Quantum dot light enhancement substrate and lighting device including same
View Patent ↗A component including a substrate, at least one layer including a color conversion material comprising quantum dots disposed over the substrate, and a layer comprising 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 comprising 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.
1. A component comprising a substrate comprising a material that is transparent to light within a predetermined range of wavelengths, a color conversion material comprising quantum dots disposed over a predetermined region of a surface of the substrate, and a conductive material disposed over at least a portion of the color conversion material, the conductive material being transparent to light within a second predetermined range of wavelengths, wherein the component further includes one or more outcoupling features disposed on a surface of the substrate opposite the color conversion material.
2. A component in accordance with claim 1 wherein the quantum dots comprise semiconductor nanocrystals.
3. A component in accordance with claim 1 wherein the substrate comprises a waveguide.
4. A component in accordance with claim 1 wherein the substrate is flexible.
5. A component in accordance with claim 1 wherein the substrate is rigid.
6. A component in accordance with claim 1 wherein the component further includes a thin film interference filter between the substrate and color conversion material.
7. A component in accordance with claim 1 wherein an outcoupling features comprises a microlens.
8. A component in accordance with claim 1 wherein an outcoupling feature comprises a micro-relief structure.
9. A component in accordance with claim 1 wherein the component further includes an array of outcoupling features on a surface of the substrate opposite the color conversion material.
10. A component in accordance with claim 1 wherein at least a portion of the outcoupling features are configured to have predetermined outcoupling angles.
11. A component in accordance with claim 1 wherein at least a portion of the outcoupling features include a substantially hemispherical surface.
12. A component in accordance with claim 1 wherein at least a portion of the outcoupling features include a curved surface.
13. A component in accordance with claim 1 wherein the color conversion material further comprises a host material in which the quantum dots are dispersed.
14. A component in accordance with claim 1 wherein the color conversion material has an index of refraction greater than or equal to the index of refraction of the conductive material.
15. A component in accordance with claim 13 wherein the host material has an index of refraction greater than or equal to the index of refraction of the conductive material.
16. A component in accordance with claim 1 wherein the color conversion material further includes scatterers.
17. A component in accordance with claim 1 wherein a reflective material is included on the edges of the substrate.
18. A component in accordance with claim 1 wherein a reflective material is included around at least a portion of the edges of the substrate.
19. A lighting device including a component in accordance with claim 1 , wherein the conductive material acts as an electrode of the device.
20. A component in accordance with claim 13 wherein the color conversion material includes from about 0.001 to about 15 weight percent quantum dots based on the weight of host material.
21. A component in accordance with claim 1 wherein the refractive index of the color conversion material is greater than the refractive index of the substrate over which the color conversion material is disposed and is greater than the refractive index of the layer of conductive material.