A quantum dot includes a core containing a first semiconductor nanocrystal, a first shell around (e.g., surrounding) the core and containing a second semiconductor nanocrystal different from the first semiconductor nanocrystal, and a second shell around (e.g., surrounding) the first shell and containing a third semiconductor nanocrystal different from the first semiconductor nanocrystal and the second semiconductor nanocrystal, wherein the core has a band gap of about 1.5 eV to about 3.3 eV, a band gap of the second shell is greater than a band gap of the core and is about 3.54 eV or less, and a band gap of the first shell is greater than a band gap of the core and smaller than a band gap of the second shell.