Lighting device with polymer containing luminescent moieties

• US 10,011,766 B2
• Filed: 06/03/2013
• Issued: 07/03/2018
• Est. Priority Date: 06/08/2012
• Status: Expired due to Fees

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Philips Lighting Holding BV (Signify N.V.)
• Inventors: Hikmet, Rifat Ata Mustafa, Van Bommel, Ties
• Primary Examiner(s): Clark, Gregory D
• Application Number:
  US14/405,410
• Publication Number:
  US 20150166882A1
• Time in Patent Office: 1,856 Days
• Field of Search: None
• CPC Class Codes: C08G 63/6856 Dicarboxylic acids and dihydroxy compounds
• 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 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 2211/1011 Condensed systems
• CPC Class Codes: C09K 2211/1044 containing two nitrogen atoms as heteroatoms
• CPC Class Codes: C09K 2211/1466 containing nitrogen as the only heteroatom
• 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: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 9/38 Combination of two or more photoluminescent elements of different materials
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H05B 33/14 characterised by the chemical or physical composition or the arrangement of the electroluminescent material , or by the simultaneous addition of the electroluminescent material in or onto the light source
• CPC Class Codes: H05B 33/145 Arrangements of the electroluminescent material
• CPC Class Codes: H05B 33/20 characterised by the chemical or physical composition or the arrangement of the material in which the electroluminescent material is embedded

Abstract

The invention provides a lighting device comprising (a) a light source, for producing light source light, and (b) a light converter, wherein the converter comprises a matrix of a first polymer, the matrix containing discrete regions comprising a second polymer with luminescent functionality, wherein the second polymer comprises an aromatic polyester comprising luminescent moieties, and wherein the first polymer is chemically different from the aromatic polyester. The invention also provides a light converter, wherein the converter comprises a matrix of a first polymer, the matrix containing discrete regions comprising a second polymer with luminescent functionality, wherein the second polymer comprises an aromatic polyester comprising luminescent moieties, and wherein the first polymer is chemically different from the aromatic polyester.

Claims

1. A lighting device comprising:

a light source for producing light source light, and

a converter, wherein the converter comprises a matrix of a first polymer, the matrix containing discrete regions comprising a second polymer with luminescent functionality, wherein the second polymer comprises an aromatic polyester comprising luminescent moieties, wherein one or more of the luminescent moieties comprise perylene groups, wherein the first polymer is chemically different from the aromatic polyester, wherein the converter is radiationally coupled to the light source, wherein one or more of the luminescent moieties are part of a backbone of the aromatic polyester and/or wherein one or more of the luminescent moieties are chemically attached to a backbone of the aromatic polyester.

2. The lighting device according to claim 1, wherein the first polymer comprises a polymer selected from the group consisting of PMMA (poly methyl methacrylate), PS (polystyrene), and PC (polycarbonate), and wherein the aromatic polyester is PET (polyethylene therephthalate) or PEN (polyethylene naphthalate) based.

3. The lighting device according to claim 1, wherein the aromatic polyester comprising luminescent moieties is selected from the group consisting of a linear polymer, a (hyper)branched polymer, a cross-linked polymer, a star polymer, a dendrimer, a random copolymer, an alternating copolymer, a graft copolymer, a block copolymer, and a terpolymer.

4. The lighting device according to claim 1, wherein the discrete regions occupy in the range of 0.5-50 vol. % of the volume of the converter.

5. The lighting device according to claim 1, wherein the content of luminescent moieties in the second polymer is 10% by weight or less.

6. The lighting device according to claim 1, wherein the light source comprises a solid state light source, wherein the first polymer comprises a polymer selected from the group consisting of PMMA (poly methyl methacrylate), PS (polystyrene), and PC (polycarbonate), and wherein the aromatic polyester is PET (poly ethylene therephtralate) based or PEN (polyethylene naphthalate) based.

13. The lighting device according to claim 1, wherein the light source comprises a blue light emitting light source.

14. The lighting device according to claim 1, wherein the light source comprises a violet light emitting light source.

15. The lighting device according to claim 1, wherein the light source comprises a solid state light source.

16. The lighting device according to claim 15, wherein the solid state light source comprises a light emitting diode (LED).

7. A converter, for converting light into luminescence, wherein the converter comprises a matrix of a first polymer, the matrix containing discrete regions comprising a second polymer with luminescent functionality, wherein the second polymer comprises an aromatic polyester comprising luminescent moieties, wherein one or more of the luminescent moieties comprise perylene groups, wherein one or more of the luminescent moieties are part of a backbone of the aromatic polyester and/or wherein one or more of the luminescent moieties are chemically attached to a backbone of the aromatic polyester, and wherein the first polymer is chemically different from the aromatic polyester.

8. The converter according to claim 7, wherein the first polymer is a polymer having an absorption of less than 5%/mm in the wavelength range of 400-700 nm.

17. The converter according to claim 7, wherein the converter has a thickness in the range of 0.1-10 mm.

9. A method for providing a converter, the method comprising providing an aromatic polyester comprising luminescent moieties wherein one or more of the luminescent moieties are part of a backbone of the aromatic polyester and/or wherein one or more of the luminescent moieties are chemically attached to a backbone of the aromatic polyester, and a first polymer, wherein the first polymer is chemically different from the aromatic polyester, blending the aromatic polyester comprising luminescent moieties in the first polymer, and optionally shaping the thus obtained product.

10. The method according to claim 9, wherein the aromatic polyester comprising luminescent moieties is a cross-linked aromatic polyester comprising luminescent moieties.

11. The method according to claim 10 wherein the method comprises blending the aromatic polyester comprising luminescent moieties in the first polymer and molding the thus obtained product into a molded converter.

12. The method according to claim 10, wherein the method comprises molding the aromatic polyester comprising luminescent moieties and the first polymer into a molded converter.