Composite particles comprising quantum dots and methods of making the same

Patent metadata

Field	Value
Publication number	US-2018371313-A1
Application number	US-201616066845-A
Country	US
Kind code	A1
Filing date	Dec 28, 2016
Priority date	Dec 31, 2015
Publication date	Dec 27, 2018
Grant date	—

Abstract

Composite particles comprising quantum dot light emitters, a nonvolatile liquid ligand system, and hydrolyzed organometallic metal oxide precursor, wherein the quantum dot light emitters and the nonvolatile liquid ligand system are collectively present in the composite particles in an amount of at least 30 weight percent. Composite particles described herein are useful, for example, in films (e.g., remote phosphor diffuser films). Remote phosphor diffuser films are useful, for example, in LCD displays.

First claim

1 . A composite particle comprising:
quantum dot light emitters; a nonvolatile liquid ligand system; and a hydrolyzed organometallic metal oxide precursor,
wherein the quantum dot light emitters and the nonvolatile liquid ligand system are collectively present in the composite particle in an amount of at least 30 weight percent.

2 . The composite particle of claim 1 , wherein the quantum dot light emitters are present in a range from 1 to 30 percent by weight of the quantum dot light emitters and the nonvolatile liquid ligand system.

3 . The composite particle of claim 1 , wherein the hydrolyzed organometallic metal oxide precursor is present in a range from 70 to 30 percent by weight of the composite particle.

4 . The composite particle of claim 1 , wherein the quantum dot light emitters comprise at least one of CdSe cores or InP cores.

5 . The composite particle of claim 1 , wherein the liquid ligand system comprises silicone oil.

6 . The composite particle of claim 1 , wherein the hydrolyzed organometallic metal oxide precursor comprises hydrolyzed metal alkoxide.

7 . The composite particle of claim 6 , wherein the hydrolyzed metal alkoxide is at least one of hydrolyzed zirconium n-propoxide, hydrolyzed tetraethyl orthosilicate, or hydrolyzed titanium isopropoxide.

8 . A plurality of the composite particles of claim 1 .

9 . The plurality of the composite particles of claim 8 that is a grindable powder.

10 . A film comprising the composite particles of claim 8 .

11 . The film of claim 10 having an External Quantum Efficiency of at least 70%.

12 . An article comprising the composite particles of claim 8 in a matrix comprising thiolene.

13 . A method of making composite particles of claim 8 , the method comprising:
combining a mixture of quantum dot light emitters in a liquid ligand system with an organometallic metal oxide precursor; reacting the organometallic metal oxide precursor with water; and at least partially drying the reacted mixture to provide the composite particles.

14 . A method of making composite particles, the method comprising:
combining a mixture of quantum dot light emitters in a liquid ligand system with an organometallic metal oxide precursor; reacting the combination with a mixture of a polyacid and water; and at least partially drying the reacted mixture to provide the composite particles,
wherein the quantum dot light emitters and all material from the liquid ligand system remaining after said reacting and said at least partially drying collectively comprises at least 30 percent by weight of the composite particles.

15 . The method of claim 14 , wherein the polyacid is polyacrylic acid.

16 . The method of claim 14 , wherein the quantum dot light emitters are present in a range from 0.5 to 20 percent by weight of composite particles.

17 . The method of claim 14 , wherein the amount of the organometallic metal oxide precursor reacted is in a range from 70 to 30 percent by weight of the composite particles.

18 . The method of claim 14 , wherein the quantum dot light emitters comprise at least one of CdSe cores or InP cores.

19 . The method of claim 14 , wherein the liquid ligand system comprises silicone oil.

20 . The method of claim 14 , wherein the organometallic metal oxide precursor is a metal alkoxide. plays.

Assignees

• 3M Innovative Properties Co

Inventors

• Aksit Mahmut
• Budd Kenton D
• Sharma Neeraj

Classifications

• C09K11/025 Primary

  non-luminescent particle coatings or suspension media · CPC title

• B82Y20/00

  Nanooptics, e.g. quantum optics or photonic crystals · CPC title

• C09K11/883

  with zinc or cadmium · CPC title

• C09K11/02 Primary

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

• C09K11/70

  containing phosphorus · CPC title