TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The crude solution is obtained by (i) contacting an indium(III) salt with at least one carboxylic acid, (ii) contacting the mixture obtained from the step (i) with the zinc carboxylate, and (iii) contacting the mixture obtained from the step (ii) with tris(trimethylsilyl) phosphine. The mixture obtained from the step (e), (g) and (iii) is heated to a temperature of 180-320 (preferably 240-310) degrees C. The zinc carboxylate is obtained by contacting at least one zinc salt consisting of zinc(toluene-3,4-dithiolate), zinc (para-toluene-sulfonate), zincdiethyl dithiocarbamate and/or zincdibenzyl dithiocarbamate with the carboxylic acid. Preferred Components: The first material of the first shell comprises zinc selenide (preferred) and/or zinc sulfide. The second material of the second shell comprises zinc selenide and/or zinc sulfide (preferred). The first shell has a lattice constant that lies between the core and second shell. The lattice constant difference between the core and the first shell is 2-8%, preferably 3-5%. The lattice constant difference between the core and the second shell is 5-13%, preferably 7-10%. The indium(III) salt consists of indium(III) acetate, indium(III) fluoride, indium(III) chloride, indium(III) bromide, indium(III) iodide, indium(III) nitrate, indium(III) triflate, indium(III) tosylate, indium(III) mesylate, indium(III) sulfate, indium(III) acetylacetonate, indium(III) tert-butoxide, indium(III) hydroxide, indium(III) perchlorate and/or indium (III) sulfide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The carboxylic acid consists of acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, heptanoic acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, acrylic acid, methacrylic acid, but-2-enoic acid, but-3-enoic acid, pent-2-enoic acid, pent-4-enoic acid, hex-2-enoic acid, hex-3-enoic acid, hex-4-enoic acid, hex-5-enoic acid, hept-6-enoic acid, oct-2-enoic acid, dec-2-enoic acid, undec-10-enoic acid, dodec-5-enoic acid, oleic acid, gadoleic acid, erucic acid, linoleic acid, alpha -linolenic acid, gamma -linolenic acid, calendic acid, eicosadienoic acid, eicosatrienoic acid, arachidonic acid, stearidonic acid, benzoic acid, para-toluic acid, ortho-toluic acid, meta-toluic acid, hydrocinnamic acid, naphthenic acid and/or cinnamic acid. The sulfur or selenium source consists of elemental sulfur, octanethiol, dodecanethiol, octadecanethiol, tert-butanedione, tributylphosphine sulfide, cyclohexyl isothiocyanate, alpha -toluenethiol, ethylene trithiocarbonate, allylmercaptan, bis(trimethylsilyl)sulfide, trioctylphosphine sulfide, and/or trioctylphosphine selenide.