NDLI: Structure and luminescence behavior of a single-ion activated single-phased Ba2Y3(SiO4)3F:Eu white-light phosphor

Content Provider	Royal Society of Chemistry (RSC)
Author	Wang, Yuansheng Hu, Tao Lin, Hang Xu, Ju Wang, Bo Xiao, Guangcan Wang, Jiaomei Huang, Qingming
Copyright Year	2017
Abstract	The development of a single-ion activated single-phased white-light phosphor is of great importance in the field of near ultraviolet based w-LED lighting. In this work, a Ba2Y3(SiO4)3F:Eu fluoride apatite, which shows a broad emission band covering the entire visible region with tunable color rendition, was successfully synthesized via a high-temperature solid-state route. The microstructure and composition of the phosphor were carefully examined with the aid of XRD Rietveld refinement, HRTEM and SEM analyses, as well as XPS measurement. Spectroscopic studies revealed the site occupancy conditions of Eu2+, i.e., the Eu2+(I) band centering at 470 nm originates from the [BaO9] 4f site, while the Eu2+(II) one peaking at 600 nm comes from the [BaO6F] 6h site. Interestingly, the obtained white light can be readily tuned from cool to warm just by varying the Eu doping content. The brightest luminescence was achieved when the Eu concentration reached 1 mol%, beyond which the d–d interaction-based energy transfer between Eu2+ ions would result in concentration quenching. The underlying mechanism of the incomplete conversion from Eu3+ to Eu2+ under a reducing atmosphere was explored, which was believed to be caused by the rigid framework of the crystal structure. After coupling Ba2Y3(SiO4)3F:Eu with a commercial 3W 370 nm UV chip, the constructed w-LED yielded warm white light with a CIE coordinate of (0.402, 0.371), CCT of 3530 K, and CRI of 83.5, upon being driven by a 350 mA forward-biased current.
Starting Page	1789
Ending Page	1797
Page Count	9
File Format	HTM / HTML PDF
ISSN	20507526
Volume Number	5
Issue Number	7
Journal	Journal of Materials Chemistry C
DOI	10.1039/c6tc04350j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Eu Ultraviolet Fluoride Apatite X-ray crystallography Rietveld refinement Dopant Luminescence Reducing atmosphere International Commission on Illumination
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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