Core shell quantum dot and electronic device including the same

A display device comprising a photoluminescent element comprising a substrate and a light emitting layer disposed on the substrate,

• wherein the light emitting layer comprises a first section and a second section, the first section being configured to emit first light and the second section being configured to emit second light different from the first light,
• wherein the first section comprises a first quantum dot polymer composite,
• wherein the quantum dot polymer composite comprises a polymer matrix;
• and a core shell quantum dot dispersed in the polymer matrix, and
• where the core shell quantum dot comprises:
• a semiconductor nanocrystal core comprising indium and phosphorus, and a semiconductor nanocrystal shell disposed on the semiconductor nanocrystal core, the semiconductor nanocrystal shell comprising zinc, selenium, and sulfur,
• wherein the core shell quantum dot has a mole ratio of sulfur to selenium of greater than or equal to about 0.05:1 to less than or equal to about 3.5:1, and a mole ratio of zinc to indium of greater than or equal to about 10:1 and less than or equal to about 24:1,
• wherein the core shell quantum dot does not comprise cadmium.