The present application discloses a method of preparing quantum dots. The method includes combining a first quantum dots precursor and a second quantum dots precursor to form a first reaction mixture including a supercritical liquid medium; nucleating and growing the quantum dots from the first quantum dots precursor and the second quantum dots precursor in the first reaction mixture including the supercritical liquid medium; and forming a solid quantum dots material in the presence of the supercritical liquid medium.