Near‐IR‐Sensitive Upconverting Nanostructured Photonic Cellulose Films

Upconverting cellulose nanocomposites are presented. Helicoidal co-assembly of cellulose nanocrystals with polyvinylalcohol-stabilized NaYF4:Yb,Er hexagonal nanorods yields flexible upconverting chiral photonic films that exhibit distinct optical upconversion with near-IR light and circularly polarized reflection in the visible spectrum. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to 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.