Methods for making improved quantum dot resin formulations

A method for making polymerizable monomer compositions comprising:

• Purifying a (b) monomer mixture of (i) one or more monomers having at least two polymerizable vinyl groups as part of a (meth)acrylate ester group or attached directly to an aromatic ring or a cycloaliphatic group and (ii) one or more monomers having a single polymerizable vinyl group as part of a (meth)acrylate ester group in which the ester contains a cycloaliphatic group or a C6 to C24 alkyl group by any one or more of treating the monomer mixture in an activated porous alumina or silica column having, for example, a surface area of from 100 to 300 m2/g;
• sieve drying the monomer mixture in a vacuum followed by drying over dried molecular sieves having average pore sizes of from 2 to 20 Angstroms;
• freeze-pump-thaw (FPT) treating by freezing the monomer mixture in a vessel or container to a temperature below −75° C., degassing the monomer mixture by application of vacuum in the range of 102 to 10−2 Pa), sealing the vessel or container under vacuum, and thawing the composition to room temperature
• storing the purified monomer mixture (b) in a dry and inert gas;
• and,
• combining in an inert atmosphere the resulting monomer mixture (b) with a composition (a) of quantum dots in dry form or in organic solvent solution to make a polymerizable monomer composition that comprises 150 ppm or less of H2O, 100 ppm or less of total polymerization inhibitor compounds and 150 ppm or less of organic radically active molecules.