Lumileds LLC

Lumileds Holding B.v.

Venkata Ananth Tamma

Toni Lopez

Antonio Lopez-Julia

Kentaro Shimizu

Hisashi Masui

Aimi Abass

Nicola Bettina Pfeffer

Marcel Rene Bohmer

Vernon K Wong

Philipp-Immanuel Schneider

Varun Dev Kakkar

A nano-structure layer is disclosed. The nano-structure layer includes a plurality of nano-photonic structures that are configured in a first configuration such that light incident upon the nanostructured layer below a cut-off angle passes through the nanostructured layer and light incident upon the nanostructured layer above the cut-off angle is reflected back in direction of the incidence.

High brightness directional direct emitter with photonic filter of angular momentum

A semiconductor diode structure has one or more light-emitting active layers and a redirection layer on the back surface that includes one or more of an array of nano-antennae, a partial photonic bandgap structure, a photonic crystal, or an array of meta-atoms or meta-molecules, and exhibits non-specular internal reflective redirection of output light incident thereon within the diode structure. One or both of the front or back surfaces exhibit position-dependent redirection, reflection, or transmission of the output light, including one or both of (i) position-dependent internal reflective redirection of output light incident on the back-surface or (ii) position-dependent internal reflective redirection, or position-dependent transmissive redirection, of output light incident on a front-surface layer or coating. Position dependence of luminance of output light exiting the diode structure can differ from position dependence of emission from the active layer. With uniform emission across the active layer, output light can exhibit position-dependent luminance.

Light-emitting device with internal non-specular light redirection and position-dependent reflection, transmission, or redirection

A light-emitting device includes a semiconductor diode structure with one or more light-emitting active layers, an anti-reflection coating on its front surface, and a redirection layer on its back surface. Active-layer output light propagates within the diode structure. The anti-reflection coating on the front surface increases transmission of active-layer output light incident below the critical angle Θc. Active-layer output light incident on the redirection layer at an incidence angle greater than Θc is redirected to propagate toward the front surface at an incidence angle that is less than Θc. Device output light is transmitted by the front surface to propagate in an ambient medium, and includes first and second portions of the active-layer output light incident on the front surface at an incidence angle less than Θc, the first portion without redirection by the redirection layer and the second portion with redirection by the redirection layer.

Light-emitting device with internal non-specular light redirection and anti-reflective exit surface

A system, method and device for use as a reflector for a light emitting diode (LED) are disclosed. The system, method and device include a first layer designed to reflect transverse-electric (TE) radiation emitted by the LED, a second layer designed to block transverse-magnetic (TM) radiation emitted from the LED, and a plurality of ITO layers designed to operate as a transparent conducting oxide layer. The first layer may be a one-dimension (1D) distributed Bragg reflective (DBR) layer. The second layer may be a two-dimension (2D) photonic crystal (PhC), a three-dimension (3D) PhC, and/or a hyperbolic metamaterial (HMM). The 2D PhC may include horizontal cylinder bars, vertical cylinder bars, or both. The system, method and device may include a bottom metal reflector that may be Ag free and may act as a bonding layer.

Nano-photonics reflector for LED emitters

An adaptive lighting system comprises an array of independently controllable LEDs, and a metalens positioned to collimate, focus, or otherwise redirect light emitted by the array of LEDs. The adaptive lighting system may optionally include a pre-collimator positioned in the optical path between the array of LEDs and the metalens.

LED array with metalens for adaptive lighting

This specification discloses LEDs in which the light emitting active region of the semiconductor diode structure is located within an optical cavity defined by a nanostructured layer embedded within the semiconductor diode structure on one side of the active region and a reflector located on the opposite side of the active region from the embedded nanostructured layer. The reflector may, for example, be a conventional specular reflector disposed on or adjacent to a surface of the semiconductor diode structure. Alternatively, the reflector may or comprise a nanostructured layer. The reflector may comprise a nanostructured layer and a specular reflector, with the nanostructured layer disposed adjacent to the specular reflector between the specular reflector and the active region.

LED with active region disposed within an optical cavity defined by an embedded nanostructured layer and a reflector

A nano-structure layer is disclosed. The nano-structure layer includes an array of nano-structure material configured to receive a first light beam at a first angle of incidence and to emit the first light beam at a second angle greater than the first angle, the nano-structure material each having a largest dimension of less than 1000 nm.

Color uniformity in converted light emitting diode using nano-structures

A light emitting device comprises a semiconductor diode structure configured to emit light, a substrate that is transparent to light emitted by the semiconductor diode structure, and a reflective nanostructured layer. The reflective nanostructured layer may be disposed on or adjacent to a bottom surface of the substrate and configured to reflect toward and through a side wall surface of the substrate light that is emitted by the semiconductor structure and incident on the reflective nanostructured layer at angles at or near perpendicular incidence. Alternatively, the reflective nanostructured layer may be disposed on or adjacent to at least one sidewall surface of the substrate and configured to reflect toward and through the bottom surface of the substrate light that is emitted by the semiconductor structure and incident on the reflective nanostructured layer at angles at or near perpendicular incidence.

High brightness LEDs with non-specular nanostructured thin film reflectors

A device, system and method for producing enhanced external quantum efficiency (EQE) LED emission are disclosed. The device, system and method include a patterned layer configured to transform surface modes into directional radiation, a semiconductor layer formed as a III/V direct bandgap semiconductor to produce radiation, and a metal back reflector layer configured to reflect incident radiation. The patterned layer may be one-dimensional, two-dimensional or three-dimensional. The patterned layer may be submerged within the semiconductor layer or within the dielectric layer. The semiconductor layer is p-type gallium nitride (GaN). The patterned layer may be a hyperbolic metamaterials (HMM) layer and may include Photonic Hypercrystal (PhHc), or may be a low or high refractive index material or may be a metal.

LED emitters with integrated nano-photonic structures to enhance EQE

A system, method and device for collimating the output of a light emitting diode (LED) are disclosed. The system, method and device include an LED substrate including a top surface from which the light is emitted, and an array of subwavelength scattering antennas positioned within the emitted light path, the array of subwavelength scattering antennas configured to select directions of scatter of the LED emitted light to provide collimated light output from the device. The array may be aligned perpendicular to the plane of propagation of the light emitted from the LED and may be positioned adjacent to the top surface. The array may be at least partially, or completely, positioned within the LED substrate. The array may be spaced a distance from the top surface and the spacing may be achieved using a dielectric spacer adjacent to the top surface. The array may be positioned within the dielectric spacer.

Nanostructured meta-materials and meta-surfaces to collimate light emissions from LEDs

A device including a phosphor layer having a plurality of holes or pockets arranged within the phosphor layer to reduce lateral light transmission. The phosphor layer can be sized and positioned to extend over a plurality of LED emitter pixels.

Phosphor with light barriers

A light emitting device comprises a plurality of coherent light sources, and a plurality of light scattering structures. Each light scattering structure is located in an optical path for light output from a different corresponding one of the coherent light sources. Each light scattering structure comprises an arrangement of nanoantennas embedded in an electrically responsive material and electrical contacts by which to apply a voltage to the electrically responsive material. Application of a time varying electrical signal causes the refractive index of the electrically responsive material in a light scattering structure to vary and thereby varies light scattering by the nanoantennas in the light scattering structure. This effect may be used to reduce speckle caused by interference of light output by the coherent light sources.

Speckle reduction in VCSEL arrays

A light-emitting device includes a semiconductor diode structure with one or more light-emitting active layers, an anti-reflection coating on its front surface, and a redirection layer on its back surface. Active-layer output light propagates within the diode structure. The anti-reflection coating on the front surface increases transmission of active-layer output light incident below the critical angle &#x398;. Active-layer output light incident on the redirection layer at an incidence angle greater than &#x398;is redirected to propagate toward the front surface at an incidence angle that is less than &#x398;. Device output light is transmitted by the front surface to propagate in an ambient medium, and includes first and second portions of the active-layer output light incident on the front surface at an incidence angle less than &#x398;, the first portion without redirection by the redirection layer and the second portion with redirection by the redirection layer.

A device comprising a light emitting diode (LED) substrate, and a meta-molecule wavelength converting layer positioned within an emitted light path from the LED substrate, the a meta-molecule wavelength converting layer including a plurality of nanoparticles, the plurality of nanoparticles configured to increase a light path length in the wavelength converting layer.

Growing community of inventors

San Jose, CA, United States of America

Venkata Ananth Tamma