US 2022/0102660 A1 · DEFECT SUPPRESSED METAL HALIDE PEROVSKITE LIGHT-EMITTING MATERIAL AND LIGHT-EMITTING DIODE COMPRISING THE SAME

Abstract

Disclosed are a metal halide perovskite light-emitting material with controlled defects and wavelength converting body having the same, and light-emitting device. Monvalent organic cation (A2) contained in the perovskite nanocrystal can stabilize the perovskite nanocrystal and suppress the generation of defects in the crystal due to the entropy effect. Remnant A2 cations not included in the perovskite nanocrystal form a structure surrounding the perovskite nanocrystal particles, and passivate defects generated on the surface of the perovskite nanocrystal particles. Photoluminescence quantum efficiency, photoluminescence lifetime, and stability are improved through passivation of defects, and the metal halide perovskite light-emitting material can be effectively used in a light-emitting layer or a wavelength conversion layer of a light-emitting device.

Claims20

Dependent claims

A Perovskite light-emitting material comprising perovskite crystal having structure of ABX3 (3D), A4BX6 (0D), AB2X5 (2D), A2BX4 (2D), A2BX6 (0D), A2B+B3+X6 (3D), A3B2X9 (2D) or An−1BnX3n+1 (quasi-2D) (n is an integer between 2 and 6), where A is a monovalent cation, B is a metal material, and X is a halogen element,

wherein when tolerance factor (t) is defined as
t
=
R
A
+
R
X
2
⁢
(
R
B
+
R
X
)
(RA, RB and RX are respectively the ionic radius of A, B, X), structure having a first monovalent cation (A1) capable of making the tolerance factor as 1.01 or less at the site A of the perovskite structure, and structure having a second monovalent cation (A2) capable of making the tolerance factor of equal to or greater than 1.01 and less than 3 are mixed in the perovskite crystal,
wherein the second monovalent cation is simultaneously included both in the A site of inner structure of the perovskite crystal and outer surface of the perovskite crystal.

16 more elements

wherein when tolerance factor (t) is defined as
t
=
R
A
+
R
X
2
⁢
(
R
B
+
R
X
)
(RA, RB and RX are respectively the ionic radius of A, B, X), a structure having a first monovalent cation (A1) capable of making the tolerance factor as 1.01 or less at the site A of the perovskite structure, and a structure having a second monovalent cation (A2) capable of making the tolerance factor equal to or greater than 1.01 and less than 3 are mixed in the perovskite crystal,
wherein the first monovalent cations and the second monovalent cation are uniformly positioned at the A site of inner structure of the perovskite crystal.

16 more elements

Dependencies are inferred from the claim text.

Defect suppressed metal halide perovskite light-emitting material and light-emitting diode comprising the same

Life of this patent

Defect suppressed metal halide perovskite light-emitting material and light-emitting diode comprising the same

Life of this patent

Abstract

Claims20