E.i. Dupont De Nemours and Company

Mark E Lewittes

Jose Manuel Rodriguez-Parada

Roger Harquail French

Ronald Jack Riegert

Kostantinos Kourtakis

Richard Allen Hayes

Marc Bruce Goldfinger

Mark Gerrit Roelofs

Lee A Silverman

Robert Vincent Canning, Jr

Stephen A Perusich

Christopher Marc Doyle

Barry Rubin

Michael J Merrill

Thomas W Simpson, Iii

Govindarajulu Rajendran

Wayne E Marsh

Rebekah Ann Derryberry

An optical element has a plano-plano body formed of a first material having a greater refraction index nand a second material having a lesser refraction index n. Both indices are greater than one. The absolute value of the index contrast, log(n/n), is in the range from about 0.001 to about 0.17, preferably from about 0.01 to about 0.05. The materials have an induced absorbance rate &#x394;Abs/Dose less than or equal to about 0.4, preferably less than or equal to about 0.2. The materials are arranged such that an interface with at least one cusp is defined therebetween. The cusp has an apex pointed toward the material having the greater index of refraction. The cusp is operative to produce a region of increased light intensity on one surface of the optical element in response to light incident on the other surface of the optical element.

Optical element producing a modulated region of increased light intensity and optically enhanced photovoltaic cell and LED lighting device including the same

A photovoltaic assembly includes an optical element comprising a body having opposed planar major surfaces with a plurality of open-mouthed inclusions (grooves) formed on the light output surface. Each groove has a closed apex with an included apex angle. The body is formed from a material having an index of refraction of at least 1.3 and an induced absorbance rate &#x394;Abs/Dose less than or equal to about 0.4. The optical element is attached to a photovoltaic cell using an adhesive having an index of refraction in the range from about 1.34 to 1.50. The apex angle is selected such that light incident upon the body is conveyed the light output surface by the mechanism of total internal reflection from the boundary walls of the grooves and/or without retro-reflection toward the incident surface. The thickness of the adhesive layer and the dimension of the mouth of the grooves are selected such that light incident on the surface of the photovoltaic cell is not obscured by conductor lines on the cell's surface.

Photovoltaic assemblies incorporating an optical element having internal inclusions configured for maximum conversion efficiency

The present invention discloses a multi-layer fluoropolymeric film that is useful as a light capture front sheet in solar modules, and more broadly as an antireflection layer. The present invention further discloses a glass shaped article having a multi-layer fluoropolymeric film disposed upon the surface thereof. The shaped article is useful in applications where it is desirable to reduce reflection of incident light.

Multi-layer fluoropolymeric film and articles incorporating such films

An optical element comprises a body having opposed planar major surfaces with a plurality of open-mouthed inclusions (grooves) formed on its light output surface. Each groove has a closed apex with an included apex angle. The body is formed from a material having an index of refraction of at least 1.3 and an induced absorbance rate &#x394;Abs/Dose less than or equal to about 0.4. The apex angle is selected such that light incident upon the body is conveyed the light output surface by the mechanism of total internal reflection from the boundary walls of the grooves and/or without retro-reflection toward the incident surface.

Optical element having internal inclusions configured for maximum conversion efficiency

The present invention discloses photovoltaic modules with a multi-layer fluoropolymeric film wherein the reflectance spectrum of the multi-layer fluoropolymeric film exhibits at least one minimum in the wavelength between 400 and 1100 nm. The film is useful as a light capture front sheet in solar modules, and more broadly as an antireflection layer. The invention further discloses photovoltaic arrays formed from such modules.

Photovoltaic module with multi-layer fluoropolymeric film

Provided is a composition comprising a nonmicellar twisted nematic liquid crystal having cholesteric near infrared-reflecting properties and at least one near infrared absorptive material. This composition reduces the transmission of near infrared radiation. The composition can be used as a layer, optionally in conjunction with polymeric films, polymeric sheets, rigid sheets, and the like, to form multilayer laminates. In some embodiments these multilayer laminates are useful as solar control windows or window films to reduce energy consumption necessary to cool the interior of a structure such as an automobile or building.

Composition for reducing the transmission of infrared radiation

An improved image analysis method to quantify uniformity of visual appearance of planar objects. The measurements are substantially independent of both the image shading and the overall lightness differences among the objects.

Method of quantifying visual uniformity of planar objects

Disclosed is a highly conductive polymer electrolyte membrane and a process for producing it. This invention also describes batteries which employ the polymer electrolyte membrane of this invention.

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Wilmington, DE, United States of America

Mark E Lewittes