1. A quantum dot comprising:a core comprising indium and having a first band gap;
a first layer substantially surrounding the core and comprising a first metal chalcogenide having a second band gap that is greater than the first band gap; and
a second layer on the first layer comprising a second metal chalcogenide having a third band gap that is greater than the second band gap,
wherein the first layer comprises three or more monolayers and less than or equal to fifteen monolayers of the first metal chalcogenide.