Abstract: A lighting device (100, 300, 400) is disclosed. The lighting device comprises a light source (110, 310, 410), an at least partially light transmitting envelope (120, 320, 420) and a dispenser (140, 340, 440). The envelope is arranged to define a sealed space (130, 330, 430) in which at least a portion of the light source is arranged. Further, the dispenser comprises a chemically reactive substance and is adapted to gradually release at least some of the chemically reactive substance to the sealed space so as to reduce contaminants and by-products that may be present in the sealed space.

Abstract: A composition may include a polymer matrix and a light scattering component disposed in the polymer matrix. The light scattering component includes nanoparticles of a polydisperse particle size distribution. Each of at least 60% of the nanoparticles has a particle size of less than 100 nm and each of 80-100% of the nanoparticles has a particle size of less than 200 nm.

Abstract: The present invention relates to a lighting device (100) to stimulate plant growth and bio-rhythm of a plant. The lighting device (100) comprising a solid state light source (102) arranged to emit direct red light having a wavelength of 600 to 680 nm, preferably 640 to 680 nm, and a wavelength converting member (106) arranged to receive at least part of said direct red light emitted from said solid state light source (102) and to convert said received direct red light to far-red light having a maximum emission wavelength of 700 to 760 nm, preferably 720 to 760 nm.

Abstract: Luminaires and lighting system are disclosed. In one embodiment a luminaire includes a housing formed by a single non-metallic extruded piece, where the housing includes an outer wall and an inner wall, a reflector formed on or by an inner surface of the inner wall, and a retainer bracket disposed adjacent the reflector and configured to secure a light emitting element such that at least a portion of light emitted via the light emitting element reflects from the reflector.

Abstract: The invention provides a lighting device for providing light, the lighting device comprising a closed chamber with a light transmissive window and a light source configured to provide light source radiation into the chamber, wherein the chamber further encloses a wavelength converter configured to convert at least part of the light source radiation into wavelength converter light, wherein the light transmissive window is transmissive for the wavelength converter light, wherein the wavelength converter comprises luminescent quantum dots which upon excitation with at least part of the light source radiation generate at least part of the wavelength converter light, and wherein the closed chamber comprises a filling gas comprising one or more of helium gas, hydrogen gas, nitrogen gas or oxygen gas, the filling gas having a relative humidity at 19° C. of at least 5%.

Abstract: The invention provides a lighting unit (10) comprising (a) a lighting device (100), (b) a support (200), and (c) an envelope (300), wherein: —the lighting device (100) is configured to provide lighting device light (101); wherein the lighting device (100) comprises a light source (110); —the support (200) is configured to support the light source (110); wherein the 5 support (200) comprises a laminate of layers, wherein the laminate of layers comprises an electrically conductive first layer, an electrically non-conducive second layer), and a third layer, wherein the first layer comprises copper, wherein the second layer comprises an epoxy-based material, and wherein the third layer comprises an oxygen barrier material; —the envelope (300) is configured to provide a sealed space (310) enclosing the 10 light source (110) and at least part of the support (200); wherein the envelope (300) comprises an envelope part (320) transmissive for the lighting device light (101), and wherein the sealed space (310) comprise

Abstract: The invention provides a lighting device comprising (a) a light converter comprising a light receiving face; and (b) a solid state light source configured to generate a light source light with a photon flux of at least 10 W/cm2 at the light receiving face, wherein the light converter is configured to convert at least part of the light source light into light converter light having a first frequency, wherein the light converter comprises a semiconductor quantum dot in an optical structure selected from a photonic crystal structure and a plasmonic structure, wherein the optical structure is configured to increase the photon density of states in the light converter resonant with the first frequency for reducing saturation quenching, and wherein the quantum dot has a quantum efficiency of at least 80%.

Abstract: The invention provides a lighting device (1) comprising (a) a light source (10) configured to generate light source light (11), and (b) a light converter (100) configured to convert at least part of the light source light (11) into visible converter light (111), wherein the light converter (100) comprises a matrix (120) containing an organic luminescent material (140) of the benzoxanthene derivative type. The lighting device may further comprise a further luminescent material (130).

Abstract: A lighting device (100, 300, 400) is disclosed. The lighting device comprises a light source (110, 310, 410), an at least partially light transmitting envelope (120, 320, 420) and a dispenser (140, 340, 440). The envelope is arranged to define a sealed space (130, 330, 430) in which at least a portion of the light source is arranged. Further, the dispenser comprises a chemically reactive substance and is adapted to gradually release at least some of the chemically reactive substance to the sealed space so as to reduce contaminants and by-products that may be present in the sealed space.

Abstract: A wavelength converting member is provided, comprising a wavelength converting layer comprising an organic wavelength converting compound distributed in a matrix comprising an amorphous or semi-crystalline aromatic polyester wherein the aromatic polyester molecules are predominantly in a randomly oriented state, said wavelength converting member further comprising at least one support element. By avoiding uniaxial or biaxial orientation of the polyester matrix, the organic wavelength converting compound (organic phosphor) is well protected against photo-chemical degradation. The support element ensures the dimensional stability of the polyester matrix at temperature above the glass transition temperature.

Abstract: The invention provides a lighting device for providing light, the lighting device comprising a closed chamber with a light transmissive window and a light source configured to provide light source radiation into the chamber, wherein the chamber further encloses a wavelength converter configured to convert at least part of the light source radiation into wavelength converter light, wherein the light transmissive window is transmissive for the wavelength converter light, wherein the wavelength converter comprises luminescent quantum dots which upon excitation with at least part of the light source radiation generate at least part of the wavelength converter light, and wherein the closed chamber comprises a filling gas comprising one or more of helium gas, hydrogen gas, nitrogen gas or oxygen gas, the filling gas having a relative humidity at 19° C. of at least 5%.

Abstract: The invention provides a lighting device comprising (a) a light converter comprising a light receiving face; and (b) a solid state light source configured to generate a light source light with a photon flux of at least 10 W/cm2 at the light receiving face, wherein the light converter is configured to convert at least part of the light source light into light converter light having a first frequency, wherein the light converter comprises a semiconductor quantum dot in an optical structure selected from a photonic crystal structure and a plasmonic structure, wherein the optical structure is configured to increase the photon density of states in the light converter resonant with the first frequency for reducing saturation quenching, and wherein the quantum dot has a quantum efficiency of at least 80%.

Abstract: The invention provides a lighting device (1) comprising (a) a light source (10) configured to generate light source light (11), and (b) a light converter (100) configured to convert at least part of the light source light (11) into visible converter light (111), wherein the light converter (100) comprises a matrix (120) containing a luminescent material (140) based on derivatives of benzimidazoxanthenoisoquinolinone. The lighting device may further comprise a further luminescent material (130).

Abstract: The invention provides a lighting device (1) comprising (a) a light source (10) configured to generate light source light (11), and (b) a light converter (100) configured to convert at least part of the light source light (11) into visible converter light (111), wherein the light converter (100) comprises a matrix (120) containing a luminescent material (140) based on derivatives of benzimidazoxanthenoisoquinolinone. The lighting device may further comprise a further luminescent material (130).

Abstract: The invention provides a lighting device (1) comprising (a) a light source (10) configured to generate light source light (11), and (b) a light converter (100) configured to convert at least part of the light source light (11) into visible converter light (111), wherein the light converter (100) comprises a matrix (120) containing an organic luminescent material (140) of the benzoxanthene derivative type. The lighting device may further comprise a further luminescent material (130).

Abstract: The present invention relates to a lighting device (100) to stimulate plant growth and bio-rhythm of a plant. The lighting device (100) comprising a solid state light source (102) arranged to emit direct red light having a wavelength of 600 to 680 nm, preferably 640 to 680 nm, and a wavelength converting member (106) arranged to receive at least part of said direct red light emitted from said solid state light source (102) and to convert said received direct red light to far-red light having a maximum emission wavelength of 700 to 760 nm, preferably 720 to 760 nm.

Abstract: A wavelength converting member (102) is provided, comprising a wavelength converting layer (103) comprising an organic wavelength converting compound (105) distributed in a matrix comprising an amorphous or semi-crystalline aromatic polyester wherein the aromatic polyester molecules are predominantly in a randomly oriented state, said wavelength converting member further comprising at least one support element (104). By avoiding uniaxial or biaxial orientation of the polyester matrix, the organic wavelength converting compound (organic phosphor) is well protected against photo-chemical degradation.