Near-infrared photopolymerization assisted by upconversion nanophosphors for biomedical applications Alexander G. Savelyev, Vladimir A. Semchishen, Andrey V. Nechaev, Kirill V. Khaydukov, Polina A. Demina, Alla N. Generalova and Evgeny V. Khaydukov EPJ Web Conf., 190 (2018) 04018 Published online: 26 September 2018 DOI: 10.1051/epjconf/201819004018