Light-emitting device and method for producing a light-emitting device

• US 10,388,836 B2
• Filed: 03/18/2015
• Issued: 08/20/2019
• Est. Priority Date: 04/10/2014
• Status: Active Grant

• Current Assignee: OSRAM OLED GMBH (Ams-Osram AG)
• Original Assignee: Osram Opto Semiconductors GmbH (Ams-Osram AG)
• Inventors: Stoll, Ion, von Malm, Norwin
• Primary Examiner(s): Nguyen, Vu A
• Application Number:
  US15/302,029
• Publication Number:
  US 20170117444A1
• Time in Patent Office: 1,616 Days
• CPC Class Codes: C09K 11/02 Use of particular materials as binders, particle coatings or suspension media therefor
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: H01L 2933/0033 relating to semiconductor body packages
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 2933/0091 Scattering means in or on the semiconductor body or semiconductor body package H01L33/22 takes precedence
• CPC Class Codes: H01L 33/501 characterised by the materials, e.g. binder
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H10K 2102/00 Constructional details relating to the organic devices covered by this subclass
• CPC Class Codes: H10K 2102/331 Nanoparticles used in non-emissive layers, e.g. in packaging layer
• CPC Class Codes: H10K 50/854 comprising scattering means
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass

Abstract

A light-emitting device includes a light-emitting semiconductor component that emits first light in a first wavelength range during operation A wavelength conversion element converts the first light at least partly into second light in a second wavelength range is arranged in the beam path of the first light. The second wavelength range differs from the first wavelength range. The wavelength conversion element includes nanoparticles containing organic luminescent molecules in a basic material formed from an SiO2-based material. A method for producing a light-emitting device is furthermore specified.

Claims

1. A light-emitting device, comprising:

a light-emitting semiconductor component that radiates first light in a first wavelength range during operation; and

a wavelength conversion element arranged in a beam path of the first light, wherein the wavelength conversion element is configured to convert the first light at least partially into second light in a second wavelength range different from the first wavelength range, the wavelength conversion element comprising nanoparticles containing organic luminescent molecules in an SiO₂-based basic material, wherein at least some nanoparticles contain a plurality of different organic luminescent molecules.

2. The device according to claim 1, wherein the nanoparticles comprise a coating on the basic material.

3. The device according to claim 2, wherein the coating has physical properties that prevent a particle aggregation, increase pourability of the particles, change a refractive index of the nanoparticles, or serve as a wavelength filter.

4. The device according to claim 1, wherein the wavelength conversion element comprises a matrix material, the nanoparticles being arranged in the matrix material.

5. The device according to claim 4, wherein the wavelength conversion element comprises, in the matrix material, fillers having physical properties that prevent a particle aggregation, increase pourability of the particles, change a refractive index of the nanoparticles, or serve as a wavelength filter.

6. The device according to claim 1, wherein the wavelength conversion element further comprises scattering particles.

7. The device according to claim 1, wherein multiple different particle groups are present in the wavelength conversion element, each particle group being formed by nanoparticles that contain the same organic luminescent molecules.

8. The device according to claim 7, wherein different particle groups are arranged spatially separated in the wavelength conversion element.

9. The device according to claim 1, wherein the organic luminescent molecules comprise one or more materials selected from the group consisting of:

acridine dyes, acridinone dyes, anthraquino dyes, anthracene dyes, cyanine dyes, dansyl dyes, squaryllium dyes, spiropyrans, boron-dipyrromethenes, perylenes, pyrenes, naphthalenes, flavins, pyrroles, porphyrins and metal complexes thereof, diarylmethane dyes, triarylmethane dyes, nitro and nitroso dyes, phthalocyanine dyes and metal complexes of phthalocyanines, quinones, azo dyes, indophenol dyes, oxazines, oxazones, thiazines and thiazoles, fluorenes, flurones, pyronines, rhodamines, coumarins.

10. The device according to claim 1, wherein

the organic luminescent molecules comprise transition metal complexes with organic ligands;

the transition metals comprise metals selected from the group consisting of Rh, Os, Ru, Ir, Pd, and Pt; and

the organic ligands comprise one or more materials derived from basic matrices selected from the group consisting of;

porphyrins, porphines, 2,2-bipyridines, 2-phenylpyridines, 3-(thiazole-2-yl), 3-(benzothiazole-2-yl), 3-(imidazole-2-yl), 3-(benzimidazole-2-yl), pyridyl azolate.

11. The device according to claim 1, wherein the nanoparticles comprise anchor molecule chains so that the nanoparticles bind to preselected chemical surfaces in a chemical and selective manner.

12. The device according to claim 1, wherein the wavelength conversion element comprises further inorganic wavelength conversion substances in addition to the nanoparticles.

13. The device according to claim 1, wherein the light-emitting semiconductor component comprises an inorganic light-emitting diode.

14. The device according to claim 1, wherein the light-emitting semiconductor component comprises an organic light-emitting diode.

15. A method for producing a light-emitting device, the method comprising:

providing a light-emitting semiconductor component that radiates first light in a first wavelength range during operation; and

applying a wavelength conversion element in adjacent a beam path of the first light;

wherein the wavelength conversion element is configured to convert the first light at least partially into second light in a second wavelength range different from the first wavelength range;

wherein the wavelength conversion element comprises nanoparticles containing organic luminescent molecules in an SiO₂-based basic material;

wherein at least some nanoparticles contain a plurality of different organic luminescent molecules; and

wherein the nanoparticles are applied by at least one or a combination of the following application methods;

dispensing, spraying, printing, electrophoresis, electro-spraying, and applying a pre-manufactured wavelength conversion element with the nanoparticles.

16. The method according to claim 15, wherein applying the wavelength conversion element comprises applying the nanoparticles in a solvent, the method further comprising removing the solvent after applying the nanoparticles.

17. The method according to claim 15, wherein applying the wavelength conversion element comprises applying the nanoparticles together with a matrix material.

18. The method according to claim 15, further comprising applying a matrix material to the nanoparticles after applying the wavelength conversion element.

19. The method according to claim 15, wherein the wavelength conversion element having the nanoparticles is pre-manufactured by a printing process or a molding process.

20. A light-emitting device, comprising:

a light-emitting semiconductor component that radiates first light in a first wavelength range during operation; and

a wavelength conversion element arranged in a beam path of the first light, wherein the wavelength conversion element is configured to convert the first light at least partially into second light in a second wavelength range different from the first wavelength range, the wavelength conversion element comprising nanoparticles containing organic luminescent molecules in an SiO₂-based basic material;

wherein the organic luminescent molecules comprise transition metal complexes with organic ligands;

wherein the transition metals comprise metals selected from the group consisting of Rh, Os, Ru, Ir, Pd, and Pt; and

wherein the organic ligands comprise one or more materials derived from basic matrices selected from the group consisting of porphyrins, porphines, 2,2-bipyridines, 2-phenylpyridines, 3-(thiazole-2-yl), 3-(benzothiazole-2-yl), 3-(imidazole-2-yl), 3-(benzimidazole-2-yl), pyridyl azolate.