Granted Patent B2

US 10,627,561 · App. 16/516,688 · Granted Apr 21, 2020

Inventors: Seth Coe-Sullivan (Redondo Beach, CA); John R. Linton (Concord, MA); Daniel Cohen (Concord, MA); John E. Ritter (Westford, MA)

Assignee: SAMSUNG ELECTRONICS CO., LTD.

G02B6/0026G02B6/005G02B6/0073

Abstract

Claims (24)

1. A lighting system, which comprises:

a light source providing a light having a first predetermined spectral output, and

a layer comprising an optical material optically coupled to receive at least a portion of the light from the light source and to convert at least a portion of the light to at least one predetermined wavelength to provide modified light having a second predetermined spectral output,

wherein the light source comprises a blue emitting material,

wherein the optical material comprises quantum confined semiconductor nanoparticles, and the quantum confined semiconductor nanoparticles are arranged in a predetermined pattern to emit photons of predetermined wavelength in response to absorption of the light,

wherein the layer comprising the optical material comprises a first patterned layer, and the layer comprising the optical material comprises a first type of quantum confined semiconductor nanoparticle capable of emitting red light,

wherein the optical material is spaced from the light source, and

wherein the second predetermined spectral output includes a red component having a CIE x>0.64.

2. A lighting system in accordance with claim 1 , wherein the layer comprising the optical material comprises a second patterned layer and the layer comprising the optical material comprises a second type of quantum confined semiconductor nanoparticle capable of emitting green light.

3. A lighting system in accordance with claim 1 , wherein the first predetermined spectral output comprises a spectral component in a region from about 360 nm to about 475 nm.

4. A lighting system in accordance with claim 1 , wherein the modified light having the second predetermined spectral output is emitted from the lighting system.

5. A lighting system in accordance with claim 1 , wherein the second predetermined spectral output comprises red peak emission.

6. A lighting system in accordance with claim 4 , wherein the second predetermined spectral output further comprises green peak emission.

7. A lighting system in accordance with claim 1 , wherein the quantum confined semiconductor nanoparticles are cadmium free.

8. A lighting system in accordance with claim 1 , wherein the quantum confined semiconductor nanoparticle comprises a III-V semiconductor material.

9. A lighting system in accordance with claim 1 , wherein the quantum confined semiconductor nanoparticles comprise a core comprising a Group IV element or a compound represented by a formula MX, where M is cadmium, zinc, magnesium, mercury, aluminum, gallium, indium, thallium, or a mixture thereof, and X is oxygen, sulfur, selenium, tellurium, nitrogen, phosphorus, arsenic, antimony, or a mixture thereof, and an inorganic shell disposed on at least a portion of a surface of the core.

10. A lighting system in accordance with claim 1 , wherein the layer comprising the optical material further comprises a host material and the quantum confined semiconductor nanoparticles are distributed in the host material.

11. A lighting system in accordance with claim 10 , wherein the host material comprises a polymeric material at least partially transparent to preselected wavelengths of visible light.

12. A lighting system in accordance with claim 1 wherein the layer comprising the optical material further comprises scatterers and the scatterers comprises a metal particle, a metal oxide particle, a glass bead, a polymeric bead, or a combination thereof.

13. A lighting system in accordance with claim 12 , wherein the metal oxide particle comprises TiO 2 , SiO 2 , BaTiO 2 , BaSO 4 , or ZnO.

14. A lighting system in accordance with claim 12 , wherein the layer comprising the optical material further comprises a host material and the scatteres are included in the layer in an amount from about 0.001 to about 5 weight percent of the weight of the host material.

15. A lighting system in accordance with claim 1 , wherein the lighting system comprises a filter layer over the layer comprising the optical material.

16. A lighting system in accordance with claim 1 , wherein the filter layer blocks passage of one or more predetermined wavelengths of light.

17. A display comprising a lighting system in accordance with claim 1 .

Continuity (8)