Quantum dot light enhancement substrate and lighting device including same
A component including a substrate, at least one layer including a color conversion material including quantum dots disposed over the substrate, and a layer including 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 including 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 lighting device including:
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, wherein the substrate further includes one or more outcoupling features on a surface of the substrate opposite the color conversion material, 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, the conductive material forming a first electrode of the device;
an emissive layer disposed over at least a portion of the conductive material, wherein the emissive layer comprises a material capable of emitting blue light; and
a second electrode disposed over the emissive layer.
2. A lighting device in accordance with claim 1 wherein the color conversion material including quantum dots is included in a layer comprising a predetermined arrangement of features disposed over a predetermined region of a surface of the substrate.
3. A lighting device in accordance with claim 1 wherein the color conversion material including quantum dots is included in a layered arrangement including two or more layers disposed over a predetermined region of a surface of the substrate.
4. A lighting device in accordance with claim 1 wherein the device further includes one or more charge transport layers between the electrodes.
5. A lighting device in accordance with claim 1 wherein the device further includes one or more charge injection layers between the electrodes.
6. A lighting device in accordance with claim 1 wherein the device comprises an OLED.
7. A lighting device in accordance with claim 1 wherein the emissive layer comprises quantum dots.
8. A lighting device in accordance with claim 1 wherein the device comprises a thin film light emitting device.
9. A lighting device in accordance with claim 1 wherein the device comprises a thin film electroluminescent device.
10. A lighting device in accordance with claim 3 wherein the films are formed in order with the first layer being nearest the conductive material.
11. A light emitting device in accordance with claim 2 wherein a first portion of the features includes optically transparent scatterers or non-scattering material, a second portion of the features includes quantum dots capable of emitting red light, and a third portion of the features includes quantum dots capable of emitting green light.
12. A light emitting device in accordance with claim 2 wherein a first portion of the features includes optically transparent scatterers or non-scattering material, and a second portion of the features includes quantum dots capable of emitting yellow light.
13. A light emitting device in accordance with claim 3 wherein the layered arrangement includes a first film including quantum dots capable of emitting red light, and a second film including quantum dots capable of emitting green light, and a third film including scatterers or non-scattering material to outcouple light.
14. A light emitting device in accordance with claim 3 wherein the layered arrangement includes a first film including quantum dots capable of emitting yellow light, a second film including scatterers or non-scattering material to outcouple light.