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US 12,336,342 B2Granted
Dielectric film coating for full conversion ceramic platelets
AssigneeOSRAM Opto Semiconductors GmbH
InventorsYi Zheng, Dominik Eisert, Georg Rossbach
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Abstract
A wavelength converter may include a phosphor layer and a filter layer where the filter layer may be directly attached to the phosphor layer. The wavelength converter may have an overall thickness ranging from 20 μm to 80 μm. A light emitting device assembly and methods for preparing a wavelength converter and methods for preparing a light emitting device assembly are also disclosed.
Claims9
A wavelength converter comprising:
- a phosphor layer;
- and
- a filter layer;
- wherein the filter layer is directly attached to the phosphor layer and wherein the filter layer comprises:
- a first plurality of sublayers comprising at least one first metal oxide and,
- a second plurality of sublayers comprising at least one second metal oxide,
- wherein the at least one first metal oxide is different from the at least one second metal oxide,
- wherein a first sublayer of the first plurality of sublayers is arranged furthest away from the phosphor layer and comprises a first thickness,
- wherein at least one second sublayer of the first plurality of sublayers comprises a second thickness,
- wherein the first thickness is at least 200% of the second thickness;
- wherein the wavelength converter has an overall thickness ranging from 20 μm to 80 μm, and
- wherein the at least one second sublayer comprising the second thickness is directly attached to the phosphor layer.
9 more elements
Dependencies are inferred from the claim text.