In embodiment, a binder composition includes a multifunctional compound containing three or more functional groups, a first bifunctional epoxy resin, and a second bifunctional epoxy resin. The second bifunctional epoxy resin can have a weight average molecular weight greater than a weight average molecular weight of the first bifunctional epoxy resin, and a mass ratio of the first bifunctional epoxy resin and the second bifunctional epoxy resin is in a range from 0.45:1 to 7.0:1. In an embodiment, an epoxy-based cured product includes such binder composition. And in an embodiment, a light emitting layer includes such epoxy-based cured product.

A nanocrystal particle including at least one semiconductor material and at least one halogen element, the nanocrystal particle including: a core comprising a first semiconductor nanocrystal; and a shell surrounding the core and comprising a crystalline or amorphous material, wherein the halogen element is present as being doped therein or as a metal halide.