LUMINESCENT COMPONENT

• US 20170369776A1
• Filed: 05/25/2016
• Published: 12/28/2017
• Est. Priority Date: 12/23/2015
• Status: Active Grant

• Current Assignee: Avantama AG
• Original Assignee: Avantama AG
• Inventors: LUCHINGER, Norman Albert, WEBER, Ines, LOHER, Stefan, OSZAJCA, Marek, HARTMEIER, Benjamin
• Granted Patent: US 10,326,058 B2
• Time in Patent Office: Days
• CPC Class Codes: C09K 11/02 Use of particular materials as binders, particle coatings or suspension media therefor
• CPC Class Codes: C09K 11/025 non-luminescent particle coatings or suspension media
• CPC Class Codes: C09K 11/665 with alkali or alkaline earth metals
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02F 1/1336 Illuminating devices
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 33/501 characterised by the materials, e.g. binder
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
• CPC Class Codes: H01L 33/52 Encapsulations

Abstract

A luminescent component includes a first element comprising a first solid polymer composition, wherein the first solid polymer composition includes first luminescent crystals, wherein the first luminescent crystals are of the perovskite structure, and are selected from compounds of formula (I): M¹_aM²_bX_c, wherein M¹ represents Cs, optionally doped with up to 30 mol % of one or more other metals having coordination number 12, M² represents Pb, optionally doped with up to 30 mol % of one or more other metals having coordination number 6, X independently represents anions selected from the group consisting of Cl, Br, I, cyanide, and thiocyanate. The first luminescent crystals are of size between 3 nm and 3000 nm, and emit light of a first wavelength in response to excitation by light with a wavelength shorter than the first wavelength. An encapsulation including a polymer or an inorganic matrix encloses the first element.

Claims

1. A luminescent component, comprising

a first element comprising a first solid polymer composition, wherein the first solid polymer composition comprises first luminescent crystals and a first polymer, wherein the first luminescent crystals

are of the perovskite structure,

are selected from compounds of formula (I):

M¹_aM²_bX_c (I), wherein

M¹ represents Cs, optionally doped with up to 30 mol % of one or more other metals having coordination number 12,

M² represents Pb, optionally doped with up to 30 mol % of one or more other metals having coordination number 6,

X independently represents anions selected from the group consisting of Cl, Br, I, cyanide, and thiocyanate,

a represents 1,

b represents 1,

c represents 3;

are of size between 3 nm and 3000 nm,

emit light of a first wavelength in response to excitation by light with a wavelength shorter than the first wavelength,

wherein the first polymer is a cyclic olefin copolymer,

an encapsulation enclosing the first element,

wherein the encapsulation comprises a polymer or an inorganic matrix.

2. The luminescent component according to claim 1,

wherein the first solid polymer composition comprises a first polymer, and

wherein the first polymer is not dissolvable in the encapsulation polymer, and vice versa.

3. The luminescent component according to claim 1,

comprising a second element comprising a second solid polymer composition, wherein the second solid polymer composition comprises second luminescent crystals, wherein the second luminescent crystals

are of the perovskite structure

are selected from compounds of formula (II):

M¹_aM²_bX_c (II), wherein

M¹ represents Cs, optionally doped with up to 30 mol % of one or more other metals having coordination number 12,

M² represents Pb, optionally doped with up to 30 mol % of one or more other metals having coordination number 6,

X independently represents anions selected from the group consisting of Cl, Br, and I, cyanide, and thiocyanate,

a represents 1,

b represents 1,

c represents 3;

are of size between 3 nm and 3000 nm,

are of a different chemical composition and/or a different size than the first luminescent crystals,

emit light of a second wavelength different to the first wavelength in response to excitation by light with a wavelength shorter than each of the first and second wavelength,

wherein the encapsulation encloses the second element.

4. The luminescent component according to claim 3,

wherein the second solid polymer composition comprises a second polymer, and

wherein the second polymer is not dissolvable in the encapsulation polymer, and vice versa.

5. The luminescent component according to claim 3,

wherein the first element and the second element are arranged spaced within the encapsulation.

6. The luminescent component according to claim 3, comprising

N further elements (nf) with N >

=1,

each further element (nf) comprising a further solid polymer composition and further luminescent crystals (n1f), wherein the further luminescent crystals (n1f)

are of the perovskite structure

are selected from compounds of formula (III);

M¹_aM²_bX_c (III), wherein

M¹ represents Cs, optionally doped with up to 30 mol % of one or more other metals having coordination number 12,

M² represents Pb, optionally doped with up to 30 mol % of one or more other metals having coordination number 6,

X independently represents anions selected from the group consisting of Cl, Br, and I, cyanide, and thiocyanate,

a represents 1,

b represents 1,

c represents 3;

are of size between 3 nm and 3000 nm,

are of a different chemical composition and/or a different size than the first, second and any of the N-1 other further luminescent crystals,

emit light of a further wavelength in response to excitation by light with a wavelength shorter than the further wavelength, wherein the further wavelength is different from the first wavelength, is different from the second wavelength, and is different of any of the N-1 other further wavelengths,

wherein each further polymer composition optionally comprises a further polymer (n2f), and wherein the further polymer (n2f) is not dissolvable in the encapsulation polymer, and vice versa.

7. The luminescent component according to claim 6,

wherein the encapsulation polymer is a polymer selected from the list of acrylate polymers, carbonate polymers, sulfone polymers, epoxy polymers, vinyl polymers, urethane polymers, ester polymers, styrene polymers, silicone polymers, olefin polymers and cyclic olefin copolymers, and

wherein the second polymer if present, and any further polymer (n2f) if present is independently selected from the group of polyacrylates, including copolymers, polystyrenes, silicones, and cyclic olefin copolymers.

8. The luminescent component according to claim 6,

wherein the first luminescent crystals, the second luminescent crystals if present, and any luminescent crystals (n1f) if present independently are of size between 5 nm and 100 nm, and/or

wherein a mean diameter of the first elements, second elements if present, and any further elements (nf) if present independently is between 1 μ

m and 500 μ

m.

9. The luminescent component according to claim 3,

wherein the first luminescent crystals are selected from the group consisting of:

CsPbBr_xI_3-x, whereby 0≦

x<

2

CsPbCl_yBr_3-y-zI_z, where 0<

y<

1, 2≦

z≦

3-y, and

wherein the second luminescent crystals are selected from the group consisting of;

—

CsPbBr_xI_3-x, where 2≦

x ≦

3

—

CsPbCl_yBr_zI_3-y-z, where 0<

y<

1, 1<

z≦

3-y.

10. The luminescent component according to claim 6,

wherein N is between 3 and 28.

11. The luminescent component according to claim 6,

wherein the first element comprises first luminescent crystals only and is free from any other luminescent crystals,

wherein the second element, if present, comprises second luminescent crystals only and is free from any other luminescent crystals

wherein the further element, if present, comprises further luminescent crystals (n1f) only and is free from any other luminescent crystals.

12. A light emitting device, comprising

a luminescent component according to claim 1,

a light source for emitting blue light,

wherein the light source is arranged for exciting the luminescent component and/or

wherein the light emitting device is one of an LCD display, an OLED display, a Light Emitting Diode (LED) or an Organic Light Emitting Diode (OLED).

13. The light emitting device according to claim 12,

wherein the light source is an LED chip, and

wherein the luminescent component at least partly encloses the LED chip.

14. The light emitting device according to claim 12,

wherein the light source is an LED chip, and

wherein the luminescent component is arranged distant from the LED chip.

15. Use of a luminescent component of claim 1, for emitting white light in response to the luminescent component being radiated by blue light, in particular as a backlight in a liquid crystal display.

16. A method for manufacturing a luminescent component according to claim 1, comprising

providing a first polymer solution comprising the first luminescent crystals,

one of

a) extracting multiple first elements from the first polymer solution by one of spray-drying, or precipitation, or

b) hardening the first polymer solution into the first solid polymer composition, and crushing the first solid polymer composition resulting in multiple first elements,

mixing the first elements into a solution including the encapsulation polymer, and

providing the luminescent component by hardening and/or drying the encapsulation polymer.

17. The luminescent component according to claim 6,

wherein the first luminescent crystals, the second luminescent crystals if present, and any luminescent crystals (n1f) if present independently are of size between 5 nm and 100 nm, and/or

wherein a mean diameter of the first elements, second elements if present, and any further elements (nf) if present independently is between 5 μ

m and 100 μ

m.

18. The luminescent component according to claim 5, wherein the first polymer and the second polymer are identical.

19. The luminescent component according to claim 7, wherein the encapsulation polymer has a water vapor transmission rate of less than 0.2 g mm m⁻

2 day<sup>−

1</sup>.

20. The luminescent component according to claim 14, wherein the LED chip is at least partly covered by a phosphor-free enclosure.