Highly stable QDS-composites for solid state lighting and the method of making them through initiator-free polymerization

• US 9,909,738 B2
• Filed: 10/31/2016
• Issued: 03/06/2018
• Est. Priority Date: 08/06/2012
• Status: Active Grant

• Current Assignee: Koninklijke Philips N.V., Samsung Electronics Co. Ltd.
• Original Assignee: Koninklijke Philips N.V., Samsung Electronics Co. Ltd.
• Inventors: Xu, Shu, Ivan, Marius Gabriel, Breen, Craig Allen, Hikmet, Rifat Ata Mustafa
• Primary Examiner(s): Green, Tracie Y
• Application Number:
  US15/339,528
• Publication Number:
  US 20170059128A1
• Time in Patent Office: 491 Days
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: B82Y 35/00 Methods or apparatus for measurement or analysis of nanostructures
• CPC Class Codes: C01G 23/047 Titanium dioxide
• CPC Class Codes: C01P 2006/60 Optical properties, e.g. expressed in CIELAB-values
• 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 11/565 with zinc cadmium
• CPC Class Codes: C09K 11/883 with zinc or cadmium
• CPC Class Codes: F21K 9/62 using mixing chambers, e.g. housings with reflective walls
• 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 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21V 9/08 for producing coloured light, e.g. monochromatic; for reducing intensity of light with provision for controlling the colour F21V9/40
• CPC Class Codes: F21V 9/32 characterised by the arrangement of the photoluminescent material
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: F21Y 2115/30 Semiconductor lasers
• CPC Class Codes: G02F 1/01791 Quantum boxes or quantum dots
• CPC Class Codes: G02F 1/133609 including means for improving the color mixing, e.g. white
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light
• CPC Class Codes: Y10S 977/774 Exhibiting three-dimensional carrier confinement, e.g. quantum dots
• CPC Class Codes: Y10S 977/779 Possessing nanosized particles, powders, flakes, or clusters other than simple atomic impurity doping
• CPC Class Codes: Y10S 977/89 : Deposition of materials, e.g. coating, cvd, or ald
• CPC Class Codes: Y10S 977/95 : Electromagnetic energy

Abstract

The invention provides a lighting device comprising (i) a light source configured to generate light source light, and (ii) a light converter configured to convert at least part of the light source light into visible converter light, wherein the light converter comprises a polymeric host material with light converter nanoparticles embedded in the polymeric host material, wherein the polymeric host material is based on radical polymerizable monomers, and wherein the polymeric host material contains equal to or less then 5 ppm radical initiator based material relative to the total weight of the polymeric host material.

Claims

1. A device comprising:

a light source for generating light source light,

a light converter for converting at least part of the light source light into visible converter light, the light converter comprising;

a polymeric host material;

light converter nanoparticles embedded in the polymeric host material;

wherein;

the polymeric host material is based on radical polymerizable monomers, and

the polymeric host material contains equal to or less than 5 ppm radical initiator based material relative to the total weight of the polymeric host material; and

first and second substrates, wherein the first and second substrates sandwich the polymeric host material and the light converter nanoparticles.

2. The device of claim 1 wherein the first and second substrates are glass plates.

3. The device of claim 1 wherein the first and second substrates are barrier films.

4. The device of claim 1 wherein the first substrate is a glass plate and the second substrate is a barrier film.

5. The device of claim 1 wherein the first substrate is a hard metal oxide coating.

6. The device of claim 1 wherein the first and second substrates are encapsulated by a perimeter encapsulation.

7. The device of claim 1 wherein the first substrate is a multi-layer film.

8. The device of claim 1 wherein the first and second substrates are oxygen non-permeable.

9. The device of claim 1 further comprising glue disposed on edges of the light converter.

10. The device of claim 1 wherein the first substrate comprises a container in which the polymeric host material and the light converter nanoparticles are disposed, and the second substrate comprises a cover glued or welded to edges of the container.

11. A device comprising:

a light source for generating light source light,

a light converter for converting at least part of the light source light into visible converter light, the light converter comprising;

a polymeric host material; and

light converter nanoparticles embedded in the polymeric host material;

wherein;

the polymeric host material is based on radical polymerizable monomers,

the polymeric host material contains equal to or less than 5 ppm radical initiator based material relative to the total weight of the polymeric host material, and

a portion of the light converter is reflective.

12. The device of claim 11 wherein the portion of the light converter that is reflective forms a wall of a light mixing chamber.

13. The device of claim 12 wherein the light mixing chamber comprises an exit window, wherein the exit window is a portion of the light converter that is transmissive.

14. The device of claim 11 wherein the light source light is blue and the visible converter light is one of yellow, green, and red.

15. The device of claim 11 wherein substantially all of the light source light is converted by the light converter, such that light exiting the device is substantially all visible converter light.

16. A device comprising:

a light source for generating light source light,

a light converter for converting at least part of the light source light into visible converter light, the light converter comprising;

a polymeric host material; and

light converter nanoparticles embedded in the polymeric host material;

wherein;

the polymeric host material is based on radical polymerizable monomers, and

the polymeric host material contains equal to or less than 5 ppm radical initiator based material relative to the total weight of the polymeric host material; and

particles not having nanoparticle character disposed in a path of one of the light source light and the visible converter light.

17. The device of claim 16 wherein the particles not having nanoparticle character are micron sized particulate inorganic luminescent material.

18. The device of claim 16 wherein the particles not having nanoparticle character are reflective Ti02 particles.

19. The device of claim 16 wherein the light converter is enclosed by an encapsulation, wherein the encapsulation is configured to reduce exposure of the light converter to 02.

20. The device of claim 16 wherein the polymeric host material is selected from the group consisting of a poly vinyl polymer, a poly acrylate polymer and a thiol-ene polymer.