Quantum dot color filter ink compositions and devices utilizing the same
Liquid ink compositions containing quantum dots for optoelectronic display applications are provided. Also provided are solid films formed by drying the ink compositions, optical elements incorporating the solid films, display devices incorporating the optical elements, and methods of forming the solid films, optical elements, and the devices. Liquid ink compositions and solid films made by drying the liquid ink compositions include one or more blue light-absorbing materials in combination with red light-emitting QDs or green light-emitting QDs.
1. A method of forming a color filter for an optoelectronic device having a blue light source, the method comprising:
depositing an ink composition on a substrate that is in the optical path of the blue light source; and
curing the ink composition into a solid film, the ink composition comprising:
10 wt. % to 94.99 wt. % di(meth)acrylate monomers or a combination of di(meth)acrylate monomers and mono(meth)acrylate monomers;
4 wt. % to 10 wt. % multifunctional (meth)acrylate crosslinking agent;
1 wt. % to 50 wt. % red-emitting quantum dots or green-emitting quantum dots; and
0.01 wt. % to 85 wt. % of a blue light-absorbing material, the blue light-absorbing material characterized in that it preferentially absorbs blue light relative to red light or green light, wherein the solid film has an optical density, at a wavelength of 450 nm, of at least 1.0.
2. The method of claim 1 , wherein the solid film further comprises scattering particles.
3. The method of claim 2 , wherein the blue light-absorbing material comprises organic molecules.
4. The method of claim 3 , wherein the organic molecules comprise coumarin molecules.
5. The method of claim 1 , wherein the blue light-absorbing material comprises an inorganic material.
6. The method of claim 1 , wherein the blue light-absorbing material comprises a luminophor.
7. The method of claim 6 , wherein the blue light-absorbing material is selected from phosphorescent dopant molecules, fluorescent dopant molecules, phosphorescent polymer molecules, fluorescent polymer molecules, semiconductor quantum dots, lanthanide-containing compounds, polycyclic aromatic hydrocarbons, and combinations of two or more thereof.
8. The method of claim 1 , wherein the solid film has an optical density, at a wavelength of 450 nm, of at least 1.3.
9. A method of forming a color filter for an optoelectronic device having a blue light source, the method comprising:
depositing an ink composition on a substrate that is in the optical path of the blue light source; and
curing the ink composition into a solid film having red sub-pixels and green sub-pixels, the ink composition comprising:
10 wt. % to 94.99 wt. % di(meth)acrylate monomers or a combination of di(meth)acrylate monomers and mono(meth)acrylate monomers;
4 wt. % to 10 wt. % multifunctional (meth)acrylate crosslinking agent;
1 wt. % to 50 wt. % red-emitting quantum dots for the red sub-pixels and 1 wt. % to 50 wt. % green-emitting quantum dots for the green sub-pixels; and
0.01 wt. % to 85 wt. % of a blue light-absorbing material, the blue light-absorbing material characterized in that it preferentially absorbs blue light relative to red light or green light, wherein the solid film has an optical density, at a wavelength of 450 nm, of at least 1.0.
10. The method of claim 9 , wherein the blue light-absorbing material is present in each of the red sub-pixels, the green sub-pixels, or both, in a concentration gradient with a higher concentration of the blue light-absorbing material at the light output side of each sub-pixel than at the light input side of the sub-pixel.
11. The method of claim 9 , wherein the blue light absorbing material is one or more components selected from the group consisting of phosphorescent dopant molecules, fluorescent dopant molecules, fluorescent polymer molecules, phosphorescent polymer molecules, and polycyclic aromatic hydrocarbons.
12. The method of claim 9 , wherein the red sub-pixels, the green sub-pixels, or both further comprise scattering particles.
13. The method of claim 9 , wherein the blue light-absorbing material comprises organic molecules.
14. The method of claim 13 , wherein the organic molecules comprise coumarin molecules.
15. The method of claim 9 , wherein the solid film has an optical density, at a wavelength of 450 nm, of at least 1.3.
16. The method of claim 9 , wherein the ink composition further comprises 0.1 wt. % to 30 wt. % scattering particles.
17. The method of claim 9 , wherein the blue light source is a backlight unit of an optoelectronic display device.
18. A method of forming a color filter for an optoelectronic device having a blue light source, the method comprising:
depositing an ink composition on a substrate that is in the optical path of the blue light source to form a first layer containing red-emitting quantum dots, a second layer containing green-emitting quantum dots, and a third layer containing a blue light-absorbing material; and
curing the deposited layers into a solid film having red sub-pixels and green sub-pixels, the ink composition comprising:
10 wt. % to 94.99 wt. % di(meth)acrylate monomers or a combination of di(meth)acrylate monomers and mono(meth)acrylate monomers;
4 wt. % to 10 wt. % multifunctional (meth)acrylate crosslinking agent;
1 wt. % to 50 wt. % red-emitting quantum dots for the red sub-pixels and 1 wt. % to 50 wt. % green-emitting quantum dots for the green sub-pixels; and
0.01 wt. % to 85 wt. % of a blue light-absorbing material, the blue light-absorbing material characterized in that it preferentially absorbs blue light relative to red light or green light, wherein the solid film has an optical density, at a wavelength of 450 nm, of at least 1.0.
19. The method of claim 18 , wherein the ink composition further comprises 0.1 wt. % to 30 wt. % scattering particles.
20. The method of claim 18 , wherein the solid film has an optical density, at a wavelength of 450 nm, of at least 1.3.