We demonstrate threefold directional light concentration from an organic light-emitting diode luminaire for use in spot lighting and other applications where high intensity illumination is required.The concentrating l...We demonstrate threefold directional light concentration from an organic light-emitting diode luminaire for use in spot lighting and other applications where high intensity illumination is required.The concentrating luminaire comprises four triangular,large-area green electrophosphorescent organic light emitting diodes(PHOLEDs)deposited on plastic substrates and assembled into a pyramidal structure with an open base that serves as the light exit aperture.The PHOLED surfaces are highly reflective to direct the emission from the devices to the aperture independent of the original emission position within the pyramid.The far-field intensity profile of the concentrator has a‘batwing’distribution that meets the requirements for general lighting for uniform illumination of planar surfaces.展开更多
Practical solar energy solutions must not only reduce the cost of the module,but also address the substantial balance of system costs.Here,we demonstrate a counter-intuitive approach based on gallium arsenide solar ce...Practical solar energy solutions must not only reduce the cost of the module,but also address the substantial balance of system costs.Here,we demonstrate a counter-intuitive approach based on gallium arsenide solar cells that can achieve extremely low-cost solar energy conversion with an estimated cost of only 3% that of conventional gallium arsenide solar cells using an accelerated,non-destructive epitaxial lift-off wafer recycling process along with a lightweight,thermoformed plastic,truncated mini-compound parabolic concentrator that avoids the need for active solar tracking.Using solar cell/concentrator assemblies whose orientations are adjusted only a few times per year,the annual energy harvesting is increased by 2.8 times compared with planar solar cells without solar tracking.These results represent a potentially drastic cost reduction in both the module and the balance of system costs compared with heavy,rigid conventional modules and trackers that are subject to wind loading damage and high installation costs.展开更多
基金funding support from Universal Display Corporation.
文摘We demonstrate threefold directional light concentration from an organic light-emitting diode luminaire for use in spot lighting and other applications where high intensity illumination is required.The concentrating luminaire comprises four triangular,large-area green electrophosphorescent organic light emitting diodes(PHOLEDs)deposited on plastic substrates and assembled into a pyramidal structure with an open base that serves as the light exit aperture.The PHOLED surfaces are highly reflective to direct the emission from the devices to the aperture independent of the original emission position within the pyramid.The far-field intensity profile of the concentrator has a‘batwing’distribution that meets the requirements for general lighting for uniform illumination of planar surfaces.
文摘Practical solar energy solutions must not only reduce the cost of the module,but also address the substantial balance of system costs.Here,we demonstrate a counter-intuitive approach based on gallium arsenide solar cells that can achieve extremely low-cost solar energy conversion with an estimated cost of only 3% that of conventional gallium arsenide solar cells using an accelerated,non-destructive epitaxial lift-off wafer recycling process along with a lightweight,thermoformed plastic,truncated mini-compound parabolic concentrator that avoids the need for active solar tracking.Using solar cell/concentrator assemblies whose orientations are adjusted only a few times per year,the annual energy harvesting is increased by 2.8 times compared with planar solar cells without solar tracking.These results represent a potentially drastic cost reduction in both the module and the balance of system costs compared with heavy,rigid conventional modules and trackers that are subject to wind loading damage and high installation costs.
