Quantum dots, and an electronic device including the same
US-2021102119-A1 · Apr 8, 2021 · US
Quantum dot ink composition, and quantum dot electroluminescent device
US12441901B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12441901-B2 |
| Application number | US-202318169753-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 15, 2023 |
| Priority date | Feb 15, 2022 |
| Publication date | Oct 14, 2025 |
| Grant date | Oct 14, 2025 |
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Abstract
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A quantum dot ink composition including a plurality of quantum dots, and a mixed solvent including a Solvent a and a Solvent b, the ink composition having a surface tension of about 30 mN/m to about 40 mN/m, where Solvent a is a cycloalkane compound with at least one ring carbon having a linear C4 to C16 alkyl group, and Solvent b is an aromatic hydrocarbon compound having a linear C2 to C12 alkyl group. A quantum dot electroluminescent device including a light emitting layer formed from the quantum dot composition.
First claim
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What is claimed is: 1. A quantum dot ink composition, comprising a plurality of quantum dots, and a mixed solvent comprising a Solvent a and a Solvent b, wherein the quantum dot ink composition has a surface tension of about 30 milliNewtons per meter to about 40 milliNewtons per meter, wherein Solvent a is a cycloalkane compound with at least a ring carbon having a C4 to C16 linear alkyl group, and Solvent b is an aromatic hydrocarbon compound with at least a ring carbon having a C2 to C12 linear alkyl group. 2. The quantum dot ink composition of claim 1 , wherein Solvent b comprises a Solvent b-1, a Solvent b-2, or a combination thereof, wherein Solvent b-1 is an aromatic hydrocarbon compound with at least a ring carbon having a C2 to C12 linear alkyl group and having a surface tension of about 32 milliNewtons per meter to about 40 milliNewtons per meter, and Solvent b-2 is an aromatic hydrocarbon compound with at least a ring carbon having a C2 to C12 linear alkyl group and having a surface tension of about 25 milliNewtons per meter to less than about 32 milliNewtons per meter. 3. The quantum dot ink composition of claim 2 , wherein the mixed solvent comprises the Solvent a and the Solvent b-1. 4. The quantum dot ink composition of claim 2 , wherein the mixed solvent comprises the Solvent a and the Solvent b-2, and optionally further comprises at least one of Solvent b-1 or Solvent c, which is not Solvent a or Solvent b, wherein Solvent c has a surface tension of about 32 milliNewtons per meter to about 50 milliNewtons per meter. 5. The quantum dot ink composition of claim 2 , wherein the Solvent b-1 comprises 1-ethyl naphthalene, 2-ethyl naphthalene, 1-n-propyl naphthalene, 2-n-propyl naphthalene, 1-n-butyl naphthalene, 2-n-butyl naphthalene, 1-n-pentyl naphthalene, 2-n-pentyl naphthalene, or a combination thereof. 6. The quantum dot ink composition of claim 2 , wherein the Solvent b-2 comprises n-hexyl benzene, n-heptyl benzene, n-octyl benzene, n-nonyl benzene, n-decyl benzene, or a combination thereof. 7. The quantum dot ink composition of claim 1 , wherein the mixed solvent further comprises Solvent c, which is not Solvent a or Solvent b, wherein Solvent c has a surface tension of about 32 milliNewtons per meter to about 50 milliNewtons per meter. 8. The quantum dot ink composition of claim 7 , wherein the Solvent c comprises 1-phenyl naphthalene, benzyl benzoate, n-butyl benzoate, 1-methyl naphthalene, 2-methylbenzophenone, 3-methylbenzophenone, 1′-acetonaphthone, or a combination thereof. 9. The quantum dot ink composition of claim 7 , wherein an amount of the Solvent c in the mixed solvent is greater than or equal to about 5 volume % and less than or equal to about 40 volume % based on the total volume of Solvent a, Solvent b, and Solvent c. 10. The quantum dot ink composition of claim 1 , wherein an amount of the Solvent a in the mixed solvent is greater than or equal to about 30 volume % based on the total volume of Solvent a and Solvent b. 11. The quantum dot ink composition of claim 1 , wherein an amount of the Solvent a in the mixed solvent is less than or equal to about 99 volume % based on the total volume of Solvent a and Solvent b. 12. The quantum dot ink composition of claim 1 , wherein the Solvent a comprises n-decyl cyclohexane, n-undecyl cyclohexane, n-dodecyl cyclohexane, n-tridecyl cyclohexane, or a combination thereof. 13. The quantum dot ink composition of claim 1 , wherein an average particle diameter of the plurality of quantum dots is about 7 nanometers to about 15 nanometers. 14. The quantum dot ink composition of claim 1 , wherein the plurality of quantum dots do not comprise cadmium (Cd) and lead (Pb). 15. The quantum dot ink composition of claim 1 , wherein the surfaces of the plurality of quantum dots are coordinated with at least one organic ligand including a halogenated alkyl compound, a mercapto group-containing compound, or an aliphatic carboxylic acid compound. 16. The quantum dot ink composition of claim 15 , wherein an amount of the at least one organic ligand coordinated to the plurality of quantum dots is about 0.5 weight percent to about 15 weight percent based on the total weight of the plurality of quantum dots and the organic ligand. 17. The quantum dot ink composition of claim 15 , wherein an absolute value of a difference between a solubility parameter of the mixed solvent and a solubility parameter of the organic ligand as defined by [(solubility parameter of the mixed solvent)−(solubility parameter of the organic ligand)] is less than or equal to about 1.5 (cal/cm 3 ) 1/2 . 18. The quantum dot ink composition of claim 1 , wherein the quantum dot ink composition has a photoluminescence quantum yield of about 90% to 100%. 19. A quantum dot electroluminescent device comprising a light emitting layer formed from the quantum dot ink composition according to claim 1 . 20. The quantum dot electroluminescent device of claim 19 , wherein the light emitting layer has a flatness of about 60% to 100%.
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characterised by non-macromolecular additives other than solvents, pigments or dyes · CPC title
comprising active inorganic nanostructures, e.g. luminescent quantum dots · CPC title
with zinc cadmium · CPC title
with zinc or cadmium · CPC title
non-luminescent particle coatings or suspension media · CPC title
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- What does patent US12441901B2 cover?
- A quantum dot ink composition including a plurality of quantum dots, and a mixed solvent including a Solvent a and a Solvent b, the ink composition having a surface tension of about 30 mN/m to about 40 mN/m, where Solvent a is a cycloalkane compound with at least one ring carbon having a linear C4 to C16 alkyl group, and Solvent b is an aromatic hydrocarbon compound having a linear C2 to C12 al…
- Who is the assignee on this patent?
- Samsung Electronics Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C09D11/36. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Oct 14 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).