Quantum dot formulations with thiol-based crosslinkers for uv-led curing

Patent metadata

Field	Value
Publication number	US-2022029068-A1
Application number	US-202117380998-A
Country	US
Kind code	A1
Filing date	Jul 20, 2021
Priority date	Jul 24, 2020
Publication date	Jan 27, 2022
Grant date	—

Abstract

A photocurable composition includes a nanomaterial selected to emit radiation in a first wavelength band in the visible light range in response to absorption of radiation in a second wavelength band in the UV or visible light range. The second wavelength band is different than the first wavelength band. The photocurable composition further includes one or more (meth)acrylate monomers, a thiol crosslinker, and a photoinitiator that initiates polymerization of the one or more (meth)acrylate monomers in response to absorption of radiation in the second wavelength band. A light-emitting device includes a plurality of light-emitting diodes and the cured photocurable composition in contact with a surface through which radiation in a first wavelength band in the UV or visible light range is emitted from each of the light-emitting diodes

First claim

What is claimed is:

1 . A photocurable composition comprising:
a nanomaterial selected to emit radiation in a first wavelength band in the visible light range in response to absorption of radiation in a second wavelength band in the UV or visible light range, wherein the second wavelength band is different than the first wavelength band; one or more (meth)acrylate monomers; a thiol crosslinker; and a photoinitiator that initiates polymerization of the one or more (meth)acrylate monomers in response to absorption of radiation in the second wavelength band.

2 . The composition of claim 1 , wherein the thiol crosslinker comprises a mono-thiol, a di-thiols, a tri-thiols, a multi-thiols, or any combination thereof.

3 . The composition of claim 2 , wherein the thiol crosslinker is aliphatic or aromatic.

4 . The composition of claim 3 , wherein the thiol crosslinker comprises a mono-thiol, and the mono-thiol comprises ethanethiol, propanethiols, butanethiols, pentanethiols, thiophenols, dimercaptosuccinic acid, thioacetic acid, glutathione, cysteine, mercaptoethanols, dithiothreitol/dithioerythritol, 2-mercaptoindole, furan-2-ylmethanethiol, 3-mercaptopropane-1,2-diol, 3-mercapto-1-propanesulfonic acid, 1-hexadecanethiol, or pentachlorobenzenethiol.

5 . The composition of claim 3 , wherein the thiol crosslinker comprises a di-thiol, and the di-thiol comprises a 1,1-dithiol, a 1,2-dithiol, ora 1,3-dithiol.

6 . The composition of claim 5 , wherein the thiol crosslinker comprises a 1,1-dithiol, and the 1,1-dithiol comprises methanedithiol, 1,1-ethanedithiol, or 1,1-cyclohexanedithiol.

7 . The composition of claim 5 , wherein the thiol crosslinker comprises a 1,2-dithiol, and the 1,2-dithiol comprises 1,3-propanedithiol or 1,2-ethanedithiol.

8 . The composition of claim 5 , wherein the thiol crosslinker comprises a 1,3-di-thiol, and the 1,3-dithiol comprises dihydrolipoic acid.

9 . The composition of claim 3 , wherein the thiol crosslinker comprises a tri-thiol, and the tri-thiol comprises trithiocyanuric acid, trimethylolpropane tris(3-mercaptopropionate), or tris[2-(3-mercapto-propionyloxy)ethyl] isocyanurate

10 . The composition of claim 3 , wherein the thiol crosslinker comprises a multi-thiol, and the multi-thiol comprises pentaerythritol tetrakis(2-mercaptoacetate) and pentaerythritol tetrakis(3-mercaptopropionate).

11 . The composition of claim 1 , wherein the composition comprises:
about 0.1 wt % to about 10 wt % of the nanomaterial; about 0.5 wt % to about 5 wt % of the photoinitiator; about 0.1 wt % to about 50 wt % of the thiol crosslinker; and about 1 wt % to about 90 wt % of the one or more (meth)acrylate monomers.

12 . The composition of claim 1 , wherein the composition further comprises a solvent.

13 . The composition of claim 12 , wherein the composition comprises:
about 0.1 wt % to about 10 wt % of the nanomaterial; about 0.5 wt % to about 5 wt % of the photoinitiator; about 0.1 wt % to about 50 wt % of the thiol crosslinker; about 1 wt % to about 10 wt % of the one or more (meth)acrylate monomers; and about 10 wt % to about 90 wt % of the solvent.

14 . The composition of claim 1 , wherein the nanomaterial comprises one or more III-V compounds.

15 . The composition of claim 14 , wherein the nanomaterial comprises quantum dots.

16 . The composition of claim 15 , wherein each of the quantum dots comprises one or more ligands coupled to an exterior surface of the quantum dot, wherein the ligands are selected from the group consisting of thioalkyl compounds and carboxyalkanes.

17 . The composition of claim 1 , wherein the nanomaterial emits red, green or blue light.

18 . The composition of claim 1 , wherein the thiol crosslinker is of sufficient concentration to inhibit formation of peroxyl radicals by oxygen such that polymerization of the one or more (meth)acrylate monomers in response to absorption of radiation in the second wavelength band results in a photopolymer have a cure percentage of at least 70% throughout a depth of the photopolymer.

19 . A light-emitting device comprising:
a plurality of light-emitting diodes; and a cured composition in contact with a surface through which radiation in a first wavelength band in the UV or visible light range is emitted from each of the light-emitting diodes, wherein the cured composition comprises:
a nanomaterial selected to emit radiation in a second wavelength band in the visible light range in response to absorption of the radiation in the first wavelength band from each of the light-emitting diodes; and
a photopolymer comprising a thiol crosslinker, wherein the nanomaterial is embedded in the photopolymer.

20 . The light emitting device of claim 19 , wherein a top cure percentage of the photopolymer is at least 70%

21 . The light emitting device of claim 19 , wherein the photopolymer is cured by absorption of a radiation dosage of at least 0.6 J/cm 2 in the first wavelength band.

Assignees

• Applied Materials Inc

Inventors

• Luo Yingdong
• Ganapathiappan Sivapackia
• Zhang Daihua
• Ng Hou T
• Patibandla Nag B

Classifications

• H10W90/00

  Package configurations · CPC title

• H10H20/8511

  characterised by their material, e.g. binder · CPC title

• G03F7/0275

  with dithiol or polysulfide compounds · CPC title

• G03F7/0047

  characterised by additives for obtaining a metallic or ceramic pattern, e.g. by firing · CPC title

• C09K11/025 Primary

  non-luminescent particle coatings or suspension media · CPC title