Electrophosphorescent organic light emitting concentrator
Embodiments of the disclosed subject matter provide a device with a base having an opening, and a plurality of organic light emitting devices (OLEDs) disposed on a plurality of substrates and arranged in a light directing structure onto the base, where the opening of the base is a light exit aperture of light output by the plurality of OLEDs.
1. A device comprising:
a base having an opening; and
a plurality of organic light emitting devices (OLEDs) disposed on a plurality of substrates and arranged in a light directing structure onto the base,
wherein the opening of the base is a light exit aperture of light output by the plurality of OLEDs, and
wherein at least one of the group consisting of microlens arrays and a grating is embedded into each of the plurality of substrates, so that the light output from the light exit aperture has a directed illumination profile.
2. The device of claim 1 , wherein each OLED of the plurality of OLEDs comprises:
a reflective surface disposed to direct light output by each OLED towards the light exit aperture independent of its original emission position within the light directing structure.
3. The device of claim 2 , wherein the reflective surface of opposing sides of the light directing structure concentrates light emitted into the structure from the OLEDs and directs the light towards the light exit aperture.
4. The device of claim 1 , wherein the plurality of OLEDs comprise:
four triangular OLEDs disposed on respective substrates and arranged on the base such that the light directing structure is a pyramidal structure.
5. The device of claim 1 , wherein a total emissive area of the OLEDs is larger than that of the light exit aperture so as to increase luminance.
6. The device of claim 1 , wherein a directionality of light emitted from the OLEDs determines a radiation pattern and the concentration of the light output.
7. The device of claim 1 , wherein an emission profile of the device is adjustable according to a profile of the OLEDs.
8. The device of claim 1 , wherein the light exit aperture is adjustable, wherein a larger aperture produces a higher luminous flux at a lower exit angle than that with a smaller aperture, since light emitted by the OLEDs at a vertex of the light directing structure has fewer reflections with the larger aperture.
9. The device of claim 1 , wherein one or more of the plurality of substrates of the light directing structure are disposed with respect to one another so as to form apex angles of 15.5°-55.5°.
10. The device of claim 9 , wherein the apex angles decrease the exit angle of light output from the light exit aperture.
11. The device of claim 9 , wherein the apex angles provide a concentration factor of 3.0 to 1.4 and an extraction efficiency of 40%-70% of the light output by the plurality of OLEDs.
12. The device of claim 1 , wherein apex angles at which the substrates are disposed with respect to one another are adjustable so as to enable emission from any location from the OLEDs to be directed toward the light exit aperture.
13. The device of claim 1 , wherein the plurality of OLEDs are selected from the group consisting of: flexible OLEDs, fluorescent OLEDs, or phosphorescent OLEDs.
14. The device of claim 1 , wherein the plurality of OLEDs emit light having colors selected from the group consisting of: red light, green light, blue light, and white light.
15. The device of claim 14 , further comprising:
a controller to control a color temperature of the emitted light from the plurality of OLEDs.
16. The device of claim 1 , wherein a surface of the plurality of OLEDs is reflective to visible light.
17. The device of claim 1 , wherein the light directing structure is a polyhedral structure.
18. The device of claim 17 , wherein the polyhedral structure is selected from the group consisting of: a triangular structure, a tetragonal structure, a pentagonal structure, a hexagonal structure, a heptagonal structure, an octagonal structure, a nonagonal structure, a decagonal structure, a hendecagonal structure, and a dodecagonal structure.
19. The device of claim 1 , wherein the light directing structure is a parabolic structure.
20. The device of claim 19 , wherein the parabolic structure is selected from the group consisting of: a simple paraboloid, a circular paraboloid, an elliptic paraboloid, a hyperbolic paraboloid, and a compound paraboloid.