Lighting device including quantum dots
A lighting device including an emissive material comprising quantum dots and a liquid medium disposed within a sealed container with at least a portion of a light guiding member disposed within the sealed container. Products including a lighting device in accordance with the invention are also disclosed.
1. A lighting device comprising: a sealed container at least a portion of which is light transmissive, the sealed container including a side wall and an end wall, which collectively define a hollow interior, at least one emissive material included within the hollow interior of the sealed container, the at least one emissive material comprising quantum dots dispersed in a liquid medium, and a light guiding member which extends from an internal surface of the side wall or the end wall of the sealed container into the hollow interior of the sealed container, the light guiding member being in contact with the liquid medium within the hollow interior of the sealed container, wherein the lighting device is adapted for optically coupling the light guiding member to a light source,
wherein the light guiding member extends from the internal surface of one end surface of the sealed container to a second internal surface at the opposite end of the sealed container and also extends from a first internal side surface of the sealed container to a second internal side surface of the sealed container thereby forming two chambers separated by the light guiding member in the sealed container.
2. A lighting device in accordance with claim 1 wherein the lighting device is adapted such that light from the light source is externally optically coupled to the light guiding member.
3. A lighting device in accordance with claim 1 wherein the light guiding member is substantially perpendicular to the internal surface of the sealed container from which it extends.
4. A lighting device in accordance with claim 3 wherein the light guiding member extends along the center longitudinal axis of the sealed container.
5. A lighting device in accordance with claim 3 wherein the light guiding member extends along the center lateral axis of the sealed container.
6. A lighting device in accordance with claim 3 wherein the light source is optically coupled to the light guiding member in a direction orthogonal to the longitudinal direction of the light guiding member.
7. A lighting device in accordance with claim 3 wherein the light source is optically coupled into an end of the light guiding member.
8. A lighting device in accordance with claim 3 wherein the light guiding member extends along a longitudinal dimension of the sealed container parallel to the side wall of the sealed container.
9. A lighting device in accordance with claim 1 wherein the internal surface from which the light guiding member extends is the internal surface of an end surface of the sealed container.
10. A lighting device in accordance with claim 1 wherein the internal surface from which the light guiding member extends is the internal surface of an end surface of the sealed container and the light guiding member extends to an internal surface of the opposite end of the sealed container.
11. A lighting device in accordance with claim 1 wherein the internal surface from which the light guiding member extends is the internal surface of an end surface of the sealed container and wherein a second portion of the light guiding member extends through the end surface to the exterior of the sealed container.
12. A lighting device in accordance with claim 1 further including a light source optically coupled to the light guiding member.
13. A lighting device in accordance with claim 12 wherein the light source comprises one or more inorganic semiconductor light emitting devices.
14. A lighting device in accordance with claim 12 further including a reflector positioned to reflect emitted light from the light source to the light guiding member.
15. A lighting device in accordance with claim 1 wherein each of the chambers includes at least one emissive material comprising quantum dots disposed in a medium.
16. A lighting device in accordance with claim 1 wherein two symmetrical chambers are formed in the lighting device, the two chambers being separated by the light guiding member extending between ends of the sealed container.
17. A lighting device in accordance with claim 16 wherein the light source comprises a strip including plurality of light emitting devices, the strip being optically coupled to the light guiding member along one of the side surfaces of the sealed container to which the light guiding member extends.
18. A lighting device in accordance with claim 1 wherein one or more of the emissive materials is capable of converting a portion of light emitted by the light source to light having a maximum peak emission different from that of the light emitted by the light source.
19. A lighting device in accordance with claim 1 wherein the light guiding member has a refractive index greater than the refractive index of the medium.
20. A lighting device in accordance with claim 1 wherein the sealed container is hermetically sealed.
21. A lighting device in accordance with claim 1 wherein the sealed container is light transmissive.
22. A backlight unit including a lighting device in accordance with claim 1 .
23. A liquid crystal display including a lighting device in accordance with claim 1 .
24. A lighting system comprising a lighting device in accordance with claim 1 optically coupled to one or more light sources, wherein the light system further includes a reflector having a reflecting surface, the reflector being positioned and configured to reflect uncoupled light emission from the one or more light sources into the lighting device and to reflect light emission from the lighting device out of the lighting system.
25. A lighting device in accordance with claim 1 wherein the light guiding member includes a central core which extends from the internal surface of one end surface of the sealed container to a second internal surface at the opposite end of the sealed container, the central core including a preselected number of vanes that radiate from the central core along the length of the light guiding member to an internal side wall of the container, such that the light guiding member divides the interior of the sealed contained into a plurality of chambers that run the length of the sealed container, wherein each chamber includes an emissive material comprising quantum dots dispersed in a medium comprising a liquid, the emissive material having emissive characteristics that are the same as, or different from, any one or more of the emissive material included in any other of the plurality of chambers.