Abstract: The invention provides a lighting unit (100) comprising a light source (10), configured to generate light source light (11) and a luminescent material (20), configured to convert at least part of the light source light (11) into luminescent material light (51), wherein the luminescent material (20) comprises a phosphor (40), wherein this phosphor comprises an alkaline earth aluminum nitride based material having a cubic crystal structure with T5 supertetrahedra, wherein the T5 supertetrahedra comprise at least Al and N, and wherein the alkaline earth aluminum nitride based material further comprises a luminescent lanthanide incorporated therein.

Abstract: A method according to embodiments of the invention includes providing a light emitting semiconductor structure grown on a substrate. The substrate has a front side and a back side opposite the front side. Notches are formed in the substrate. The notches extend from the front side of the substrate into the substrate. After forming notches in the substrate, the back side of the substrate is thinned to expose the notches.

Abstract: Programmable light emitting diode (LED) lighting systems and a method of operating the system are described. An LED may emit a beam of light at a particular location. The LED may sense, an illumination parameter from an external light source on the particular location. The LED may output a current proportionate to the illumination parameter in the particular location to a controller. The controller may provide to the LED a signal to change a parameter of the LED based on a change in the illumination parameter in the particular location.

Abstract: A circuit for dividing a single current source into two or more current channels is disclosed. The circuit may comprise a voltage controlled current source, a first sense resistor to sense a first sensed voltage of a first current channel, a second sense resistor to sense a second sensed voltage of a second current channel, a computational device configured to compare the first sensed voltage to the second sensed voltage to determine an output voltage, a first voltage control switch to power a first LED array, a second voltage control switch to power a second LED array, wherein the output voltage is supplied to the first control switch. The computational device may be a computational circuit or a microcontroller.

Abstract: The escape surface of a light emitting element includes features that include sloped surfaces that have angles of inclination that are based on the direction of peak light output from the light emitting element. If the light output exhibits a number of lobes at different directions, the sloped surfaces may have a corresponding number of different angles of inclination. To minimize the re-injection of light into adjacent features, adjacent features may be positioned to avoid having surfaces that directly face each other. The features may be shaped or positioned to provide a pseudo-random distribution of inclined surfaces across the escape surface, and multiple roughening processes may be used.

Abstract: A method and apparatus are described herein for capturing images of plants using a broad spectrum camera while illuminating the plants with specific light wavelengths from light sources such as light emitting diodes (LEDs). A first light source may be activated, wherein the first light source emits light having a first spectrum toward a bed of a plurality of plants. On a condition that the first light source is activated, a first image of the bed of the plurality of plants may be captured with a broad spectrum camera. A second light source may be activated, wherein the second light source emits light having a second spectrum toward the bed of the plurality of plants. On a condition that the second light source is activated, a second image of the bed of the plurality of plants may be captured with the broad spectrum camera.

Abstract: A laser-based light source comprises a laser, an optical fiber, a conversion device, and a detector, the laser for emitting laser light with a laser peak emission wavelength, the optical fiber for guiding the laser light for being received at a first surface of the conversion device, the conversion device for converting at least a part of the laser light to converted light with a peak emission wavelength being longer than the laser peak emission wavelength, the optical fiber further for guiding a part of the converted light back in the direction of the laser and the detector for detecting at least a part of the back guided converted light. A vehicle headlight comprises such a laser-based light source, and a lighting system comprises such a vehicle headlight.

Abstract: A lighting arrangement includes at least a first and a second LED lighting element arranged next to each other on a carrier surface. The spacer element has, at least in a portion thereof which is in contact with the second LED lighting element, a width which is less than 20% of a width of the first LED lighting element. The first LED lighting element comprises a spacer element projecting into a direction in parallel to the carrier surface. The second LED lighting element is arranged in contact with the spacer element such that it is arranged aligned relative to the first LED lighting element, and such that the first and second LED lighting elements are arranged at a distance forming a gap between the first and second LED lighting elements.

Abstract: Embodiments of the invention include a semiconductor light emitting device capable of emitting first light having a first peak wavelength and a semiconductor wavelength converting element capable of absorbing the first light and emitting second light having a second peak wavelength. The semiconductor wavelength converting element is attached to a support and disposed in a path of light emitted by the semiconductor light emitting device. The semiconductor wavelength converting element is patterned to include at least two first regions of semiconductor wavelength converting material and at least one second region without semiconductor wavelength converting material disposed between the at least two first regions.

Abstract: A light emitting device comprises a detector circuit and a light emitting diode (LED) die. The LED die includes a semiconductor stack grown on a substrate. The LED includes an emitter segment formed from one segment of the semiconductor stack. The LED die includes a photosensor segment formed from another segment of the semiconductor stack. The LED die includes a segmentation layer formed between the emitter segment and the photosensor segment. The segmentation layer electrically isolates the emitter segment from the photosensor segment. The LED die includes first electrodes configured to provide power to energize the emitter segment. The LED die includes second electrodes configured to send the current to the detector circuit. The detector circuit is configured to convert the current to a signal which provides operational feedback with respect to the emitter segment.

Abstract: Methods and apparatus are described. An apparatus includes a hexagonal oxide substrate and a III-nitride semiconductor structure adjacent the hexagonal oxide substrate. The III-nitride semiconductor structure includes a light emitting layer between an n-type region and a p-type region. The hexagonal oxide substrate has an in-plane coefficient of thermal expansion (CTE) within 30% of a CTE of the III-nitride semiconductor structure.

Abstract: A circuit for dividing a single current source into two or more current channels is disclosed. The circuit may comprise a voltage controlled current source, a first sense resistor to sense a first sensed voltage of a first current channel, a second sense resistor to sense a second sensed voltage of a second current channel, a computational device configured to compare the first sensed voltage to the second sensed voltage to determine an output voltage, a first voltage control switch to power a first LED array, a second voltage control switch to power a second LED array, wherein the output voltage is supplied to the first control switch. The computational device may be a computational circuit or a microcontroller.

Abstract: A lighting circuit and methods of manufacturing and controlling a lighting circuit are described. The lighting circuit includes a first array of semiconductor light sources, a separate second array of semiconductor light sources, and a shared array of semiconductor light sources. A first driver is electrically coupled to provide a first drive current to the first array and the shared array. A second driver is electrically coupled to provide a second drive current to the shared array and the second array.

Abstract: A light emitting diode (LED) device may include an LED die having a first surface on a substrate. A first phosphor layer may be formed on a second surface and sides of the LED die. The second surface may be opposite the first surface. A second phosphor layer may be formed on the first phosphor layer. The second phosphor layer may have a peak emission wavelength (Lpk2) located between a peak emission wavelength of the LED die (LpkD) and a peak emission wavelength of the first phosphor layer (Lpk2).

Abstract: A lighting device includes LED lighting elements arranged at a distance from each other. A leadframe comprising conductor segments interconnecting the LED lighting elements. The LED lighting elements each comprise an LED die element attached to one of the conductor segments of the leadframe. The LED lighting elements further each comprise a holding element disposed to hold at least two of the conductor segments of the leadframe which are partially embedded within one of the holding elements. In order to obtain good optical properties, the holding elements do not cover the LED die elements. According to the proposed manufacturing method, conductor segments of the leadframe are provided and holding elements are formed at a distance from each other, each partially embedding at least two conductor segments. Mounting portions on the conductor segments are not covered by the holding elements. LED die elements are attached to the mounting portions.

Abstract: Techniques and devices are provided for sensing image data from a scene and activating primary light sources based on information sensed from the scene. Subsets of a plurality of primary light sources may be activated to emit sensing spectrum of light onto a scene. Combined image data may be sensed from the scene while the subsets of the plurality of primary light sources are activated. Reflectance information for the scene may be determined based on the combined image data and combined sensing spectra. Spectrum optimization criteria for the primary light sources may be determined based on the reference information and a desired output parameter provided by a user or determined by a controller. The plurality of primary light sources may be activated to emit a lighting spectrum based on the spectrum optimization criteria.

Abstract: A system including an image capture system with a sensing efficiency that varies over a field of view of the image capture system may employ shaped illumination to compensate for the variation in the sensing efficiency. An illuminator may be configured to illuminate the field of view of the image capture system with illumination shaped to have higher intensity where the sensing efficiency is lower, e.g., at the periphery of the field over view. The imaging system may thus provide image data with more uniform signal-to-noise ratios. Image data from an illuminated scene may be manipulated using data from a non-illuminated scene to produce improved image data.

Abstract: The invention provides a method for the production of a luminescent material, (10) based on coated quantum dots (100), comprising: (i) providing luminescent quantum dots (100) in a liquid medium (20) wherein the luminescent quantum dots (100) have an outer layer (105) comprising first cations and first anions; and (ii) providing in a coating process a coating (120) on the outer layer (105) of the quantum dots (100) in the liquid medium (20), wherein the coating (120) comprises a silica coating; wherein during the coating process, or after the coating process, or during and after the coating process, the liquid medium (20) comprises one or more of a third element and a fourth element, wherein the first cation and the third element belong to the same group of the periodic system, and wherein the first anion and the fourth element belong to the same group of the periodic system.

Abstract: A light-emitting device package includes a metalized substrate, a light-emitting diode (LED) die, and a single primary optic. The metalized substrate includes a top surface, pads on the top surface, and traces extending from the pads. The LED die is mounted on the pads of the metalized substrate. The LED die includes individually addressable segments. Each segment includes one or more junctions. The primary optic is located over the LED die.

Abstract: A Light Emitting Device (LED) that has increased reliability and efficiency. Specifically, the LED may be formed using Atomic Layer Deposition to improve the thermal conductivity between the ceramic plate and the LED, decrease the amount of organic contamination, and increase the efficiency of the optical output of the LED.