Cadmium-free quantum dot nanoparticles

A method of making a semiconductor nanoparticle, comprising:

• combining an indium source precursor and at least two metal source precursors selected from the group consisting of magnesium source precursors, aluminum source precursors, calcium source precursors and zinc source precursors in a solvent at a first temperature to form a mixture;
• adding a molecular seeding compound to the mixture at the first temperature to form a molecular seeding compound-containing mixture;
• adding a phosphorus source precursor to the molecular seeding compound-containing mixture to form a semiconductor nanoparticle precursor mixture;
• heating the semiconductor nanoparticle precursor mixture to a second temperature;
• and
• annealing the semiconductor nanoparticle precursor mixture at the second temperature.