Plasmonic white light source based on FRET coupled emitters

• US 10,088,114 B2
• Filed: 05/22/2017
• Issued: 10/02/2018
• Est. Priority Date: 06/02/2016
• Status: Expired due to Fees

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Philips Lighting Holding BV (Signify N.V.)
• Inventors: Lunz, Manuela, Verschuuren, Marcus Antonius, Lozano, Gabriel, Guo, Ke, De Boer, Dirk Kornelis Gerhardus
• Primary Examiner(s): Williams, Joseph L
• Assistant Examiner(s): DIAZ, JOSE
• Application Number:
  US15/601,257
• Publication Number:
  US 20170350563A1
• Time in Patent Office: 498 Days
• CPC Class Codes: C09K 11/0883 Arsenides; Nitrides; Phosphides
• 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 9/30 Elements containing photoluminescent material distinct from or spaced from the light source shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40
• CPC Class Codes: G02B 5/008 Surface plasmon devices diffractive gratings with a pitch less than or comparable to the wavelength G02B5/1809; surface plasmons in integrated optics G02B6/1226; optical analysis of materials by means of surface plasmons G01N21/553
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: Y02B 20/00 Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Abstract

The invention provides a lighting device comprising a light source and a light converter, wherein the light source is configured to provide light source light, wherein the light converter comprises a donor luminescent material able to convert at least part of the first light source light into donor light, and a acceptor luminescent material, wherein the donor luminescent material and acceptor luminescent material are configured as donor-acceptor luminescent materials which, upon excitation of the donor luminescent material by the light source light provide acceptor light having an acceptor light spectral distribution different from a donor light spectral distribution of the donor light, wherein the light converter further comprises a periodic plasmonic antenna array configured to enhance generation of said donor light, and wherein the lighting device is configured to provide lighting device light comprising said donor light and said acceptor light.

Claims

1. A lighting device comprising a light source and a light converter, wherein the light source is configured to provide light source light, wherein the light converter comprises a donor luminescent material able to convert at least part of the first light source light into donor light, and a acceptor luminescent material, wherein the donor luminescent material and acceptor luminescent material are configured as donor-acceptor luminescent materials which, upon excitation of the donor luminescent material by the light source light provide acceptor light having an acceptor light spectral distribution different from a donor light spectral distribution of the donor light, wherein the light converter further comprises a periodic plasmonic antenna array configured to enhance generation of said donor light, and wherein the lighting device is configured to provide lighting device light comprising said donor light and said acceptor light.

2. The lighting device according to claim 1, wherein the donor luminescent material, acceptor luminescent material, and the periodic plasmonic antenna array are configured to provide, upon generation of the light source light, said lighting device light comprising said donor light, said acceptor light, and said light source light.

3. The lighting device according to claim 1, wherein the lighting device is configured to generate white lighting device light.

4. The lighting device according to claim 1, wherein said donor luminescent material and said acceptor luminescent material comprise dye molecules.

5. The lighting device according to claim 1, wherein said donor luminescent material comprises quantum dots and wherein said acceptor luminescent material comprises dye molecules.

6. The lighting device according to claim 1, wherein the light source comprises a solid state light source, wherein said donor luminescent material is configured to provide said donor light having a wavelength selected from the range of 500-580 nm, and wherein said acceptor luminescent material is configured to provide said acceptor light having a wavelength selected from the range of 580-650 nm.

7. The lighting device according to claim 1, wherein the donor-acceptor luminescent materials have a donor-acceptor energy transfer efficiency of at least 70%, wherein the donor-acceptor luminescent materials have a donor-acceptor energy transfer rate, wherein the periodic plasmonic antenna array has a plasmonic rate which is at least 10% of the donor-acceptor energy transfer rate.

8. The lighting device according to claim 1, wherein the donor luminescent material, acceptor luminescent material, and the periodic plasmonic antenna array are comprised by a single layer.

9. The lighting device according to claim 1, wherein the donor luminescent material, acceptor luminescent material, and the periodic plasmonic antenna array are comprised by different layers not comprising the one or more of the other of the donor luminescent material, acceptor luminescent material, and the periodic plasmonic antenna array.

10. The lighting device according to claim 1, wherein the periodic plasmonic antenna array has a periodicity having selected from the range of 200-1000 nm.

11. The lighting device according to claim 10, and wherein the plasmonic antenna array comprises a hexagonal or square array.

12. The lighting device according to claim 1, wherein the periodic plasmonic antenna array comprises metal nanoparticles.

13. The lighting device according to claim 1, wherein the periodic plasmonic antenna array comprises truncated aluminum pyramids having a top side in the range of 50 to 150 nm, a bottom side in the range of 100 to 200 nm, and a height in the range of 100 to 200 nm.

14. The lighting device according to claim 1, wherein the light converter comprises a second periodic plasmonic antenna array configured to enhance generation of said acceptor light, wherein the second periodic plasmonic antenna array has a second periodicity different from the periodicity of the periodic plasmonic antenna array.