Semiconductor nanocrystal particles and devices including the same

An electroluminescent device, comprising:

• an anode;
• a cathode;
• and
• a quantum dot emission layer comprising a plurality of quantum dots, each quantum dot of the plurality of quantum dots comprising:
• a core, comprising a first semiconductor nanocrystal comprising zinc, selenium, and tellurium;
• and
• a shell, comprising a second semiconductor nanocrystal having a different composition from the first semiconductor nanocrystal, and wherein the second semiconductor nanocrystal comprises zinc and at least one of sulfur and selenium, wherein the shell is disposed on the core,
• wherein the plurality of quantum dots are configured to emit blue light comprising a maximum emission peak in a wavelength region of greater than or equal to about 440 nanometers and less than or equal to about 470 nanometers,
• wherein a full width at half maximum (FWHM) of the maximum emission peak is from 10 nanometers to about 30 nanometers, and
• wherein the plurality of quantum dots do not comprise cadmium.