Uniform Nanostructured Arrays of Sodium Rare‐Earth Fluorides for Highly Efficient Multicolor Upconversion Luminescence

Array of light: Nanostructured arrays of NaMF4 (M=rare earth metal) can be prepared by a hydrothermal method. The arrays consist of nanoparticles with well-controlled morphologies (tubes, disks, or rods), phases (cubic or hexagonal), and sizes (80–900 nm). Multicolor upconversion fluorescence is realized in arrays of NaYF4 codoped with Er3+ and Yb3+ or with Tm3+ and Yb3+ (see picture). Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2007/z702519_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.