White upconversion luminescence in CaF2:Yb(3+)/Eu(3+) powders via the incorporation of Y(3+) ions

• Published in: Physical chemistry chemical physics : PCCP Vol. 18; no. 24; pp. 16094 - 16097
• Main Authors: Li, Yangyang, Guo, Junjie, Liu, Xiaohui, Aidilibike, Tuerxun, Qin, Weiping
• Format: Journal Article
• Language: English
• Published: England 28.06.2016
• ISSN: 1463-9084
• DOI: 10.1039/c6cp02849g

White upconversion luminescence (UCL) was achieved under 980 nm excitation in the CaF2:Yb(3+)/Eu(3+) material using Y(3+) to adjust the luminescence performance. In this luminescent system, Yb(3+) not only plays the role of a sensitizer of Eu(3+), but also generates green fluorescence from Yb(3+) dimers (2-Yb(3+)) by cooperative transitions in the CaF2 matrix. One of the primary colors of green corresponds to the 2-Yb(3+) cooperative emission exactly. Eu(3+) acts as an activator for emitting red and blue fluorescence simultaneously. Interestingly, the color of the UCL can be controlled by adjusting the doping concentration of Y(3+) ions, and white UCL was realized when the concentration of Y(3+) was 1%.