Display Devices Utilizing Quantum Dots and Inkjet Printing Techniques Thereof

Patent metadata

Field	Value
Publication number	US-2018102449-A1
Application number	US-201715727551-A
Country	US
Kind code	A1
Filing date	Oct 6, 2017
Priority date	Oct 12, 2016
Publication date	Apr 12, 2018
Grant date	—

Abstract

Ink compositions for forming quantum dot-containing films are provided. Also provided are methods for forming the quantum dot-containing films via inkjet printing and photonic devices that incorporate the quantum dot-containing films as light-emitting layers. The ink compositions include the quantum dots, di(meth)acrylate monomers or a combination of di(meth)acrylate and mono(meth)acrylate monomers, and a one or more multifunctional crosslinking agents.

First claim

What is claimed is:

1 . A method of forming a light-emitting layer in a photonic device, the method comprising:
inkjet printing a layer of an ink composition on a device substrate of the photonic device, the curable ink composition comprising:
70 wt. % to 96 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; and
0.1 wt. % to 5 wt. % quantum dots, wherein the ink composition has a viscosity in the range from 2 cps to 30 cps and a surface tension at 22° C. in the range from 25 dyne/cm to 45 dyne/cm at a temperature in the range from 22° C. to 40° C.; and
curing the ink composition.

2 . The method of claim 1 , wherein the ink composition is inkjet printed into a sub-pixel cell of a color filter of a liquid crystal display device.

3 . The method of claim 1 , wherein the device substrate is a light guide plate and the photonic device is a liquid crystal display device.

4 . The method of claim 1 , wherein the ink composition further comprises crosslinkable ligands bound to the quantum dots, the crosslinking ligands having one or more functional groups with polymerizable double bonds capable of crosslinking with the di(meth)acrylate monomers, the mono(meth)acrylate monomers, or both.

5 . The method of claim 1 , wherein the di(meth)acrylate monomers or the combination of di(meth)acrylate monomers and mono(meth)acrylate monomers comprise alkoxylated aliphatic di(meth)acrylate monomers.

6 . The method of claim 5 , wherein the alkoxylated aliphatic di(meth)acrylate monomers comprise propoxylated neopentyl glycol diacrylate monomers.

7 . The method of claim 1 , wherein the di(meth)acrylate monomers comprise 1,6-hexanediol di(meth)acrylate monomers.

8 . The method of claim 1 , wherein the di(meth)acrylate monomers or the combination of di(meth)acrylate monomers and mono(meth)acrylate monomers comprise 1, 12 dodecanediol di(meth)acrylate monomers.

9 . The method of claim 1 , wherein the di(meth)acrylate monomers or the combination of di(meth)acrylate monomers and mono(meth)acrylate monomers comprise polyethylene glycol di(meth)acrylate monomers.

10 . The method of claim 1 , wherein the multifunctional crosslinking agent comprises a tri(meth)acrylate crosslinking agent, a tetra(meth)acrylate crosslinking agent, or a combination thereof.

11 . A photonic device comprising:
a photonic device substrate; and a crosslinked polymer film on the photonic device substrate, the crosslinked polymer film comprising:
70 wt. % to 96 wt. % polymer chains comprising polymerized di(meth)acrylate monomers, or a combination of polymerized di(meth)acrylate monomers and mono(meth)acrylate monomers;
4 wt. % to 10 wt. % polymerized multifunctional (meth)acrylate monomers crosslinking the polymer chains; and
0.1 wt. % to 5 wt. % quantum dots.

12 . The photonic device of claim 11 , wherein the device substrate is a light guide plate and the photonic device is a liquid crystal display device.

13 . The photonic device of claim 11 , wherein the crosslinked polymer film is in a sub-pixel cell of a color filter and the photonic device is a liquid crystal display device.

14 . The photonic device of claim 13 , wherein the color filter comprises:
a plurality of sub-pixel cells defined in a pixel bank; and a plurality of light-emitting sub-pixels, including a plurality of red light-emitting sub-pixels, a plurality of green light-emitting sub-pixels, and a plurality of blue light-emitting sub-pixels; each light-emitting sub-pixel being disposed in one of the sub-pixel cells; wherein each of the red light-emitting sub-pixels comprises: a red light-emitting layer and a local light filter layer comprising a light absorber disposed on a light-emitting surface of the red light-emitting layer; and wherein each of the green light-emitting sub-pixels comprises: a green light-emitting layer and a local light filter layer comprising a light absorber disposed on a light-emitting surface of the green light-emitting layer.

15 . The photonic device of claim 11 , wherein the crosslinked polymer film further comprises ligands bound to the quantum dots, wherein the ligands are crosslinked to the polymer chains.

16 . The photonic device of claim 11 , wherein the polymerized di(meth)acrylate monomers or the combination of polymerized di(meth)acrylate monomers and mono(meth)acrylate monomers comprise polymerized 1,6-hexanediol di(meth)acrylate monomers.

17 . The photonic device of claim 11 , wherein the polymerized di(meth)acrylate monomers or the combination of polymerized di(meth)acrylate monomers and mono(meth)acrylate monomers comprise polymerized propoxylated neopentyl glycol diacrylate monomers.

18 . The photonic device of claim 11 , wherein the polymerized di(meth)acrylate monomers or the combination of polymerized di(meth)acrylate monomers and mono(meth)acrylate monomers comprise polymerized 1,12 dodecanediol di(meth)acrylate monomers.

19 . The photonic device of claim 11 , wherein the polymerized di(meth)acrylate monomers or the combination of polymerized di(meth)acrylate monomers and mono(meth)acrylate monomers comprise polymerized polyethylene glycol di(meth)acrylate monomers.

20 . The photonic device of claim 11 , wherein the polymerized multifunctional (meth)acrylate monomers comprise polymerized tri(meth)acrylate monomers, polymerized tetra(meth)acrylate monomers, or a combination thereof.

21 . A method of forming a light-emitting layer in a photonic device, the method comprising:
inkjet printing a layer of an ink composition on a device substrate of the photonic device, the curable ink composition comprising:
70 wt. % to 96 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; and
0.01 wt. % to 5 wt. % plasmonic scattering particles, wherein the ink composition has a viscosity in the range from 2 cps to 30 cps and a surface tension at 22° C. in the range from 25 dyne/cm to 45 dyne/cm at a temperature in the range from 22° C. to 40° C.; and
curing the ink composition.

22 . The method of claim 21 , wherein the curable ink composition comprises 0.01 wt. % to 1 wt. % plasmonic scattering particles.

23 . The method of claim 21 , wherein the plasmonic scattering particles comprise silver nanoparticles.

24 . A photonic device comprising:
a photonic device substrate; and a crosslinked polymer film on the photonic device substrate, the crosslinked polymer film comprising:
70 wt. % to 96 wt. % polymer chains comprising polymerized di(meth)acrylate monomers, or a combination of polymerized di(meth)acrylate monomers and mono(meth)acrylate monomers;
4 wt. % to 10 wt. % polymerized multifunctional (meth)acrylate monomers crosslinking the polymer chains; and
0.01 wt. % to 5 wt. % plasmonic scattering particles.

25 . The photonic device of claim 24 , wherein the curable ink composition comprises 0.01 wt. % to 1 wt. % plasmonic scattering particles.

26 . The photonic device of claim 24 , wherein the plasmonic scattering particles comprise silver nanoparticles.

Assignees

• Kateeva Inc

Inventors

• Pschenitzka Florian
• Chen Jianglong
• Rogojina Elena
• Van Slyke Steven
• Madigan Conor F

Classifications

• G02F2202/36

  Micro- or nanomaterials · CPC title

• G02F1/133617

  Illumination with ultraviolet light; Luminescent elements or materials associated to the cell · CPC title

• G02F1/133528

  Polarisers · CPC title

• C09K11/02

  Use of particular materials as binders, particle coatings or suspension media therefor · CPC title

• G02F2203/055

  wavelength filtering · CPC title