Quantum dot light enhancement substrate and lighting device including same

• US 10,096,744 B2
• Filed: 06/12/2017
• Issued: 10/09/2018
• Est. Priority Date: 07/23/2007
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Coe-Sullivan, Seth, Kazlas, Peter
• Primary Examiner(s): Soward, Ida M
• Application Number:
  US15/619,731
• Publication Number:
  US 20170271554A1
• Time in Patent Office: 484 Days
• CPC Class Codes: H01L 31/035218 the quantum structure being quantum dots
• CPC Class Codes: H01L 33/04 with a quantum effect structure or superlattice, e.g. tunnel junction
• CPC Class Codes: H01L 33/06 within the light emitting region, e.g. quantum confinement structure or tunnel barrier
• CPC Class Codes: H01L 33/42 Transparent materials
• CPC Class Codes: H01L 33/50 Wavelength conversion elements
• 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 33/58 Optical field-shaping elements
• CPC Class Codes: H01L 33/60 Reflective elements
• CPC Class Codes: H05B 33/145 Arrangements of the electroluminescent material
• CPC Class Codes: H10K 2102/331 Nanoparticles used in non-emissive layers, e.g. in packaging layer
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 50/17 Carrier injection layers
• CPC Class Codes: H10K 50/854 comprising scattering means
• 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
• CPC Class Codes: Y10S 977/774 Exhibiting three-dimensional carrier confinement, e.g. quantum dots

Abstract

A component including a substrate, at least one layer including a color conversion material including quantum dots disposed over the substrate, and a layer including a conductive material (e.g., indium-tin-oxide) disposed over the at least one layer. (Embodiments of such component are also referred to herein as a QD light-enhancement substrate (QD-LES).) In certain preferred embodiments, the substrate is transparent to light, for example, visible light, ultraviolet light, and/or infrared radiation. In certain embodiments, the substrate is flexible. In certain embodiments, the substrate includes an outcoupling element (e.g., a microlens array). A film including a color conversion material including quantum dots and a conductive material is also provided. In certain embodiments, a component includes a film described herein. Lighting devices are also provided. In certain embodiments, a lighting device includes a film described herein. In certain embodiments, a lighting device includes a component described herein.

Claims

1. A lighting device including:

a substrate comprising a material that is transparent to light within a predetermined range of wavelengths, the substrate including one or more optical member on a surface of the substrate;

a color conversion material comprising quantum dots and disposed over a predetermined region of a surface of the substrate opposite the optical member;

a first electrode disposed over at least a portion of the color conversion material, the first electrode being transparent to light within a second predetermined range of wavelengths;

an emissive layer disposed over at least a portion of the first electrode, wherein the emissive layer comprises a material capable of emitting blue light; and

a second electrode disposed over the emissive layer.

2. A lighting device in accordance with claim 1, wherein the optical member comprises a microlens array.

3. A lighting device in accordance with claim 1, wherein the optical member comprises a micro-relief structure.

4. A lighting device in accordance with claim 1, wherein the optical member comprises a substantially hemispherical surface.

5. A lighting device in accordance with claim 1, wherein the optical member comprises a curved surface.

6. A lighting device in accordance with claim 1, wherein the color conversion material including quantum dots is included in a layer comprising a predetermined arrangement of sub-layers disposed over a predetermined region of a surface of the substrate.

7. A lighting device in accordance with claim 1, wherein the color conversion material including quantum dots is included in a layered arrangement including two or more layers disposed over a predetermined region of a surface of the substrate.

8. A lighting device in accordance with claim 1, wherein the device further comprises one or more charge transport layers between the first and second electrodes.

9. A lighting device in accordance with claim 1, wherein the device further comprises one or more charge injection layers between the first and second electrodes.

10. A lighting device in accordance with claim 1, wherein the device comprises an OLED.

11. A lighting device in accordance with claim 1, wherein the emissive layer comprises quantum dots.

12. A lighting device in accordance with claim 1, wherein the device comprises a thin film light emitting device.

13. A lighting device in accordance with claim 1, wherein the device comprises a thin film electroluminescent device.

14. A light emitting device in accordance with claim 6, wherein a first portion of the sub-layers comprises optically transparent scatterers or non-scattering material, a second portion of the sub-layers comprises quantum dots capable of emitting red light, and a third portion of the sub-layers comprises quantum dots capable of emitting green light.

15. A light emitting device in accordance with claim 6, wherein a first portion of the sub-layers comprises optically transparent scatterers or non-scattering material, and a second portion of the sub-layers comprises quantum dots capable of emitting yellow light.

16. A light emitting device in accordance with claim 7, wherein the layered arrangement comprises a first film including quantum dots capable of emitting red light, and a second film including quantum dots capable of emitting green light, and a third film including scatterers or non-scattering material to outcouple light.

17. A light emitting device in accordance with claim 7, wherein the layered arrangement comprises a first film including quantum dots capable of emitting yellow light, a second film including scatterers or non-scattering material to outcouple light.

18. A lighting device in accordance with claim 16, wherein the first film, the second film, and the third film are formed in order with the first film being nearest the first electrode.