A light diffuser includes: a thermoplastic resin base which has a thermal expansion coefficient of at least 4×10.sup.−5/K and at most 8×10.sup.−5/K; and a light diffusion layer which is disposed on a surface of the thermoplastic resin base and includes an acrylic resin film and an acrylic resin particle, the acrylic resin film including one or more acrylic resins having a glass transition temperature of at least 30° C. and at most 50° C., the acrylic resin particle being included in the acrylic resin film and having an average particle size of at least 1 μm and at most 15 μm.

A light diffuser includes: a thermoplastic resin base which has a thermal expansion coefficient of at least 4×10.sup.−5/K and at most 8×10.sup.−5/K; and a light diffusion layer which is disposed on a surface of the thermoplastic resin base and includes an acrylic resin film and an acrylic resin particle, the acrylic resin film including one or more acrylic resins having a glass transition temperature of at least 30° C. and at most 50° C., the acrylic resin particle being included in the acrylic resin film and having an average particle size of at least 1 μm and at most 15 μm.

A tunable light generating assembly uses ultraviolet and blue light emitting diodes to pump red and green quantum dots in a quantum dot layer to generate white light. A dielectric mirror substrate having a wavelength selective reflectance is configured to reflect ultraviolet wavelengths, and to pass blue and longer wavelengths. The portion of the ultraviolet light that is not absorbed in the quantum dot layer is reflected rather than transmitted, where it has another chance to be absorbed in the quantum dot layer, thereby increasing the overall conversion efficiency. The increased energy associated with the ultraviolet light further results in greater conversion efficiency in the quantum dot layer. The ultraviolet and blue LEDs may be driven by an electronic circuit that varies the amount of power applied to each LED to control the brightness and color balance of the generated white light.

A multilayer structure comprising a base layer comprising at least one transparent thermoplastic and a specific inorganic infra-red absorber as well as an IR-reflecting multi-ply layer, the production of such a multilayer structure and the use thereof for the production of glazing made of plastic in buildings, automobiles, rail vehicles and aircraft.

An infrared ray shielding film having a metal particle-containing layer in which hexagonal to circular tabular metal particles are contained in 60% by number or more relative to total number of the metal particles contained in the metal particle-containing layer exhibits excellent infrared ray reflection at a wide range of from 800 nm to 2000 nm and shows little heat ray absorption.

A light emitting assembly 100, a lamp and a luminaire are provided. The light emitting assembly 100 comprises a first light source 112, a second light source 118, a first luminescent material 106, a second luminescent material 116 and a light exit window 102. The first light source 112 emits light 110 in a Ultra Violet spectral range. The second light source 118 emits light in a blue spectral range having a first peak wavelength. The first luminescent material 106 is arranged to receive light 110 from the first light source 112 and is configured to absorb light 110 in the Ultra Violet spectral range and to convert a portion of the absorbed light towards light 104 in the blue spectral range. The second luminescent material 116 is arranged to receive light 105 from the second light source 118 and is configured to almost fully convert the received light 105 in the blue spectral range received from the second light source to light with a spectral range of light having a second peak wavelength. The second peak wavelength is larger than the first peak wavelength. The light exit window 102 is arranged to transfer light emitted by the first luminescent material 106 and by the second luminescent material 116 into an ambient of the light emitting assembly 100.

A light emitting assembly 100, a lamp and a luminaire are provided. The light emitting assembly 100 comprises a first light source 112, a second light source 118, a first luminescent material 106, a second luminescent material 116 and a light exit window 102. The first light source 112 emits light 110 in a Ultra Violet spectral range. The second light source 118 emits light in a blue spectral range having a first peak wavelength. The first luminescent material 106 is arranged to receive light 110 from the first light source 112 and is configured to absorb light 110 in the Ultra Violet spectral range and to convert a portion of the absorbed light towards light 104 in the blue spectral range. The second luminescent material 116 is arranged to receive light 105 from the second light source 118 and is configured to almost fully convert the received light 105 in the blue spectral range received from the second light source to light with a spectral range of light having a second peak wavelength. The second peak wavelength is larger than the first peak wavelength. The light exit window 102 is arranged to transfer light emitted by the first luminescent material 106 and by the second luminescent material 116 into an ambient of the light emitting assembly 100.

An integrated light source includes: an emissive radiation source having a first spectrum: an optical element located to direct emissions from the emissive radiation source: a volumetric spectrum converter located to convert emissions directed from the emissive radiation source to emissions having a second spectrum different from the first spectrum; an optical reflector located about the converter; an output filter, the reflector being located to reflect die converter emissions towards the output filter; and a package body having an internal cavity containing the emissive radiation source, optical element, converter, reflector, and filter, wherein desired light radiates from the cavity through the filter.

An optical filter includes a colloidal crystal layer including: a plurality of particles including at least one of an inorganic material or a resin material; and a binder disposed between the plurality of particles. The optical filter reflects a part of light in the wavelength range of 300 nm or more and less than 800 nm. A multiplex optical filter includes multiple optical filters. A light emitting device includes the optical filter and a light source, and a part of primary light emitted from the light source is transmitted through the optical filter.

An optical filter includes a colloidal crystal layer including: a plurality of particles including at least one of an inorganic material or a resin material; and a binder disposed between the plurality of particles. The optical filter reflects a part of light in the wavelength range of 300 nm or more and less than 800 nm. A multiplex optical filter includes multiple optical filters. A light emitting device includes the optical filter and a light source, and a part of primary light emitted from the light source is transmitted through the optical filter.