Nanocrystal superlattices, are ordered arrays of nanocrystals achieved through self-assembly. These can be either of one type of NCs or two/three components, enabling to design meta-crystals with atomic precision and explore emergent material properties. One topic we study is emergent correlated emission from superlattices, excitons in these materials will interact in non-trivial way modifying the emission properties. The vision is to engineer superlattices with fast and coherent emission for quantum emitters.