Ink compositions with narrow band emission phosphor materials

Patent metadata

Field	Value
Publication number	US-11312876-B2
Application number	US-202117152736-A
Country	US
Kind code	B2
Filing date	Jan 19, 2021
Priority date	Apr 14, 2020
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

An ink composition is provided. The composition includes a binder material and at least one narrow band emission phosphor being uniformly dispersed throughout the composition, wherein the narrow band emission phosphor has a D50 particle size from about 0.1 μm to about 15 μm and is selected from the group consisting of a green-emitting U6+-containing phosphor, a green-emitting Mn2+-containing phosphor, a red-emitting phosphor based on complex fluoride materials activated by Mn4+, and a mixture thereof. A device is also provided.

First claim

What is claimed is:

1. An ink composition comprising a binder material and at least one narrow band emission phosphor being uniformly dispersed throughout the composition, the narrow band emission phosphor having a D50 particle size from about 0.1 μm to about 15 μm and is selected from the group consisting of a green-emitting U 6+ -containing phosphor, a green-emitting Mn 2+ -containing phosphor, a red-emitting phosphor based on complex fluoride materials activated by Mn 4+ , and a mixture thereof, wherein the binder material comprises at least one of an epoxy-based thermoset binder precursor, a photoresist material or a UV curable precursor.

2. The ink composition according to claim 1 , wherein the binder material comprises a UV-curable precursor material with mono-functional groups, bi-functional groups or multi-functional groups.

3. The ink composition according to claim 1 , wherein the at least one narrow band emission phosphor has a D50 particle size from about 0.1 μm to about 10 μm.

4. The ink composition according to claim 1 , wherein the at least one narrow band emission phosphor is a combination of a green-emitting U 6+ -containing phosphor and a red-emitting phosphor based on complex fluoride materials activated by Mn 4+ .

5. The ink composition according to claim 1 , wherein the composition has a viscosity ranging from at least 15 cP at 25° C. to less than 20 cP at 50° C.

6. The ink composition according to claim 1 further comprising a solvent.

7. The ink composition according to claim 6 , wherein the solvent is selected from the group consisting of: Bis(2-ethylhexyl) phosphate, dibutyl phosphate, ethylene glycol phenyl ether methacrylate, isobutyric acid, isobornyl acrylate, isopropanol, propylene glycol methyl ether acetate, polypropylene glycol dimethacrylate, terpineol, triethylene glycol dimethacrylate, water, 2-(2-Butoxyethoxy)ethyl acetate, 2,2,3,3-tetrafluoro-1-propanol, cyclohexanone, diethylene glycol methyl ether, toluene and mixtures thereof.

8. The ink composition according to claim 1 , wherein the composition further comprises quantum dot materials or color filter pigments capable of absorbing blue light.

9. The ink composition according to claim 1 further comprising one of more additives selected from the group consisting of: a dispersant, a rheology modifier, an electrolyte, metal oxide nanoparticles, scattering particles and mixtures thereof.

10. The ink composition according to claim 1 , wherein the binder material comprises metal oxide nanoparticles.

11. The ink composition according to claim 9 , wherein the rheology modifier comprises a gelator.

12. The ink composition according to claim 9 , wherein the scattering particles have a particle size greater than 1 μm and are selected from the group consisting of: Al 2 O 3 , zirconium oxide, indium tin oxide, cerium oxide, tantalum oxide, titanium dioxide, zinc oxide and a combination thereof.

13. The ink composition according to claim 9 , wherein the metal oxide nanoparticles are selected from the group consisting of: zirconium oxide, indium tin oxide, cerium oxide, tantalum oxide, titanium dioxide, zinc oxide and a combination thereof.

14. The ink composition according to claim 1 , wherein the at least one narrow band emission phosphor comprises a green-emitting U 6+ -containing phosphor selected from the group consisting of γ-Ba 2 UO 2 (PO 4 ) 2 , Ba[Mg,Zn]UO 2 (PO 4 ) 2 , Ba 6 Al 5 P 5 O 26 :U 6+ , Ba(UO 2 )P 2 O 7 , Ba 3 (UO 2 ) 2 P 2 O 7 (PO 4 ) 2 , and combinations thereof.

15. The ink composition according to claim 1 , wherein the at least one narrow band emission phosphor comprises a red phosphor of formula I
A x (MF y ):Mn +4   (I)

wherein
A is Li, Na, K, Rb, Cs, or a combination thereof;
M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or a combination thereof;
x is an absolute value of a charge of the MF y ion; and
y is 5, 6 or 7.

16. The ink composition according to claim 1 , wherein the at least one narrow band emission phosphor comprises K 2 SiF 6 :Mn 4+ or Na 2 SiF 6 :Mn 4+ .

17. The ink composition according to claim 15 , wherein the binder material has a higher refractive index than the red phosphor.

18. The ink composition according to claim 15 , wherein the red phosphor is at least partially coated with a surface coating comprising a metal fluoride or a silica.

19. The ink composition according to claim 18 , wherein the metal fluoride is selected from the group consisting of MgF 2 , CaF 2 , SrF 2 , BaF 2 , AgF, ZnF 2 , AlF 3 , and a combination thereof.

20. A device comprising an LED light source optically coupled and/or radiationally connected to the ink composition according to claim 1 , wherein the ink composition is cured or dried.

21. A backlight apparatus comprising the device according to claim 20 .

22. A lighting apparatus comprising the device according to claim 20 .

23. A television comprising the backlight apparatus of claim 21 .

24. A mobile phone comprising the backlight apparatus of claim 21 .

25. A computer monitor comprising the backlight apparatus of claim 21 .

26. The device according to claim 20 , wherein the LED light source comprises a mini-LED or a micro-LED.

27. The ink composition according to claim 2 , wherein the UV-curable precursor material comprises acrylic resins, acrylate resins or urethane-based materials.

28. An ink composition comprising a binder material and at least one narrow band emission phosphor being uniformly dispersed throughout the composition, the narrow band emission phosphor having a D50 particle size from about 0.1 μm to less than about 15 μm and is selected from the group consisting of a green-emitting U 6+ containing phosphor, a green-emitting Mn 2+ -containing phosphor, a red-emitting phosphor based on complex fluoride materials activated by Mn 4+ , and a mixture thereof, wherein the red-emitting phosphor is at least partially coated with a surface coating comprising a metal fluoride or a silica, and wherein the ink composition is for printing, has a viscosity ranging from at least 15 cP at 25° C. to less than 20 cP at 50° C. and a sedimentation speed of 1.00 mm per hour or less.

29. A method for preparing the ink composition according to claim 1 , the method comprising combining a binder material and at least one narrow band emission phosphor, wherein the narrow band emission phosphor is uniformly dispersed throughout the composition, the narrow band emission phosphor having a D50 particle size from about 0.1 μm to about 15 μm and is selected from the group consisting of a green-emitting U 6+ -containing phosphor, a green-emitting Mn 2+ -containing phosphor, a red-emitting phosphor based on complex fluoride materials activated by Mn 4+ , and a mixture thereof, wherein the binder material comprises at least one of an epoxy-based thermoset binder precursor, a photoresist material or a UV curable precursor.

Assignees

• Gen Electric

Inventors

• Doherty Mark D
• Liang Yangang
• Liu Jie Jerry
• Camardello Samuel Joseph
• Murphy James Edward

Classifications

• H10H20/8513 Primary

  having two or more wavelength conversion materials · CPC title

• H10H20/882

  Scattering means (H10H20/82 takes precedence) · CPC title

• H10H20/8512

  Wavelength conversion materials · CPC title

• H10H20/8514

  characterised by their shape, e.g. plate or foil · CPC title

• C09D11/50

  Sympathetic, colour changing or similar inks · CPC title