Granted Patent B2

US 12,696,594 · App. 18/108,572 · Granted Jul 28, 2026

Inventors: Tae-woo Lee (Seoul, KR); Younghoon Kim (Seoul, KR); Himchan Cho (Seoul, KR)

Assignee: SN DISPLAY CO., LTD.

H10H20/8513C09K11/025C09K11/06H10H20/8512H10K85/50C09K2211/188H10H20/8514H10H20/8515

Abstract

Claims (35)

1 . A light-emitting device comprising:

a base structure;

at least one excitation light source disposed on the base structure and configured to emit light of a predetermined wavelength; and

a wavelength-converting layer disposed along an optical path of the excitation light source and including a plurality of wavelength-converting particles which comprise:

one or more nanocrystals of a perovskite material 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;

a plurality of ligands attached to the one or more nanocrystals;

a dispersion medium configured to disperse the wavelength-converting particles; and

a sealing member that seals the wavelength-converting particles and the dispersion medium,

wherein the wavelength-converting particles are dispersed in the dispersion medium.

2 . The light-emitting device of claim 1 , wherein the base structure is a light-emitting diode wafer.

3 . The light-emitting device of claim 1 , wherein the base structure is a sub-mount substrate.

4 . The light-emitting device of claim 1 , 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

A is organic ammonium or organic cation, B is a metal, and X is a halogen.

5 . The light-emitting device of claim 4 , 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 1 and “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 CI, Br, I, or a combination thereof.

6 . The light-emitting device of claim 1 , wherein the at least one excitation light source is at least one selected from the group consisting of a light-emitting diode (LED) and a laser diode, and

wherein the at least one excitation light source emits blue light of a wavelength ranging from 420 nm to 480 nm.

7 . The light-emitting device of claim 1 ,

wherein the plurality of ligands are configured to make the one or more nanocrystals more dispersible than without such ligands in a medium.

8 . The light-emitting device of claim 1 ,

wherein the one or more nanocrystals of a perovskite material have a nanocrystal size greater than 10 nm and smaller than 300 nm.

9 . A light-emitting diode comprising:

a base structure;

at least one excitation light source disposed on the base structure and configured to emit light of a predetermined wavelength; and

a wavelength-converting layer disposed along an optical path of the excitation light source and including a plurality of wavelength-converting particles which comprise:

one or more nanocrystals of a perovskite material 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;

a plurality of ligands attached to the one or more nanocrystals;

a dispersion medium configured to disperse the wavelength-converting particles; and

a sealing member that seals the wavelength-converting particles and the dispersion medium,

wherein the wavelength-converting particles are dispersed in the dispersion medium, and

wherein the plurality of ligands are configured to make the one or more nanocrystals more dispersible than without such ligands in a medium.

Assignments (2)

Priority Claims (1)

Continuity (4)

References Cited (80)