title: Theranostic upconversion nanoparticles (I).
abstract: This theme issue provides a comprehensive collection of original research articles on the creation of diverse types of theranostic upconversion nanoparticles, their fundamental interactions in biology, as well as their biophotonic applications in noninvasive diagnostics and therapy.
authors.forename: Guanying
authors.initials: G
authors.lastname: Chen
authors.forename: Gang
authors.initials: G
authors.lastname: Han
mesh_terms: D015374:Biosensing Techniques / Q000379:methods; D053758:Nanoparticles / Q000737:chemistry* / Q000627:therapeutic use / Q000633:toxicity; D061848:Optical Imaging / Q000379:methods
keywords: Bioimaging; Multimodal.; Nontoxicity; Plasmonics; Upconversion