TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Process: The solution is further maintained at temperature (I) for amount (I) of time effective to grow quantum dots of a selected size. The solution is prepared by dissolving precursor (I) in mixture (I) comprising thiol (I) and amine (I) to form solution (I), dissolving precursor (II) in mixture (II) comprising thiol (II) and amine (II) to form solution (II), heating solution (I) at 140-240 degrees C, and mixing solution (I) and solution (II) at a rate such that the temperature remains the same at 140-240 degrees C before mixing. The temperature differs by 0-10 degrees C. Temperature (I) is 200-240 degrees C. Alternately, the solution is prepared by mixing precursors (I and II) with the thiol and amine without heating and heating the mixture at 90-140 degrees C. The yield of the quantum dots is 90-100%. The solution is heated to an initial temperature of 140-230 degrees C at a rate required to achieve a selected size standard distribution, before heating to temperature (I). The standard deviation in one or more dimension is less than 25%. The quantum dots have a height of less than 20 nm. The solution is heated to the initial temperature in an amount of time of more than 0-15 minutes. The amount (I) of time is more than 0-60 minutes. Alternately, a solution comprising precursor (III) is further prepared and mixed with the quantum dots to form a mixture. The mixture is heated at 50-230 degrees C. The mixture is heated for amount (II) of time which is more than 0-60 minutes required to form a shell of a selected thickness. The selected shell is more than a quantum dot core volume. Preferred Composition: The composition further comprises a shell comprising an alloy of sulfur or alloy of sulfur and selenium. The composition has an absorbance onset of 500-1200 nm and/or photoluminescence 530-1400 nm. The composition comprises quantum dots having a standard deviation in size distribution of less than 25%, and a core composition of formula: MSexS2-x, where M is group IB metal and/or group IIIB metal and x 1.5-2. The precursor (III) comprises copper, indium, zinc, selenium, cadmium, aluminum, gallium, silver and/or gold. The precursors (I and II) comprise copper, indium, gallium, silver, gold, zinc, cadmium and/or selenium. The precursors (I and II) are elemental metals or metalloids, salts, halides and/or oxides. When the precursor (I) comprises a group 11 metal and/or group 13 metal, the precursor (II) is selenium and the quantum dots are of formula: MSexS2-x, where M is group 11 metal and/or group 13 metal, preferably copper, indium, zinc, silver, gold, gallium and/or cadmium preferably copper and indium or zinc, and x more than 0-2. The cation precursor is copper iodide, zinc acetate, indium acetate, gallium acetate and/or silver iodide. The shell precursor is zinc acetate, cadmium oxide and/or selenium metal.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The solution comprises 1-25C aliphatic thiol (I) and 1-25C aliphatic amine (I). Aliphatic thiol (I) is 1-dodecanethiol, 1-undecanethiol, 1-decanethiol, 1-octanethiol and/or 1-hexadecanethiol. Aliphatic amine (I) is oleylamine, octylamine, dodecylamine, hexadecylamine, butylamine and/or methylamine. Alternately, the solution comprises aliphatic thiol (II) and/or aliphatic amine (II). The aliphatic thiol and aliphatic amine used in manufacture of the composition is 1-dodecanethiol and oleylamine.