Wavelength converting particle, method for manufacturing wavelength converting particle, and light-emitting diode containing wavelength converting particle

Patent metadata

Field	Value
Publication number	US-10923636-B2
Application number	US-201916578264-A
Country	US
Kind code	B2
Filing date	Sep 20, 2019
Priority date	Nov 6, 2014
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

Provided are a wavelength converting particle, a method for manufacturing a wavelength converting particle, and a light-emitting diode containing a wavelength converting particle. The wavelength converting particle comprises a hybrid OIP nanocrystal that converts a wavelength of light generated by an excitation light source into a specified wavelength. Accordingly, it is possible to optically stabilize and improve color purity and light-emission performance without changes in a light-emitting wavelength range.

First claim

The invention claimed is:

1. A perovskite wavelength-converting layer, the layer comprising:
a wavelength-converting particle comprising one or more nanocrystals of a perovskite material having a nanocrystal size greater than 10 nm and smaller than 300 nm that is configured to absorb light having a first wavelength and to emit light having a second wavelength,
wherein the second wavelength of the light emitted from the perovskite material does not change substantially over the nanocrystal size thereof unlike a quantum dot that substantially changes a wavelength of light emitted therefrom over a nanocrystal size thereof; and
wherein the perovskite material has a crystal structure of A 2 BX 4 , ABX 4 , ABX 3 , or A n−1 B n X 3n+1 (n is an integer ranging from 2 to 6); and
wherein A is organic ammonium or organic cation, B is a metal, and X is a halogen; and
a plurality of ligands attached to the one or more nanocrystals and configured to make the one or more nanocrystals more dispersible than without such ligands in a medium;
a dispersion medium configured to disperse the wavelength-converting nanoparticle; and
wherein the wavelength-converting particle is dispersed in the dispersion medium.

2. The perovskite wavelength-converting layer of claim 1 , wherein the second wavelength of the light emitted from the perovskite material does not change substantially over the nanocrystal size thereof.

3. The perovskite wavelength-converting layer of claim 1 , wherein the dispersion medium is selected from a group consisting of at least one of a polymer, epoxy, and a silicone resin.

4. The perovskite wavelength-converting layer of claim 1 , wherein the dispersion medium is not changed in color by excitation light.

5. The perovskite wavelength-converting layer of claim 1 , wherein the dispersion medium comprises a transparent medium.

6. The perovskite wavelength-converting layer of claim 1 , wherein
A is ((CH 3 NH 3 ) n , ((C x H 2x+1 ) n NH 2 )(CH 3 NH 3 ) n , (RNH 3 ) 2 , (C n H 2n+1 NH 3 ) 2 , (CF 3 NH 3 ), (CF 3 NH 3 ) n , ((C x F 2x+1 ) n NH 2 )(CF 3 NH 3 ) n , ((C x F 2x+1 ) n NH 3 ) 2 , or (C n F 2n+1 NH 3 ) 2 , wherein “n” is an integer greater than or equal to land “x” is an integer greater than or equal to 1;
wherein B is a divalent transition metal, a rare earth metal, an alkaline earth metal, Pb, Sn, Ge, Ga, In, Al, Sb, Bi, Po, or a combination thereof;
“R” is an Alkyl; and
X is Cl, Br, I, or a combination thereof.

7. The perovskite wavelength-converting layer of claim 1 , wherein the wavelength-converting particle is uniformly dispersed in the dispersion medium.

8. A perovskite wavelength-converting body comprising:
a wavelength-converting particle comprising one or more nanocrystals of a perovskite material having a nanocrystal size greater than 10 nm and smaller than 300 nm that is configured to absorb light having a first wavelength and to emit light having a second wavelength,
wherein the second wavelength of the light emitted from the perovskite material does not change substantially over the nanocrystal size thereof unlike a quantum dot that substantially changes a wavelength of light emitted therefrom over a nanocrystal size thereof; and
wherein the perovskite material has a crystal structure of A 2 BX 4 , ABX 4 , ABX 3 , or A n−1 B n X 3n+1 (n is an integer ranging from 2 to 6); and
wherein A is organic ammonium or organic cation, B is a metal, and X is a halogen; and
a plurality of ligands attached to the one or more nanocrystals and configured to make the one or more nanocrystals more dispersible than without such ligands in a medium;
a dispersion medium configured to disperse the wavelength-converting nanoparticle; and
a sealing member that seals the wavelength-converting particle and the dispersion medium,
wherein the wavelength-converting particle is dispersed in the dispersion medium.

9. The perovskite wavelength-converting body of claim 8 , wherein the dispersion medium is in a liquid state.

Assignees

• Postech Acad Ind Found

Inventors

• Lee Tae-Woo
• Kim Younghoon
• Cho Himchan

Classifications

• H10H20/8515

  not being in contact with the bodies · CPC title

• H10H20/8512

  Wavelength conversion materials · CPC title

• H10H20/8513 Primary

  having two or more wavelength conversion materials · CPC title

• H10H20/8514

  characterised by their shape, e.g. plate or foil · CPC title

• G02F1/3551 Primary

  Crystals · CPC title