Granted Patent B2

US 12,448,565 · App. 17/773,090 · Granted Oct 21, 2025

Inventor: Norman Albert Lüchinger (Meilen, CH)

Assignee: Avantama AG

C09K11/664C08F122/10C09K11/06C09K11/623C09K11/70C09K19/3838

Abstract

Claims (92)

1. A self-supporting film having a thickness of 0.005-10 mm comprising

green luminescent crystals

red luminescent crystals, and

a polymer,

wherein the green luminescent crystals are perovskite crystals selected from compounds of formula (I):

[M 1 A 1 ] a M 2 b X c   (I), wherein:

A 1 represents one or more organic cations,

M 1 represents one or more alkaline metals,

M 2 represents one or more metals other than M 1 ,

X represents one or more anions selected from the group consisting of halides, pseudohalides and sulfides,

a represents 1-4,

b represents 1-2,

C represents 3-9, and

wherein either M 1 , or A 1 , or M 1 and A 1 are present;

wherein the red luminescent crystals are zincblende or wurzite, crystals selected from compounds of formula (II)

[M 3 M 3 ′][YY′]  (II), wherein:

M 3 , M 3 ′ represent Al, Ga, In, and

Y, Y′ represent N, P, As, Sb, and

M 3 ′, Y′ may or may not be present,

or

M 3 , M 3 ′ represent Zn, Cd, Be, and

Y, Y′ represent S, Se, Te, and

M 3 ′, Y′ may or may not be present, and

wherein a concentration of M 2 is 5-200 mg/m 2 ,

wherein a concentration of M 3 +M 3 ′ is 30-250 mg/m 2 ,

wherein the polymer comprises an acrylate,

wherein the polymer has a molar ratio of the sum of (oxygen+nitrogen) to carbon z, wherein z≤0.4.

2. The self-supporting film according to claim 1 , having

a haze h 1 of 10≤h 1 ≤80%.

3. The self-supporting film according to claim 1 , comprising scattering particles selected from the group consisting of metal oxide particles and polymer particles.

4. The self-supporting film according to claim 1 , wherein the polymer is sandwiched between two barrier layers.

5. The self-supporting film according to claim 1 , wherein the green luminescent crystals are perovskite crystals of formula (I′):

FAPbBr 3   (I′).

6. The self-supporting film according to claim 1 , wherein the red luminescent crystals are of the core-shell type,

wherein the core is as defined in formula (II) and

wherein the shell comprises compounds of formula (III)

M 4 Z  (III), wherein:

M 4 represents Zn or Cd, and

Z represents S, Se, Te, and wherein

compounds of formula (III) and formula (II) differ.

7. The self-supporting film according to claim 1 , wherein the red luminescent crystals

comprise a core selected from the group consisting of InP and CdSe, and

comprise a shell or a multishell selected from the group consisting of ZnS, ZnSe, ZnSeS, and ZnTe, and combinations thereof.

8. The self-supporting film according to claim 1 , wherein the green luminescent crystals are arranged in a first region of the self-supporting film and the red luminescent crystals are arranged in a second region of the self-supporting film.

9. A solid polymer composition, comprising

green luminescent crystals,

red luminescent crystals, and

a polymer,

wherein the green luminescent crystals are perovskite crystals selected from compounds of formula (I):

[M 1 A 1 ] a M 2 b X c   (I), wherein:

A 1 represents one or more organic cations,

M 1 represents one or more alkaline metals,

M 2 represents one or more metals other than M 1 ,

X represents one or more anions selected from the group consisting of halides, pseudohalides and sulfides,

a represents 1-4,

b represents 1-2,

C represents 3-9, and

wherein either M 1 , or A 1 , or M 1 and A 1 are present;

wherein the red luminescent crystals are zincblende or wurzite, crystals selected from compounds of formula (II)

[M 3 M 3 ′][YY′]  (II), wherein:

M 3 , M 3 ′ represent Al, Ga, In, and

Y, Y′ represent N, P, As, Sb, and

M 3 ′, Y′ may or may not be present,

or

M 3 , M 3 ′ represent Zn, Cd, Be, and

Y, Y′ represent S, Se, Te, and

M 3 ′, Y′ may or may not be present

and

wherein the concentration of M 2 is 100-1000 ppm.

10. The solid polymer composition according to claim 9 , wherein the green luminescent crystals ( 1 ) are perovskite crystals of formula (I′):

FAPbBr 3   (I′).

11. The solid polymer composition according to claim 9 , wherein the red luminescent crystals are of the core-shell type,

and

wherein the shell comprises compounds of formula (III)

M 4 Z  (III), wherein:

M 4 represents Zn or Cd, and

Z represents S, Se, Te, and wherein

compounds of formula (III) and formula (II) differ.

12. The solid polymer composition according to claim 9 , wherein the red luminescent crystals

comprise a core selected from the group consisting of InP and CdSe, and

comprise a shell or a multishell selected from the group consisting of ZnS, ZnSe, ZnSeS, and ZnTe, and combinations thereof.

13. The solid polymer composition according to claim 9 , wherein

the concentration of M 3 +M 3 ′ is 300-2500 ppm, and/or

the red luminescent crystals have a platelet structure.

14. The solid polymer composition according to claim 9 , wherein the polymer comprises an acrylate.

15. The solid polymer composition according to claim 9 , wherein the solid polymer composition has a glass transition temperature T g of T g ≤120° C.

16. The solid polymer composition according to claim 9 , wherein the solid polymer composition comprises scattering particles selected from the group consisting of metal oxide particles and polymer particles.

17. A light emitting device,

comprising the self-supporting film according to claim 1 .

18. The light emitting device according to claim 17 comprising an array of more than one blue LED,

wherein the array of LEDs covers essentially the full liquid crystal display area, and

wherein a diffusor plate is arranged between the array of more than one blue LED and the self-supporting film.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (16)