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CN-114729260-B - Solid polymer composition, self-supporting film and light-emitting device

CN114729260BCN 114729260 BCN114729260 BCN 114729260BCN-114729260-B

Abstract

The invention relates in a first aspect to a solid polymer composition (100) comprising green luminescent crystals (1), non-perovskite red phosphor particles, and a polymer (3). The molar ratio of the sum of (oxygen+nitrogen) of the polymers (3) to carbon is z, where z≤0.9, z≤0.75, in particular z≤0.4, in particular z≤0.3, in particular z≤0.25. A second aspect of the invention relates to a self-supporting film comprising the solid polymer composition (100) of the first aspect. A third aspect of the invention relates to a light emitting device comprising a solid polymer composition (100) according to the first aspect of the invention, or a self-supporting film according to the second aspect of the invention.

Inventors

  • N. A. luchinger

Assignees

  • 凡泰姆股份公司

Dates

Publication Date
20260512
Application Date
20210528
Priority Date
20200529

Claims (17)

  1. 1. A solid polymer composition (100) comprising: green luminescent perovskite crystals (1), Non-perovskite red phosphor particles (2), -Scattering particles, and A polymer (3), Wherein the green luminescent perovskite crystal (1) is of formula (I'): FAPbBr 3 (I’) wherein the non-perovskite red phosphor particle (2) is a Mn +4 doped phosphor particle of formula (II'): K 2 SiF 6 :Mn 4+ (II’) wherein the molar ratio of the sum of (oxygen+nitrogen) of the polymer (3) to carbon is z, wherein z≤0.4, Wherein the volume weighted average particle size s p of the non-perovskite red phosphor particles (2) is s p ≤10 μm, and Wherein the scattering particles are selected from the group consisting of metal oxide particles and polymer particles.
  2. 2. The solid polymer composition (100) according to claim 1, wherein the green-emitting perovskite crystals and the non-perovskite red phosphor particles are embedded in the polymer without encapsulation.
  3. 3. A solid polymer composition (100) according to any one of claims 1 to 2, wherein the concentration difference Δc Mn of Mn between the centre of each non-perovskite red phosphor particle (2) and the 100nm region below the surface of the respective red phosphor particle is Δc Mn +≤50%.
  4. 4. A solid polymer composition (100) according to any of the preceding claims 1 to 2, wherein the concentration c Mn of Mn in each non-perovskite red phosphor particle (2) is uniform over the volume of the respective non-perovskite red phosphor particle.
  5. 5. A solid polymer composition (100) according to any one of claims 1 to 2, wherein the non-perovskite red phosphor particles (2) are free of inorganic surface coating.
  6. 6. A solid polymer composition (100) according to any one of claims 1 to 2, wherein the non-perovskite red phosphor particles (2) are free of an inorganic surface coating having a composition different from the composition of the core of each non-perovskite red phosphor particle (2).
  7. 7. The solid polymer composition (100) according to any one of claims 1 to 2, wherein the Mn concentration c Mn of the non-perovskite red phosphor particle (2) is c Mn ≡6mol%.
  8. 8. The solid polymer composition (100) according to any one of claims 1 to 2, wherein the polymer (3) comprises an acrylate.
  9. 9. The solid polymer composition (100) according to any one of claims 1 to 2, wherein the polymer (3) comprises a cycloaliphatic acrylate.
  10. 10. The solid polymer composition (100) according to any one of claims 1 to 2, wherein the glass transition temperature T g of the solid polymer composition (100) is T g +.120 ℃.
  11. 11. The solid polymer composition (100) according to any one of claims 1 to 2, wherein the solid polymer composition (100) comprises scattering particles selected from polymer particles.
  12. 12. The solid polymer composition (100) according to any one of claims 1 to 2, wherein the solid polymer composition (100) comprises scattering particles selected from organopolysiloxanes.
  13. 13. A self-supporting film comprising a solid polymer composition (100) according to any one of claims 1 to 12.
  14. 14. A self-supporting film according to claim 13, wherein the solid polymer composition (100) is sandwiched between two barrier layers (4).
  15. 15. A light emitting device comprising the solid polymer composition (100) according to any one of claims 1-12, or comprising the self-supporting film according to claim 13 or 14.
  16. 16. The light emitting device of claim 15, which is a Liquid Crystal Display (LCD).
  17. 17. The light emitting device according to claim 15 or 16, comprising an array (6) of more than one blue LED, Wherein the array of LEDs (6) covers the entire liquid crystal display area (5), and Wherein a diffuser plate is arranged between the array (6) of more than one blue LED and the self-supporting film.

Description

Solid polymer composition, self-supporting film and light-emitting device Technical Field The present invention relates in a first aspect to a solid polymer composition, in a second aspect to a self-supporting film, and in a third aspect to a light emitting device. Background The prior art Liquid Crystal Displays (LCDs) or display components comprise components based on light emitting crystals (quantum dots). In particular, the backlight unit of such an LCD may include RGB backlight consisting of red light, blue light and green light. Currently, typical luminescent crystals (quantum dots) are used to produce the backlight color of such backlight components. The manufacture of such components faces a number of challenges. One challenge is the embedding of the luminescent crystal into the component. Due to the different chemical properties of the luminescent crystals, there may be incompatibilities between the various embedding materials comprising the luminescent crystals or even between luminescent crystals embedded within the same material. Such incompatibilities may lead to degradation of materials in display components and thus may affect the lifetime of such displays. Document US2017/0153382A1 discloses a quantum dot composite material, a method of manufacturing and applications thereof. The quantum dot composite material comprises all-inorganic perovskite quantum dots and modified protection on the surfaces of the all-inorganic perovskite quantum dots. The literature TONG-ng Xuan et al ,"Super-Hydrophobic Cesium Lead Halide Perovskite Quantum Dot-Polymer Composites with High Stability and Luminescent Efficiency for Wide Color Gamut White Light-Emitting Diodes",Chemistry of Materials,, volume 31, 3, month 12, 2019, pages 1042-1047. This document discloses a composite strategy to improve the stability of water-sensitive CsPbBr 3 quantum dots by embedding QDs into a superhydrophobic porous organic polymer backbone. The document Sijbom h.f. et al ,"Luminescent Behavior of the K2SiF6:Mn4+Red Phosphor at High Fluxes and at the Microscopic Level",ECS Journal of Solid State Science and Technology,5(1),R3040-R3048(2016). discloses the manufacture of red non-perovskite phosphor particles. Disclosure of Invention The problem underlying the present invention is to provide a material composition which overcomes the disadvantages of the prior art. The present invention will be described in detail below. Unless otherwise indicated, the following definitions shall apply to the present specification: The use of the terms "a" and "an" and "the" and similar referents in the context of describing the invention are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. The term "comprising" when used in conjunction with the following description includes "comprising", "consisting essentially of. The composition a. Composition" composition. Percentages are given in weight percent unless otherwise indicated herein or clearly contradicted by context. "independently" means that one substituent/ion may be selected from one of the substituents/ions, or may be a combination of more than one of the foregoing. The term "phosphor" is known in the art and relates to materials, in particular fluorescent materials, which exhibit luminescence phenomena. Thus, the red phosphor is a material exhibiting luminescence in a range of 610 to 650nm, for example, around 630 nm. Thus, the green phosphor is a material exhibiting luminescence in a range of 500 to 550nm, for example, around 530 nm. Typically, the phosphor is an inorganic particle. The term "phosphor particles" means particles of the above-described phosphors. The particles may be monocrystalline or polycrystalline. In the context of the present invention, the term particle refers to primary particles, not secondary particles (e.g. aggregates or agglomerates of primary particles). The term "luminescent crystal" (LC) is known in the art and relates to crystals of 3 to 100nm made of semiconductor material. The term encompasses quantum dots typically from 2 to 15nm and nanocrystals typically greater than 15nm and up to 100nm (preferably up to 50 nm). Preferably, the luminescent crystal is approximately equiaxed (e.g., sphere or cube). The particles are considered to be approximately equiaxed with an aspect ratio (longest: shortest direction) of 1 to 2 for all 3 orthogonal dimensions. Thus, the component of the LC preferably contains 50 to 100% (n/n), preferably 66 to 100% (n/n), more preferably 75 to 100% (n/n) equiaxed nanocrystals. LC, as that term refers to, means luminescence. In the context of the present invention, the term luminescent crystal includes both monocrystalline and polycrystalline particles. In the latter case, a particle may comprise several domains (grains) connected by crystalline or amorphous boundaries. Luminescent crystals are semiconductor materials that exhibit a direct band gap (typically