INDUCTIVELY EXCITED QUANTUM DOT LIGHT EMITTING DEVICE

• US 20090001403A1
• Filed: 06/29/2007
• Published: 01/01/2009
• Est. Priority Date: 06/29/2007
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Skipor, Andrew F., Latella, Rick
• Application Number:
  US11/770,939
• Publication Number:
  US 20090001403A1
• Time in Patent Office: Days
• US Class Current: 257/99
• CPC Class Codes: H05B 33/10 Apparatus or processes specially adapted to the manufacture of electroluminescent light sources

Abstract

A method and apparatus is provided for activating a layer (208, 308, 408) of free standing quantum dots. The apparatus comprises a first coil (216, 316, 426) disposed contiguous to a light emitting device (200, 300, 400, 612) including the free standing quantum dots. An alternating current is supplied to the coil (216, 316, 426) for generating an electric field, and the plurality of free standing quantum dots are subjected to the electric field thereby causing photons to be emitted therefrom. A structure (214, 328), such as a housing (620) of a portable electronic device (610, 710) may be positioned either, when opaque, between the light emitting device (300, 400) and the coil (316, 426), or, when transparent, on a side of the light emitting device (200) opposed to the coil (216).

Claims

1. An apparatus comprising:

a light emitting device including a plurality of quantum dots; and

a first coil disposed contiguous to the light emitting device, wherein an electric field generated by the first coil causes the plurality of quantum dots to emit photons.

2. The apparatus of claim 1 further comprising a transparent structure to which the light emitting device is attached and wherein the photons pass through the transparent structure.

3. The apparatus of claim 1 further comprising a structure having the light emitting device mounted thereon and the first coil being disposed on a side of the structure opposed to the light emitting device.

4. The apparatus of claim 3 wherein the structure defines an indent having the light emitting device disposed therein.

5. The apparatus of claim 1 wherein the structure is a housing of a portable electronic device.

6. The apparatus of claim 1 further comprising:

a structure having the light emitting device and the first coil mounted on a first side thereof; and

a second coil disposed on a second side of the structure, wherein an electric field generated by the second coil interacts with the first coil, the first coil providing a current to cause the plurality of quantum dots to emit photons.

7. The apparatus of claim 6 wherein the second coil provides an AC current, the apparatus further comprising an AC/DC converter disposed on the first side and coupled between the AC/DC converter and the light emitting device.

8. An apparatus comprising:

a housing;

a light emitting device disposed contiguous to the housing, comprising;

a cathode;

a electron transparent layer formed over the cathode;

at least one layer of a plurality of quantum dots disposed over the electron transport layer;

a hole transport layer formed over the plurality of quantum dots; and

an anode formed over the hole transport layer;

a first coil disposed contiguous to the light emitting device, wherein an electric field generated by the first coil causes the plurality of quantum dots to emit photons.

9. The apparatus of claim 8 wherein the housing is transparent, the anode is adjacent a first side of the housing, the photons passing through the transparent housing;

and the first coil is disposed on the first side of the housing.

10. The apparatus of claim 8 wherein the cathode is adjacent a second side of the transparent housing and the first coil is disposed on the first side of the transparent housing.

11. The apparatus of claim 8 wherein the cathode is adjacent a second side of the housing and the first coil is disposed on the second side of the housing, the apparatus further comprising:

a second coil disposed on a first side of the housing so that an electric field generated by the second coil creates a current in the first coil;

a first electrical conductor coupled between a first end of the first coil and the cathode; and

a second electrical conductor coupled between a second end of the first coil and the anode.

12. The apparatus of claim 11 further comprising an AC to DC converter coupled between the second coil and the first and second electrical conductors.

13. A method of emitting photons from a light emitting device, comprising:

supplying an alternating current to a coil for generating an electric field; and

subjecting a plurality of free standing quantum dots to the electric field to cause the free standing quantum dots to emit photons.

14. The method of claim 13 wherein the light emitting device comprises a cathode, an electron transparent layer formed over the cathode, the plurality of free standing quantum dots disposed over the electron transport layer, a hole transport layer formed over the plurality of free standing quantum dots;

and an anode formed over the hole transport layer and disposed adjacent to a transparent structure, the method further comprising;

passing the photons through the transparent structure to which the free standing quantum dots are attached.

15. The method of claim 13 wherein the transparent structure comprising a housing of an electronic device and the passing step comprises passing the photons through the housing.

16. The method of claim 13 wherein the light emitting device comprises a cathode disposed adjacent to a structure, an electron transparent layer formed over the cathode, the plurality of free standing quantum dots disposed over the electron transport layer, a hole transport layer formed over the plurality of free standing quantum dots;

and an anode formed over the hole transport layer, wherein the subjecting step comprises;

applying the electric field through the structure.