Method of preparing luminescent nano-sheet, luminescent nano-sheet material, luminescent nano-sheet film, back light, and liquid crystal display apparatus

Patent metadata

Field	Value
Publication number	US-10421902-B2
Application number	US-201715750281-A
Country	US
Kind code	B2
Filing date	Jun 21, 2017
Priority date	Aug 12, 2016
Publication date	Sep 24, 2019
Grant date	Sep 24, 2019

Abstract

The present application discloses a method of preparing a luminescent nano-sheet. The method includes preparing a precursor emulsion solution containing a metal halide and RNH3X, and having a molar ratio of metal halide to RNH3X in a range of approximately 0.6 to approximately 0.8; demulsifying the precursor emulsion solution to obtain a perovskite quantum dots material and a demulsified solution; and forming the luminescent nano-sheet by allowing the perovskite quantum dots material self-assemble into the luminescent nano-sheet. X is a halide, R is selected from alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl, aryl, heteroaryl, and heterocyclyl.

First claim

What is claimed is:

1. A method of preparing a luminescent nano-sheet, comprising:
preparing a precursor emulsion solution comprising a metal halide and RNH 3 X , and having a molar ratio of metal halide to RNH 3 X in a range of approximately 0.6 to approximately 0.8;
demulsifying the precursor emulsion solution to obtain a perovskite quantum dots material and a demulsified solution; and
forming the luminescent nano-sheet by allowing the perovskite quantum dots material self-assemble into the luminescent nano-sheet;
wherein X is a halide, R is selected from alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl, aryl, heteroaryl, and heterocyclyl;
wherein preparing the precursor emulsion solution comprises:
preparing a RNH 3 X solution in a first solvent, the RNH 3 X solution having a RNH 3 X concentration greater than approximately 0.5 mol/L;
preparing a metal halide solution in a second solvent, each of the second solvent and the first solvent comprises a same polar solvent;
dispensing the RNH 3 X solution and the metal halide solution into an emulsion solution; and
homogenizing a mixture comprising the RNH 3 X solution, the metal halide solution, and the emulsion solution to obtain the precursor emulsion solution.

2. The method of claim 1 , wherein the emulsion solution comprises an organic acid, or an organic amine, or a combination of an organic acid and an organic amine.

3. The method of claim 2 , wherein the emulsion solution comprises n-hexane, an organic acid, and an organic amine.

4. The method of claim 1 , wherein the RNH 3 X solution has a RNH 3 X concentration greater than approximately 1.06 mol/L.

5. The method of claim 1 , wherein demulsifying the precursor emulsion solution comprises demulsifying the precursor emulsion solution with a demulsifier; and
the demulsifier comprises acetone, or C n H 2n+1 OH, n≥1, or a combination thereof.

6. The method of claim 1 , wherein each of the second solvent and the first solvent comprises N, N-dimethylformamide.

7. The method of claim 1 , wherein the metal halide comprises germanium halide, tin halide, lead halide, bismuth halide, copper halide, or manganese halide.

8. The method of claim 1 , wherein the metal halide comprises lead bromide, the RNH 3 X comprises RNH 3 Br, and the luminescent nano-sheet comprises RNH 3 PbBr 3 .

9. A method of preparing a luminescent nano-sheet, comprising;
preparing a precursor emulsion solution comprising a metal halide and RNH 3 X , and having a molar ratio of metal halide to RNH 3 X in a range of approximately 0.6 to approximately 0.8;
demulsifying the precursor emulsion solution to obtain a perovskite quantum dots material and a demulsified solution; and
forming the luminescent nano-sheet by allowing the perovskite quantum dots material self-assemble into the luminescent nano-sheet
wherein X is a halide, R is selected from alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl, aryl, heteroaryl, and heterocyclyl;
wherein forming the luminescent nano-sheet comprises allowing the perovskite quantum dots material to stand in the demulsified solution for a duration equal to or greater than approximately 30 minutes.

10. The method of claim 9 , wherein forming the luminescent nano-sheet comprises allowing the perovskite quantum dots material to stand in the demulsified solution at a temperature in a range of approximately −30 degrees Celsius to approximately 70 degrees Celsius.

11. The method of claim 9 , wherein demulsifying the precursor emulsion solution comprises demulsifying the precursor emulsion solution with a demulsifier; and
the demulsifier comprises acetone, or C n H 2n+1 OH, n≥1, or a combination thereof.

12. The method of claim 9 , wherein the metal halide comprises germanium halide, tin halide, lead halide, bismuth halide, copper halide, or manganese halide.

13. The method of claim 9 , wherein the metal halide comprises lead bromide, the RNH 3 X comprises RNH 3 Br, and the luminescent nano-sheet comprises RNH 3 PbBr 3 .

14. A method of preparing a luminescent nano-sheet, comprising:
preparing a precursor emulsion solution comprising a metal halide and RNH 3 X , and having a molar ratio of metal halide to RNH 3 X in a range of approximately 0.6 to approximately 0.8;
demulsifying the precursor emulsion solution to obtain a perovskite quantum dots material and a demulsified solution;
subsequent to demulsifying the precursor emulsion solution, separating the perovskite quantum dots material from the demulsified solution;
subsequent to separating the perovskite quantum dots material from the demulsified solution, dispersing the perovskite quantum dots material into a non-polar organic solvent; and
allowing the perovskite quantum dots material to stand in the non-polar organic solvent for a duration equal to or greater than approximately 30 minutes to self-assemble into the luminescent nano-sheet;
wherein X is a halide, R is selected from alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl, aryl, heteroaryl, and heterocyclyl.

15. The method of claim 14 , wherein the non-polar organic solvent comprises one or a combination of toluene, n-hexane, n-heptane, cyclohexane, and tetrahydrofuran.

16. The method of claim 14 , wherein dispersing the perovskite quantum dots material into the non-polar organic solvent is performed so that a concentration of the perovskite quantum dots material in the non-polar organic solvent is a range of approximately 1.0 mg/ml to approximately 3.5 mg/ml.

17. The method of claim 14 , wherein demulsifying the precursor emulsion solution comprises demulsifying the precursor emulsion solution with a demulsifier; and
the demulsifier comprises acetone, or C n H 2n+1 OH, n≥1, or a combination thereof.

18. The method of claim 14 , wherein the metal halide comprises germanium halide, tin halide, lead halide, bismuth halide, copper halide, or manganese halide.

19. The method of claim 14 , wherein the metal halide comprises lead bromide, the RNH 3 X comprises RNH 3 Br, and the luminescent nano-sheet comprises RNH 3 PbBr 3 .

Assignees

• Boe Technology Group Co Ltd
• Beijing Institute Tech

Inventors

• Zhong Haizheng
• Liu Lige

Classifications

• C09K11/58

  containing copper, silver or gold · CPC title

• G02F1/13362

  providing polarized light, e.g. by converting a polarisation component into another one · CPC title

• C07F1/08

  Copper compounds · CPC title

• C07F7/24

  Lead compounds · CPC title

• C09K2211/188

  of other metals not provided for in one of the previous groups · CPC title