力学
色谱法
作者
Ning Guo,Shuo Li,Jishen Chen,Jing Li,Yuefeng Zhao,Lu Wang,Chengzheng Jia,Ruizhuo Ouyang,Wei Lü
标识
DOI:10.1016/j.jlumin.2016.07.015
摘要
Novel single-phased Eu2+/Mn2+-coactivated whitlockite-type Ca9MgK(PO4)7 phosphors which can emit white light upon UV light excitation, are prepared by the solid-state method, and their luminescence properties are systematically investigated via a combination of X-ray powder diffraction and spectroscopy measurements. For Eu2+–Mn2+ codoped samples, an efficient energy transfer process can takes place and its mechanism is a resonant type via a dipole-quadrupole interaction which can be elucidated by Dexter׳s theoretical model. Following the principle of energy transfer, myriad luminescence colors with a large gamut from blue to purplish red and across white zone in a line in the chromaticity diagram of the CIE can be obtained by simply adjusting the concentration ratio of Eu2+ to Mn2+. Photoluminescence spectra reveal that the white color emission is originated from the combination of two emission bands of Eu2+ and Mn2+ ions. Additionally, their CIE chromaticity coordinates and correlated color temperatures (CCT) have been calculated and discussed in detail. The luminescence suggest that whitlockite-type phosphor, Ca9MgK(PO4)7, co-activated with europium and manganese, is a promising single-phased white-emitting candidate for use in ultraviolet-chip-based white LEDs.
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