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 . An optoelectronic device comprising:
a blue light-emitting backlight unit;
an array of pixels in the optical path of the backlight unit, the array of pixels comprising at least one red sub-pixel, at least one green sub-pixel, and at least one blue-sub-pixel; and
a solid film comprising red-emitting quantum dots and a blue light-absorbing material in a red sub-pixel, a solid film comprising green-emitting quantum dots and a blue light-absorbing material in a green sub-pixel, or both,
wherein the blue light-absorbing material preferentially absorbs blue light relative to red light or green light and transfers energy to quantum dots; and
wherein the solid film has an optical density, at a wavelength of 450 nm, that is at least 0.3.
2 . The optoelectronic device of claim 1 , wherein the solid film further comprises scattering particles.
3 . The optoelectronic device of claim 1 , wherein the blue-light absorbing material comprises a coumarin molecule.
4 . The optoelectronic device of claim 1 , wherein the blue light-absorbing material comprises an inorganic material.
5 . The optoelectronic device of claim 1 , wherein the blue light-absorbing material comprises a luminophore.
6 . The optoelectronic device of claim 5 , wherein the blue light-absorbing material is selected from the group consisting of coumarins, rhodamines, fluoresceins, acridines, rubrenes, phosphorescent and fluorescent dopants, fluorescent polymer molecules, semiconductor quantum dots, lanthanide-containing compounds, polycyclic aromatic hydrocarbons, and combinations of two or more thereof.
7 . The optoelectronic device of claim 6 , wherein the phosphorescent and fluorescent dopants are selected from the group consisting of tris[2-phenylpyridinato-C2,N]iridium(III), bis[2-(4,6-difluorophenyl)pyridinato-C2,N](picolinato)iridium(III), platinum octaethylporphyrin, tris-(8-hydroxyquinoline) aluminum, and 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran.
8 . A cured film comprising the polymerization product of an 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 that it preferentially absorbs blue light and transfers energy to quantum dots;
wherein the cured film has an optical density, at a wavelength of 450 nm, that is at least 0.3.
9 . The cured film of claim 8 , wherein the ink composition further comprises an organic solvent at a concentration of up to 84.99 wt. %.
10 . The cured film of claim 8 , wherein the ink composition further comprises 0.1 wt. % to 30 wt. % scattering particles.
11 . The cured film of claim 8 , wherein the blue-light absorbing material comprises a coumarin molecule.
12 . The cured film of claim 8 , wherein the blue light-absorbing material comprises an inorganic material.
13 . The cured film of claim 8 , wherein the blue light-absorbing material comprises a luminophore.
14 . The cured film of claim 13 , wherein the blue light-absorbing material is selected from the group consisting of coumarins, rhodamines, fluoresceins, acridines, rubrenes, phosphorescent and fluorescent dopants, fluorescent polymer molecules, semiconductor quantum dots, lanthanide-containing compounds, polycyclic aromatic hydrocarbons, and combinations of two or more thereof.
15 . The cured film of claim 14 , wherein the phosphorescent and fluorescent dopants are selected from the group consisting of tris[2-phenylpyridinato-C2,N]iridium(III), bis[2-(4,6-difluorophenyl)pyridinato-C2,N](picolinato)iridium(III), platinum octaethylporphyrin, tris-(8-hydroxyquinoline) aluminum, and 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran.
16 . An optoelectronic device comprising:
a blue light source; and
a film in the optical path of the blue light source, the film comprising the polymerization product of an 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 that preferentially absorbs blue light and transfers energy to quantum dots;
wherein the film has an optical density, at a wavelength of 450 nm, that is at least 0.3.
17 . The optoelectronic device of claim 16 , wherein the blue light source is a backlight unit of an optoelectronic display device, and the film is disposed in at least one of a red sub-pixel and a green sub-pixel of the optoelectronic display device.