Innentitelbild: Towards Utilising Photocrosslinking of Polydiacetylenes for the Preparation of "Stealth" Upconverting Nanoparticles (Angew. Chem. 49/2018). (14th November 2018) - Nsubuga, Anne; Zarschler, Kristof; Sgarzi, Massimo; Graham, Bim; Stephan, Holger; Joshi, Tanmaya