PAPER Sajjad Ullah, Sidney J. L. Ribeiro et al. A UV-visible-NIR active smart photocatalytic system based on NaYbF 4 :Tm 3+ upconverting particles and Ag 3 PO 4 /H 2 O 2 for photocatalytic processes under light on/light off conditions Materials Advances rsc.li/materials-advances ISSN 2633-5409 Volume 3 Number 6 21 March 2022 Pages 2601–2948