Wavelength converters with improved thermal conductivity and lighting devices including the same
AssigneeOSRAM Opto Semiconductors GmbH
InventorsMaria Anc, Mark Hannah
Life of this patent
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Abstract
Wavelength converters (103) with improved thermal conductivity are described. In some embodiments the wavelength converters include a thermally conductive component (204, 206) and a wavelength conversion material (205) mixed with or dispersed in the thermally conductive component. The wavelength conversion material (205) includes non-agglomerated quantum dots. The presence of the thermally conductive component may facilitate removal of heat from the wavelength converter, potentially reducing the impact of elevated temperature on the performance of the wavelength conversion material therein. Methods of making such wavelength converters and lighting devices including such wavelength converters are also described.
Claims13
A lighting device comprising:
- a wavelength converter consisting essentially of a layer of a mixture of a wavelength conversion material and thermally conductive particles,
- wherein the wavelength conversion material comprises non-agglomerated quantum dots, and
- wherein the thermally conductive particles are particles of at least one material having a thermal conductivity greater than or equal to about 4 Wm−1K−1.
A lighting device comprising:
- a wavelength converter, wherein the wavelength converter comprises a layer comprising:
- a thermally conductive component;
- and
- a wavelength conversion material mixed with or dispersed in the thermally conductive component,
- wherein the wavelength conversion material comprises non-agglomerated quantum dots,
- wherein the thermally conductive component is at least one thermally conductive polymer, and
- wherein the thermally conductive polymer has a thermal conductivity greater than 0.2 Watts per meter Kelvin (Wm−1K−1).
A lighting device comprising:
- a wavelength converter, wherein the wavelength converter comprises a layer comprising:
- a thermally conductive component;
- and
- a wavelength conversion material mixed with or dispersed in the thermally conductive component,
- wherein the wavelength conversion material comprises non-agglomerated quantum dots,
- wherein the thermally conductive component is formed of at least one thermally conductive polymer and thermally conductive particles,
- wherein the thermally conductive polymer has a thermal conductivity greater than 0.2 Watts per meter Kelvin (Wm−1K−1), and
- wherein the thermally conductive particles are particles of at least one material having a thermal conductivity greater than or equal to about 4 Wm−1K−1.
Dependencies are inferred from the claim text.