Light emitting nanocrystals and methods of making light emitting nanocrystals

A method of making semiconductor nanocrystals comprising:

• heating a first mixture including:
• a first M donor including Cu;
• and
• a second M donor including Al;
• and
• adding a first E donor including a sulfur or selenium to the first mixture, thereby forming a population of nanocrystal cores having the formula:
• Cu—Al—X2, where X is S or Se,
• the semiconductor nanocrystals having a luminescence quantum yield of at least 10%.

A semiconductor nanocrystal comprising a core including a IB-IIIA-VIA semiconductor material, wherein:

• the nanocrystal has a luminescence quantum yield of at least 10%,
• the nanocrystal has a peak luminescence emission wavelength in the range of 380 nm to 560 nm,
• the nanocrystal is a defective nanocrystal,
• the group IB element is copper,
• the group IIIA element is aluminum, and
• the group VIA element is sulfur or selenium.