Abstract: A compact LED lighting unit, (1) for camera flash applications, comprising a reflective housing having (14) having a reflective base (15) and an open top (51); an LED (10) mounted within the reflective housing (14) and a beam shaping foil stack (12) provided over the open top of the housing (14); wherein, the foil stack (12) comprises first and second microstructured sheets (50, 52), each having an array of elongate locally parallel ridges (41) facing away from the LED, wherein the ridges of one sheet locally cross the ridges of the other sheet by an angle in the range 30 to 150 degrees.

Abstract: A wavelength converting member is provided, comprising a sealed capsule at least partly made of sintered polycrystalline ceramic, for example sintered polycrystalline alumina, said capsule defining at least one sealed cavity; and—a wavelength converting material contained within said sealed cavity. The wavelength converting member has high total forward transmission of light, high thermal conductivity, high strength and provides excellent protection for the wavelength converting member against oxygen and water. The wavelength converting member can advantageously be applied in a light emitting arrangement or as a color wheel for a digital image projector.

Abstract: The present invention relates to a method for providing a reflective coating (114) to a substrate (104) for a light-emitting device (112), comprising the steps of: providing (201) a substrate (104) having a first surface portion (116) with a first surface material and a second surface portion (106, 108) with a second surface material different from the first surface material; applying (202) a reflective compound (401) configured to attach to said first surface material to form a bond with the substrate (104) in the first surface portion (116) that is stronger than a bond between the reflective compound (401) and the substrate (104) in the second surface portion (106, 108); curing (203) said reflective compound (401) to form a reflective coating (114) having said bond between the reflective coating (114) and the substrate (104) in the first surface portion (116); and subjecting said substrate (104) to a mechanical treatment with such an intensity as to remove (205) said reflective coating (114) from said secon

Abstract: An LED lighting unit comprising a support structure (14), an LED-based light emitting structure (10) mounted within the support structure and an optical beam shaping arrangement (50, 52) over the top of the support structure. The optical beam shaping arrangement comprises an optically transparent and thermally stable material, and the support structure supports the microstructured layer at a small height above the LED-based light emitting structure. This height may for example be less than 0.5 mm. The optical beam shaping arrangement enables a compact and low height lighting unit to be mounted on a carrier by reflow soldering without damaging the optical beam-shaping component.

Abstract: A light emitting module includes at least one LED mounted on a reflective base and surrounded by reflective walls to form a cavity. A partially diffusive layer containing a phosphor is mounted above the LED with a gap therebetween. Some of the light emitted by the phosphor is backscattered toward the LED, base, and walls. The LED absorbs a significant amount of the light, while the reflective base and walls efficiently reflect over 90% of the light back toward the phosphor layer for exiting the module. Various equations are provided that allow the designer to select an optimal gap between the LED and the partially diffusive layer to maximize light extraction efficiency out of the diffusive layer. The optimal gap range for maximizing light extraction efficiency is a product of LED largest linear length, LED surface area, base area, wall area, and reflective coefficients of the various elements.

Abstract: A lighting device is disclosed, which comprises a light transmitting element extending along a perimeter such that a hollow is defined by the light transmitting element. The light transmitting element comprises a light in-coupling surface adapted to couple light emitted by at least one light emitting element into the light transmitting element, and a light out-coupling surface adapted to couple light out of the light transmitting element. The lighting device is combined with a light reflecting envelope arranged to enclose the lighting device such that light emitted from the light out-coupling surface is reflected at an inner surface of the envelope. Thereby a reflected image may be produced, having an appearance resembling a candle flame.

Abstract: The generally Lambertian LED die emission is modified by an optical structure formed over the LED die that reduces the light emission along a normal axis and enhances the light emission at an angle with respect to the normal axis, producing a certain light emission profile. A phosphor layer is provided overlying the optical structure, such as in a reflective light-mixing chamber. The light emission profile results in more uniform flux from the LED die impinging across the surface of the phosphor. Some of the LED light passes through the phosphor and some of the light is converted to light of a different wavelength. The light emission profile results in more uniform color and temperature across the phosphor. The light emission profile may be created by a lens, a patterned layer over the LED die, a semi-reflective layer over the LED die, an optical sheet, or other technique.

Abstract: The present invention relates to lighting module, wherein a light exit window (12) of the lighting module is engraved such that the output color temperature of said lighting module is tuned. The present invention also relates to a method for tuning an output color temperature of a lighting module, said method comprising providing said lighting module comprising a light exit window (12), and a light source arranged to provide light having an optical path through said light exit window (12), said lighting module having a first output color temperature; and engraving a surface of said light exit window (12) such that the output color temperature of said lighting module is tuned to a second output color temperature.

Abstract: An illumination device is manufactured by providing (101) a substrate (1) having a first side (1a), sealingly coupling (106) an at least partially light transmitting cover (2) to the substrate (1) such that an enclosed space (3) is defined by at least the first side (1a) of the substrate (1) and the cover (2), providing a through-hole (4) into the enclosed space (3), and introducing (107) a luminescent material into the enclosed space (3) via the through-hole (4). By hermetically sealing (108) the through-hole (4) after the introduction of the luminescent material, the enclosed space (3) becomes sealed and hence luminescent materials being relatively sensitive to e.g. water and/or oxygen become protected from exposure to the environment.

Abstract: A wavelength converting member is provided, comprising a sealed capsule at least partly made of sintered polycrystalline ceramic, for example sintered polycrystalline alumina, said capsule defining at least one sealed cavity; and—a wavelength converting material contained within said sealed cavity. The wavelength converting member has high total forward transmission of light, high thermal conductivity, high strength and provides excellent protection for the wavelength converting member against oxygen and water. The wavelength converting member can advantageously be applied in a light emitting arrangement or as a color wheel for a digital image projector.

Abstract: A light emitting module 150 emits light through a light exit window 104 and comprises a base 110, a solid state light emitter 154, 156 and a partially diffusive reflective layer 102. The base 110 has a light reflective surface 112 which faces towards the light exit window 104. The light reflective surface 112 has a base reflection coefficient Rbase which i defined by a ratio between the amount of light that is reflected by the light reflective surface and the amount of light that impinges on the light reflective surface. The solid state light emitter 154, 156 emits light of a first color range 114, comprises a top surface 152, 158 and has a solid state light emitter reflection coefficient R_SSL which is defined by a ratio between the amount of light that is reflected by the solid state emitter 154, 156 and the amount of light that impinges on the top surface 152, 158 of the solid state light emitter 154, 156. The light exit window 104 comprises at least a part of the partially diffusive reflective layer 102.

Abstract: The present invention relates to a LED module which converts pump light from a LED chip (120) to light at another wavelength, which is emitted from the module. The conversion takes place in a portion of a luminescent material (124). The color purity of the LED module is enhanced by reducing any leakage of pump light using a reflector in combination with an absorber. In one embodiment, the absorber is integrated as one or several thin absorbing layers between the layers of a multi-layer reflection filter (126); this may yield an even higher reduction of pump light leakage from the module.

Abstract: An optical composition is provided, comprising: —a polysilsesquioxane comprising repeating units of the formula [R—SiO1.5], wherein each R independently is hydrogen or a C1-C12 alkyl, aryl, alkene, arylene, alkenyl or alkoxy; —a polysiloxane, optionally substituted; and —particles dispersed in said polysiloxane. The polysilsesquioxane is able to disperse the particles in the polysiloxane, thus providing an optical composition comprising stably dispersed particles. The particles may be utilized to tune the refractive index or another optical property of the composition. Due to the low organics content, the composition has reduced risk of yellowing. The invention also relates to a bonding layer comprising an optical composition, an optical system comprising an optical composition, a method for preparing an optical composition and an optical system, respectively, and the use of a polysilsesquioxane for dispersing particles in a polysiloxane material.

Abstract: The invention relates to a composition comprising a binder material and nanoparticles having an average particle size of 100 nm or less having a first refractive index of at least 1.65 in respect of light of a first wavelength, and a second refractive index in the range of 1.60-2.2 in respect of light of a second wavelength, wherein said first refractive index is higher than said second refractive index, and wherein the first and second refractive indices may be tuned by adjusting the volume ratio of the nanoparticles to the binder material. The composition may improve light extraction when used for bonding a ceramic member to an LED, and/or may reduce the amount of light that is directed back towards the LED.

Abstract: A light emitting module (150) emits light through a light exit window (104) and comprises a base (110), a solid state light emitter (154, 158) and a partially diffusive reflective layer (102). The base (110) has a light reflective surface (112) which faces towards the light exit window (104). The light reflective surface (112) has a base reflection coefficient Rbase which is defined by a ratio between the amount of light that is reflected by the light reflective surface and the amount of light that impinges on the light reflective surface. The solid state light emitter (154, 158) emits light of a first color range (114), comprises a top surface (152, 158) and has a solid state light emitter reflection coefficient R_SSL which is defined by a ratio between the amount of light that is reflected by the solid state emitter (154,156) and the amount of light that impinges on the top surface (152, 158) of the solid state light emitter (1154, 156).

Abstract: The present invention relates to a method for providing a reflective coating (114) to a substrate (104) for a light-emitting device (112), comprising the steps of: providing (201) a substrate (104) having a first surface portion (116) with a first surface material and a second surface portion (106, 108) with a second surface material different from the first surface material; applying (202) a reflective compound (401) configured to attach to said first surface material to form a bond with the substrate (104) in the first surface portion (116) that is stronger than a bond between the reflective compound (401) and the substrate (104) in the second surface portion (106, 108); curing (203) said reflective compound (401) to form a reflective coating (114) having said bond between the reflective coating (114) and the substrate (104) in the first surface portion (116); and subjecting said substrate (104) to a mechanical treatment with such an intensity as to remove (205) said reflective coating (114) from said secon

Abstract: A light emitting module 150 emits light through a light exit window 104 and comprises a base 110, a solid state light emitter 154, 156 and a partially diffusive reflective layer 102. The base 110 has a light reflective surface 112 which faces towards the light exit window 104. The light reflective surface 112 has a base reflection coefficient Rbase which i defined by a ratio between the amount of light that is reflected by the light reflective surface and the amount of light that impinges on the light reflective surface. The solid state light emitter 154, 156 emits light of a first color range 114, comprises a top surface 152, 158 and has a solid state light emitter reflection coefficient R_SSL which is defined by a ratio between the amount of light that is reflected by the solid state emitter 154, 156 and the amount of light that impinges on the top surface 152, 158 of the solid state light emitter 154, 156. The light exit window 104 comprises at least a part of the partially diffusive reflective layer 102.

Abstract: The present invention relates to an optical element for a light emitting device, wherein the optical element comprises a sintered ceramic body (3) comprising a wavelength converting layer (4) and a scattering layer (5), and to a method of manufacturing thereof. More specifically, the invention relates to an optical element, comprising a sintered ceramic body (3) of a first layer (4) and a second layer (5) arranged on the first layer, wherein the first layer comprises a wavelength converting material, the porosity of the second layer is higher than the porosity of the first layer, and pores in the second layer are arranged to provide scattering of a light beam.

Abstract: An optical element includes a first optical member with at least one indentation at a first surface thereof, and a second optical member attached to the first surface. The second optical member conforms to the at least one indentation in the first optical member. The optical element further includes at least one reflector at an interface between the first and second optical members, where the at least one reflector is located at the at least one indentation. The reflector is formed by an interface between a cavity formed between the first and second optical members and at least one of the first and second optical members.

Abstract: A side-emitting light emitting device (100) is provided, comprising at least one light emitting diode (101) arranged on a substrate (102) and facing a scattering reflector (103, 109) disposed at a distance from and extending along the extension of said substrate. The reflector comprises a plurality of non-parallel oriented reflective flakes (112) distributed in a transmissive carrier (113), such that light incident thereon from any angle of incidence is reflected and scattered. The scattering action of the reflector gives rise to an angular redistribution in the device, which increases the chance of light exiting the device through lateral openings between the reflector and the substrate, while the opacity of the reflector prevents light from being emitted through the top surface.