文摘
Innovative strategies to unleash the freedom of the excitation wavelengths of upconversion nanoparticles have recently been developed. In article number 1602843, W. Huang, G. Han, and co-workers comprehensively review recent advances in the design, property tuning, and applications of ≈800 nm excited upconversion nanoparticles. These nanoparticles show superior potential for biosensing, bioimaging, drug delivery, and therapy.