Color conversion particle

Patent metadata

Field	Value
Publication number	US-12565612-B2
Application number	US-202118038688-A
Country	US
Kind code	B2
Filing date	Nov 24, 2021
Priority date	Nov 25, 2020
Publication date	Mar 3, 2026
Grant date	Mar 3, 2026

Abstract

A color conversion particle includes a core; and a shell that contains the core and absorbs excitation light, and emits light at the core or at an interface between the core and the shell upon receiving the irradiated excitation light. The shell is composed of a chalcogenide perovskite, and the core and the shell have band alignment that induces a Stokes shift.

First claim

The invention claimed is:

1 . A color conversion particle comprising:
a core; and a shell that contains the core and absorbs excitation light, wherein light is emitted at the core or at an interface between the core and the shell upon receiving the irradiated excitation light, the shell is composed of a chalcogenide perovskite, and the core and the shell have band alignment that induces a Stokes shift.

2 . The color conversion particle according to claim 1 , wherein
the chalcogenide perovskite has a crystal structure of any one of crystal structures of a cubic perovskite, a tetragonal perovskite, a GdFeO 3 orthorhombic perovskite, a Ruddlesden-Popper layered perovskite, a Dion-Jacobson layered perovskite, and a double perovskite.

3 . The color conversion particle according to claim 1 , wherein
the chalcogenide perovskite has a chemical formula of ABX 3 or A′ 2 A n−1 B n X 3n+1 , wherein A and A′ are Group 2 elements, B is a Group 4 element, X is a chalcogen element, and n is an integer of 1 or more.

4 . The color conversion particle according to claim 3 , wherein
the A, the A′, the B, and the X include a mixture of elements of respective groups at any ratio.

5 . The color conversion particle according to claim 1 , wherein
the chalcogenide perovskite is selected from any one of SrZrS 3 , SrZrSe 3 , SrHfS 3 , SrHfSe 3 , BaZrS 3 , BaZrSe 3 , BaHfS 3 , BaHfSe 3 , Sr 2 Ba n−1 Zr n S 3n+1 , Sr 2 Ba n−1 Zr n Se 3n+1 , Sr n+1 Zr n S 3n+1 , Sr n+1 Zr n Se 3n+1 , Ba 2 Sr n−1 Zr n S 3n+1 , Ba 2 Sr n−1 Zr n Se 3n+1 , Ba n+1 Zr n S 3n+1 , Ba n+1 Zr n Se 3n+1 , Sr 2 Ba n−1 Hf n S 3n+1 , Sr 2 Ba n−1 Hf n Se 3n+1 , Sr n+1 Hf n S 3n+1 , Sr n+1 Hf n Se 3n+1 , Ba 2 Sr n−1 Hf n S 3n+1 , Ba 2 Sr n−1 Hf n Se 3n+1 , Ba n+1 Hf n S 3n+1 , and Ba n+1 Hf n Se 3n+1 , wherein n is an integer of 1 or more.

6 . The color conversion particle according to claim 1 , wherein
the chalcogenide perovskite is (Sr x Ba 1−x )(Zr y Hf 1−y )(S z Se 1−z ) 3 or (Sr x′ Ba 1−x′ ) 2 (Sr x Ba 1−x ) n−1 (Zr y Hf 1−y ) n (S z Se 1−z ) 3n+1 , wherein each of x, x′, y, z is a value from 0 to 1, and n is an integer of 1 or more.

7 . The color conversion particle according to claim 1 , wherein
the band alignment satisfies at least one of a condition that energy E c_shell at a lower end of a conduction band of the shell is higher than energy E c_core at a lower end of a conduction band of the core and a condition that energy E v_shell at an upper end of a valence band of the shell is lower than energy E v_core at an upper end of a valence band of the core.

8 . The color conversion particle according to claim 7 , wherein
a band gap of the shell is greater than a band gap of the core.

9 . The color conversion particle according to claim 8 , wherein
the band alignment satisfies a condition that energy E c_shell at a lower end of a conduction band of the shell is higher than energy E c_core at a lower end of a conduction band of the core and energy E v_shell at an upper end of a valence band of the shell is lower than energy E v_core at an upper end of a valence band of the core.

10 . The color conversion particle according to claim 1 , wherein
a band gap of the shell is 3.4 eV or less.

11 . The color conversion particle according to claim 1 , wherein
a thickness of the shell is 2 nm or more and 300 nm or less.

12 . The color conversion particle according to claim 11 , wherein
a thickness of the shell is 2 nm or more and 50 nm or less.

13 . The color conversion particle according to claim 12 , wherein
a thickness of the shell is 2 nm or more and 30 nm or less.

14 . The color conversion particle according to claim 12 , wherein
a thickness of the shell is 2 nm or more and 10 nm or less.

15 . The color conversion particle according to claim 1 , wherein
the shell has a plurality of layers.

16 . The color conversion particle according to claim 1 , wherein
the shell has a plurality of the cores.

17 . The color conversion particle according to claim 1 , wherein
the core contains a light absorbing material.

18 . The color conversion particle according to claim 1 , wherein
at least one of the shell or the core includes a foreign substance that does not both absorb and emit light.

19 . The color conversion particle according to claim 1 , wherein
at least one of the shell and the core has a structure in which physical properties change in a gradient manner in a depth direction.

20 . A powder comprising the color conversion particle according to claim 1 .

21 . A solution comprising the color conversion particle according to claim 1 .

22 . A thin film comprising the color conversion particle according to claim 1 .

23 . A sheet comprising the color conversion particle according to claim 1 .

24 . A device comprising the color conversion particle according to claim 1 .

25 . The color conversion particle according to claim 1 ,
wherein the chalcogenide perovskite is represented by a formula selected from the group consisting of ABX 3 , A′ 2 A n−1 B n X 3n+1 , A″A′″B″ 2 X 7 , A″A 2 B″ 3 X 10 , and A 2 BB′X 6 , wherein X represents S, Se, and Te, A and A′ represent Ca, Sr, and Ba, A″ represents Li, Na, K, Rb, and Cs, and A′″ represents rare earth elements and Bi, B and B′ represent Ti, Zr, and Hf, B″ represents V, Nb, and Ta, and n is a positive integer, wherein A and A′ may be the same element, B and B′ may be the same element, and A, A′, A″, A′″, B, B′, B″, and X include mixtures of each element at any ratio.

26 . The color conversion particle according to claim 1 ,
wherein the core includes one or more voids.

27 . The color conversion particle according to claim 1 , wherein further comprising an outer shell outside the shell, and
a void is formed between the shell and the outer shell.

Assignees

• Idemitsu Kosan Co

Inventors

• Kato Takuya
• INATOME Toru
• HIGASHINO Yuta
• Oda Yusuke
• Kimoto Yoshinori

Classifications

• C09K11/567

  with alkaline earth metals · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• B82Y20/00

  Nanooptics, e.g. quantum optics or photonic crystals · CPC title

• B82B3/0095

  Manufacture or treatments or nanostructures not provided for in groups B82B3/0009 - B82B3/009 · CPC title

• G02B5/20

  Filters (polarising elements G02B5/30) · CPC title