Quantum dots and devices including the same

A display device, comprising:

• a light source emitting a blue light;
• and
• a quantum dot polymer composite comprising a quantum dot,
• wherein a portion of the blue light is configured to be absorbed by the quantum dot,
• wherein the quantum dot comprises:
• a core of InZnP, and
• a shell disposed on the core,
• wherein the shell comprises a first shell layer consisting of ZnSe, a second shell layer adjacent to the first shell layer, the second shell layer comprising ZnSeS and a dopant of aluminum or lithium, and a third shell layer disposed on the second shell layer, the third shell layer comprising ZnS,
• wherein the quantum dot has a particle size of greater than or equal about 2 nanometers and less than or equal to about 20 nanometers, and
• wherein the quantum dot composite exhibits a photoconversion efficiency greater than 57%, and does not include cadmium.

A display device, comprising:

• a light source emitting a blue light;
• and
• a quantum dot polymer composite comprising a quantum dot,
• wherein a portion of the blue light is configured to be absorbed by the quantum dot,
• wherein the quantum dot comprises:
• a core comprising a first semiconductor nanocrystal, and
• a shell disposed on the core, the shell comprising a second semiconductor nanocrystal and a dopant within the second semiconductor nanocrystal,
• and the second semiconductor nanocrystal comprises zinc, sulfur, and selenium,
• wherein the second semiconductor nanocrystal comprises a first shell layer and a second shell layer adjacent to the first shell layer, wherein a composition of the first shell layer is different from a composition of the second shell layer, and the second shell layer comprises a ZnSeS and the dopant,
• wherein the dopant comprises lithium, beryllium, magnesium, aluminum, gallium, boron, or a combination thereof,
• wherein the quantum dot composite exhibits a photoconversion efficiency greater than 57%, and does not include cadmium, and
• wherein the core does not include copper.