“…Another factor with deleterious consequences for the spin purity are dangling bonds and other surface defects, which can invoke spin flipping due to the interaction with the unpaired electrons in dangling bonds and are, thus, to be avoided. [21] The most common strategies involve the design of surface molecules with the right electronic structure to remove trap states from the band gap, the growth of an epitaxial shell onto the NC core or filling the gaps within NC solids by an inorganic, macroscopic matrix, all of which have been outlined in section 1.1. Finally, it should be emphasized that the stability of triplets is hugely affected by the presence of oxygen, such that efficient triplet harvesting will benefit strongly from operation under inert conditions, for instance by encapsulation.…”