Sub‐20‐nm Fluorescent Nanodiamonds as Photostable Biolabels and Fluorescence Resonance Energy Transfer Donors

Fluorescent nanodiamonds (FNDs) of 10–20 nm in size have been produced by helium ion irradiation and isolated by differential centrifugation. Spectroscopic characterization of the FNDs with fluorescence microscopy and fluorescence correlation spectroscopy indicates perfect photostability and use as an alternative to far-red fluorescent proteins for biolabeling and fluorescence resonance energy transfer applications. 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.