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AssigneesYissum Research Development Company of the Hebrew University of Jerusalem, Qlight Nanotech Ltd.
InventorsHagai Arbell, Uri Banin
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Optical conversion layers based on semiconductor nanoparticles for use in lighting devices, and lighting devices including same. In various embodiments, spherical core/shell seeded nanoparticles (SNPs) or nanorod seeded nanoparticles (RSNPs) are used to form conversion layers with superior combinations of high optical density (OD), low re-absorbance and small FRET. In some embodiments, the SNPs or RSNPs form conversion layers without a host matrix. In some embodiments, the SNPs or RSNPs are embedded in a host matrix such as polymers or silicone. The conversion layers can be made extremely thin, while exhibiting the superior combinations of optical properties. Lighting devices including SNP or RSNP-based conversion layers exhibit energetically efficient superior prescribed color emission.
A lighting device comprising a light source for producing exciting light of a first spectral range, and at least one conversion layer located at an output of said light source, the at least one conversion layer comprises semiconductor seeded nanoparticles (SNPs) embedded in a polymer host matrix, said SNPs comprising SNPs having material composition, geometry and shape selected to convert said exciting light of the first spectral range into light of at least one second wavelength comprising three or more primary colours with emission bandwidth having full width half max (FWHM) of below 60 nm for emission in said three or more primary colours, said lighting device thereby emitting light of said at least one second wavelength.
A lighting device comprising a light source for producing exciting light of a first spectral range, and at least one conversion layer located at an output of said light source, the at least one conversion layer comprises semiconductor seeded nanoparticles (SNPs) having material composition, geometry and shape selected to convert said exciting light of the first spectral range into light of at least one second wavelength, said lighting device thereby emitting light of said at least one second wavelength, wherein said at least one conversion layer is configured and operable as a spectral antenna to convert said exciting light of the first spectral range into light of the second wavelengths having balance between different spectral regions such that said light of the second wavelengths is characterized by desired correlated colour temperature (CCT) and color rendering index (CRI).
A lighting device comprising a light source for producing exciting light of a first spectral range, and at least one conversion layer located at an output of said light source, the at least one conversion layer comprises semiconductor seeded nanoparticles (SNPs) having material composition, geometry and shape selected to convert said exciting light of the first spectral range into light of at least one second wavelength, said lighting device thereby emitting light of said at least one second wavelength, wherein said light source is configured to provide colour mixture light having correlated colour temperature (CCT) in the range of 5000-10000K, said at least one conversion layer being configured for converting said colour mixture light to provide emitted light having CCT in the range of 2500-6000K.
Dependencies are inferred from the claim text.