Upconversion nanoparticles: on the way from diagnostics to theranostics Alla Generalova, Kristina Mironova, Natalya Sholina, Vasylina Rocheva, Andrey Nechaev, Ekaterina Grebenik, Anna Guller, Andrey Zvyagin, Sergey Deyev, Vitaly Zubov and Evgeny Khaydukov EPJ Web Conf., 190 (2018) 03001 Published online: 26 September 2018 DOI: 10.1051/epjconf/201819003001