Single‐Band Upconversion Emission in Lanthanide‐Doped KMnF₃ Nanocrystals

Clear sight: The upconversion emission spectra of KMnF3 nanocrystals co-doped with Yb/Er (18:2 mol %; see picture) and Yb/Ho (18:2 mol %) reveal strong single-band emissions. The application of this pure, single-band emission for deep-tissue imaging is demonstrated. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. 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.