Quantum dot films, lighting devices, and lighting methods

Patent metadata

Field	Value
Publication number	US-9804319-B2
Application number	US-201615018512-A
Country	US
Kind code	B2
Filing date	Feb 8, 2016
Priority date	Dec 30, 2008
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

Light-emitting quantum dot films, quantum dot lighting devices, and quantum dot-based backlight units are provided. Related compositions, components, and methods are also described. Improved quantum dot encapsulation and matrix materials are provided. Quantum dot films with protective barriers are described. High-efficiency, high brightness, and high-color purity quantum dot-based lighting devices are also included, as well as methods for improving efficiency and optical characteristics in quantum dot-based lighting devices.

First claim

What is claimed is:

1. A display backlighting unit (BLU), comprising:
at least one primary light source that emits primary light;
a light guide panel (LGP) optically coupled to the at least one primary light source, whereby the primary light is transmitted uniformly through the LGP; and
a remote phosphor film, sandwiched between at least two barrier layers, comprising only two populations of light emitting quantum dots (QDs) including a first population of QDs configured to emit first secondary light and a second population of QDs configured to emit second secondary light at a different wavelength than the first secondary light;
wherein the remote phosphor film is not directly physically coupled to the LGP, wherein the primary light transmits uniformly through the LGP and into the remote phosphor film, whereby at least a portion of the primary light is absorbed by the two populations of QDs and reemitted by the QDs as the first and second secondary light, and
wherein the remote phosphor film comprises a plurality of spatial regions.

2. The display BLU of claim 1 , wherein the spatial regions of the plurality of remote phosphor film are at a same planar layer of the display BLU.

3. The display BLU of claim 2 , wherein the same planar layer has a property that is uniform in the same planar layer.

4. The display BLU of claim 3 , wherein the property is selected from the group consisting of: thickness, shape, emission color, concentration of QDs, QD size, QD material composition, QD gradients, QD arrangements and combinations thereof.

5. The display BLU of claim 2 , wherein the same planar layer has a property that is varied in the same planar layer.

6. The display BLU of claim 5 , wherein the property is selected from the group consisting of: thickness, shape, emission color, concentration of QDs, QD size, QD material composition, QD gradients, QD arrangements and combinations thereof.

7. The display BLU of claim 1 , wherein the plurality of remote phosphor film comprises a plurality of layers.

8. The display BLU of claim 1 , wherein the plurality of remote phosphor film comprises a plurality of individual films cut from one or more larger phosphor films before being disposed in the spatial regions.

9. A display backlighting unit (BLU), comprising:
at least one primary light source that emits primary light; and
a plurality of remote phosphor films each disposed in separate spatial regions of the display BLU, each remote phosphor film sandwiched between at least two barrier layers and comprising a quantum dot (QD) phosphor material comprising at least one population of QDs embedded in at least one matrix material, wherein the at least one population of QDs emit secondary light upon absorbance of the primary light;
wherein the plurality of remote phosphor films are not directly physically coupled to the at least one primary light source, wherein the primary light transmits into the plurality of remote phosphor films, whereby at least a portion of the primary light is absorbed by the at least one population of QDs in the plurality of remote phosphor films and remitted by the QDs as the secondary light having a longer wavelength than the primary light.

10. The display BLU of claim 9 , wherein the separate spatial regions of the plurality of remote phosphor film are at a same planar layer of the display BLU.

11. The display BLU of claim 10 , wherein the same planar layer has a property that is uniform in the same planar layer.

12. The display BLU of claim 11 , wherein the property is selected from the group consisting of: thickness, shape, emission color, concentration of QDs, QD size, QD material composition, OD gradients, QD arrangements and combinations thereof.

13. The display BLU of claim 10 , wherein the same planar layer has a property that is varied in the same planar layer.

14. The display BLU of claim 13 , wherein the property is selected from the group consisting of: thickness, shape, emission color, concentration of QDs, QD size, OD material composition, QD gradients, OD arrangements and combinations thereof.

15. The display BLU of claim 9 , wherein each remote phosphor film comprises a plurality of layers.

16. The display BLU of claim 9 , wherein the plurality of remote phosphor film comprises a plurality of individual films cut from one or more larger phosphor films before being disposed in the spatial regions.

17. A display backlighting unit (BLU), comprising:
at least one primary light source that emits primary light;
a light guide panel (LGP) optically coupled to the at least one primary light source, whereby the primary light is transmitted uniformly through the LGP; and
a remote phosphor film, sandwiched between at least two barrier layers, comprising at least two populations of light emitting quantum dots (QDs) including a first population of QDs configured to emit first secondary light and a second population of QDs configured to emit second secondary light at a different wavelength than the first secondary light;
wherein the remote phosphor film is not directly physically coupled to the LGP, wherein the primary light transmits uniformly through the LGP and into the remote phosphor film, whereby at least a portion of the primary light is absorbed by the at least two populations of QDs and reemitted by the QDs as the first and second secondary light, and
wherein the remote phosphor film comprises a plurality of spatial regions.

18. The display BLU of claim 17 , wherein the spatial regions of the remote phosphor film are at a same planar layer of the display BLU.

19. The display BLU of claim 18 , wherein the same planar layer has a property that is uniform in the same planar layer.

20. The display BLU of claim 19 , wherein the property is selected from the group consisting of: thickness, shape, emission color, concentration of QDs, QD size, QD material composition, QD gradients, QD arrangements and combinations thereof.

21. The display BLU of claim 18 , wherein the same planar layer has a property that is varied in the same planar layer.

22. The display BLU of claim 21 , wherein the property is selected from the group consisting of: thickness, shape, emission color, concentration of QDs, QD size, QD material composition, QD gradients, QD arrangements and combinations thereof.

23. The display BLU of claim 17 , wherein the remote phosphor film comprises a plurality of individual films cut from one or more larger phosphor films before being disposed in the spatial regions.

24. A display backlighting unit (BLU), comprising:
at least one primary light source that emits primary light;
a light guide panel (LGP) optically coupled to the at least one primary light source, whereby the primary light is transmitted uniformly through the LGP; and
a remote phosphor film, sandwiched between at least two barrier layers, comprising at least one population of light emitting quantum dots (QDs) configured to emit first secondary light;
wherein the remote phosphor film is not directly physically coupled to the LGP, wherein the primary light transmits uniformly through the LGP and into the remote phosphor film, whereby at least a portion of the primary light is absorbed by the at least one population of QDs and reemitted by the QDs as the first secondary light having a longer wavelength than the primary light, and
wherein the remote phosphor film comprises a plurality of spatial regions.

25. The display BLU of clai

Assignees

• Nanosys Inc

Inventors

• Dubrow Robert S
• Freeman William P
• Lee Ernest
• Furuta Paul

Classifications

• B32B9/04

  comprising such {particular} substance as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a glass layer B32B17/06; layered products with at least two ceramic layers composed mainly of ceramic B32B18/00)} · CPC title

• G02B6/0073

  Light emitting diode [LED] · CPC title

• B82Y20/00

  Nanooptics, e.g. quantum optics or photonic crystals · CPC title

• B32B2457/202

  LCD, i.e. liquid crystal displays · CPC title

• B32B5/16 Primary

  characterised by features of a layer formed of particles, e.g. chips, powder {or granules (layer formed of natural mineral particles B32B19/00; layer being formed of wood fibres, chips or particles B32B21/02)} · CPC title