Quantum dot-containing compositions including an emission stabilizer, products including same, and method
View Patent ↗The present invention relates to a composition including quantum dots and an emission stabilizer, products including same, and methods, including methods for improving, or enhancing the emission stability of quantum dots. Inclusion of an emission stabilizer in a composition can improve or enhance the stability of at least one emissive property of the quantum dots in the composition against degradation compared to a composition that is the same in all respects except that it does not include the emission stabilizer. Examples of such emissive properties include, by way of example only, lumen output, lumen stability, color point (e.g., CIE x, CIE y) stability, wavelength stability, FWHM of the major peak emission, absorption, solid state EQE, and quantum dot emission efficiency.
1. A composition comprising emissive quantum dots and an emission stabilizer, wherein the emission stabilizer comprises an aliphatic phosphate-based additive, and wherein the aliphatic phosphate-based additive comprises at least one of potassium octyl phosphate, potassium nonyl phosphate, potassium decyl phosphate, potassium undecyl phosphate, potassium lauryl phosphate, potassium myristyl phosphate, potassium cetyl phosphate, potassium stearyl phosphate, dicetyl phosphate, ceteth-10 phosphate, ceteth-20 phosphate, and ceteth-30 phosphate; wherein the emission stabilizer is present in an amount from about 0.01 to about 99 weight percent of the composition.
2. A composition in accordance with claim 1 wherein quantum dots further comprise one or more ligands attached to a surface thereof.
3. A composition in accordance with claim 2 wherein the emission stabilizer does not displace the ligands.
4. A composition in accordance with claim 2 wherein the composition consists essentially of quantum dots having one or more ligands attached to an outer surface and an emission stabilizer, wherein the emission stabilizer is in addition to the ligands attached to the quantum dots.
5. A composition in accordance with claim 2 wherein the emission stabilizer and ligands have different chemical compositions.
6. A composition in accordance with claim 1 wherein the composition further includes an additional emission stabilizer comprising an aliphatic phosphine oxide-based additive.
7. A composition in accordance with claim 6 wherein the aliphatic phosphine oxide-based additive comprises a substituted or unsubstituted aliphatic phosphine oxide.
8. A composition in accordance with claim 1 wherein the concentration of quantum dots is from about 0.1 to about 98 weight percent of the composition.
9. A composition in accordance with claim 1 wherein the composition further includes a host material.
10. A composition in accordance with claim 9 wherein the emission stabilizer is included in the composition in an amount in a range from about 0.01 to about 10 weight percent of the composition.
11. A composition in accordance with claim 1 wherein the composition further includes an additional emission stabilizer comprising tri-octyl phosphine oxide.
12. A composition in accordance with claim 1 wherein the composition includes two or more emission stabilizers.
13. A composition with claim 1 wherein the aliphatic phosphate-based additive comprises potassium octyl phophate, potassium nonyl phophate, potassium decyl phosphate, potassium undecyl phosphate, potassium lauryl phosphate, potassium myristyl phosphate, potassium cetyl phosphate, or potassium stearyl phosphate.
14. A composition comprising emissive quantum dots and an emission stabilizer, wherein the emission stabilizer comprises potassium lauryl phosphate.
15. An optical component comprising a composition in accordance with claim 1 and a structural member that supports or contains the composition.
16. An optical component in accordance with claim 15 wherein the composition is hermetically contained within the structural member.
17. A composition comprising emissive quantum dots and an emission stabilizer, wherein the emission stabilizer comprises an aliphatic phosphate-based additive, and wherein the aliphatic phosphate-based additive comprises potassium hydrogen octyl phosphate, potassium hydrogen nonyl phosphate, potassium hydrogen decyl phosphate, potassium hydrogen undecyl phosphate, potassium hydrogen lauryl phosphate, potassium hydrogen myristyl phophate, potassium hydrogen cetyl phosphate, or potassium hydrogen stearyl phosphate.