Homogeneous anaerobically stable quantum dot concentrates
The present disclosure provides nanostructure compositions and methods of producing nanostructure compositions. The nanostructure compositions comprise at least one population of nanostructures, at least one reactive diluent, at least one anaerobic stabilizer, and optionally at least one organic resin. The present disclosure also provides nanostructure films comprising a nanostructure layer and methods of making nanostructure films.
1. A method of preparing a nanostructure composition, the method comprising:
(a) providing a composition comprising at least one population of nanostructures and at least one solvent, wherein the at least one population of nanostructures contains a core selected from the group consisting of InP, InZnP, InGaP, CdSe, CdS, CdSSe, CdZnSe, CdZnS, ZnSe, ZnSSe, InAs, InGaAs, and InAsP;
(b) admixing at least one reactive diluent and at least one anaerobic stabilizer with the composition of (a), wherein the at least one anaerobic stabilizer is a nitroxide-containing compound or a nitroso-containing compound;
(c) removing the at least one solvent in the composition of (b); and
(d) admixing at least one organic resin with the composition of (c), wherein the at least one organic resin is a mercapto-functional compound, and wherein the weight percentage of the reactive diluent in the nanostructure composition is between about 50% and about 99%.
2. The method of claim 1 , wherein the at least one reactive diluent is isobornyl acrylate.
3. The method of claim 1 , wherein the at least one anaerobic stabilizer comprises a
group.
4. The method of claim 1 , wherein the nanostructure composition comprises two populations of nanostructures, one reactive diluent, and one anaerobic stabilizer.
5. The method of claim 1 , wherein the at least one anaerobic stabilizer is 4-hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl (4-hydroxy-TEMPO).
6. The method of claim 1 , wherein the at least one reactive diluent is isobornyl acrylate and the at least one anaerobic stabilizer is 4-hydroxy-TEMPO.
7. The method of claim 6 , wherein the nanostructure composition comprises as a weight percentage 200 ppm 4-hydroxy-TEMPO in relation to isobornyl acrylate.
8. The method of claim 1 , wherein the at least one organic resin is a thermosetting resin or a UV curable resin.
9. The method of claim 1 , wherein the at least one organic resin is a UV curable resin.
10. The method of claim 1 , further comprising:
(e) admixing at least one thermal initiator or photoinitiator with the composition of (d).
11. The method of claim 1 , wherein the nanostructures are quantum dots.
12. The method of claim 11 , wherein the quantum dots are InP and/or CdSe quantum dots.
13. The method of claim 1 , wherein the mercapto-functional compound is pentaerythritol tetra(3-mercapto-propionate) (PETMP); trimethylol-propane tri(3-mercaptopropionate) (TMPMP); glycol di(3-mercapto-propionate) (GDMP); tris[25-(3-mercaptopropionyloxy)ethyl]isocyanurate (TEMPIC); di-pentaerythritol hexa(3-mercapto-propionate) (Di-PETMP); ethoxylated trimethylolpropane tri(3-mercapto-propionate); polycaprolactone tetra(3-mercapto-propionate); pentaerythritol tetramercaptoacetate (PETMA); trimethylolpropane trimercaptoacetate (TMPMA); or glycol dimercaptoacetate (GDMA).