Quantum dots, a composition or composite including the same, and an electronic device including the same

A quantum dot comprising

• a semiconductor nanocrystal core comprising indium and phosphorous,
• a first semiconductor nanocrystal shell disposed on the semiconductor nanocrystal core, the first semiconductor nanocrystal shell comprising zinc and selenium, and
• a second semiconductor nanocrystal shell disposed on the first semiconductor nanocrystal shell, the second semiconductor nanocrystal shell comprising zinc and sulfur,
• wherein the quantum dot does not comprise cadmium, and
• wherein in the quantum dot, a mole ratio of sulfur with respect to selenium is less than or equal to about 2.5:1, and
• wherein when the quantum dot has a photoluminescent peak wavelength in a range from about 500 nanometers to about 550 nanometers, and a molar ratio of zinc with respect to indium is less than or equal to 48:1, and
• when the quantum dot has a photoluminescent peak wavelength in a range from about 600 nanometers to about 650 nanometers, a molar ratio of zinc with respect to indium is less than or equal to about 30:1.