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-11091693-B2
Application number	US-201916419869-A
Country	US
Kind code	B2
Filing date	May 22, 2019
Priority date	Aug 12, 2016
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

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 luminescent nano-sheet material, comprising a plurality of luminescent nano-sheets comprising RNH 3 MX 3 ;
wherein a thickness of the plurality of luminescent nano-sheets is in a range of approximately 3 nm to approximately 6 nm; and
a width of the plurality of luminescent nano-sheets is in a range of approximately 10 nm to approximately 1000 nm;
wherein X is a halide;
R is selected from alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl, aryl, heteroaryl, and heterocyclyl; and
M is selected from a transition metal, a Group IIIA metal, a Group IVA metal or a Group VA metal;
wherein the luminescent nano-sheet material has an emission peak between approximately 510 nm and approximately 530 nm with a half-width in a range of approximately 20 nm to approximately 30 nm; and
the luminescent nano-sheet material, upon excitation, emits a fluorescent light having a fluorescence quantum yield between approximately 50% and approximately 90%, and a fluorescence life between approximately 25.4 nanoseconds and approximately 40 nanoseconds.

2. The luminescent nano-sheet material of claim 1 , wherein a respective one of the plurality of luminescent nano-sheets has a cubic crystal phase and a Pm3m space group.

3. The luminescent nano-sheet material of claim 1 , wherein a respective one of the plurality of luminescent nano-sheets has a degree of polarization of 0.11 or more upon excitation by a laser light.

4. A luminescent nano-sheet film, comprising:
a transparent organic matrix; and
the luminescent nano-sheet material of claim 1 , dispersed in the transparent organic matrix;
wherein the luminescent nano-sheet material comprises a plurality of luminescent nano-sheets substantially aligned in the transparent organic matrix.

5. The luminescent nano-sheet film of claim 4 , comprising a plurality of pixel areas, each of which comprising a red sub-pixel area, a green sub-pixel area, and a blue sub-pixel area;
the luminescent nano-sheet film in the red sub-pixel area comprises a luminescent nano-sheet prepared from a precursor comprising RNH 3 I;
the luminescent nano-sheet film in the green sub-pixel area comprises a luminescent nano-sheet prepared from a precursor comprising RNH 3 Br; and
the luminescent nano-sheet film in the blue sub-pixel area comprises a luminescent nano-sheet prepared from a precursor comprising RNH 3 Cl.

6. The luminescent nano-sheet film of claim 4 , wherein the transparent organic matrix comprises poly-4-methyl-pentene.

7. A back light, comprising the luminescent nano-sheet film of claim 4 ; and
a laser light source configured to excite the luminescent nano-sheet film to emit light.

8. The back light of claim 7 , wherein the laser light source is a laser light source configured to emit blue light.

9. A liquid crystal display apparatus, comprising the back light of claim 7 ; and
a liquid crystal display panel.

Assignees

• Boe Technology Group Co Ltd
• Beijing Institute Tech

Inventors

• Zhong Haizheng
• Liu Lige

Classifications

• C07F7/22

  Tin compounds · CPC title

• C09K11/06

  containing organic luminescent materials · CPC title

• G02F2202/36

  Micro- or nanomaterials · CPC title

• C09K11/57

  containing manganese or rhenium · CPC title

• C09K11/7428

  Halogenides (C09K11/7407 takes precedence) · CPC title