LED cross-linkable phospor coating
AssigneeGeneral Electric Company
InventorsJacob C. Bortscheller, Robert J. Wojnarowski
Life of this patent
Estimating the term…
Abstract
A light source (10) includes a light emitting component (32), such as a UV/blue light emitting diode or laser diode coated with a layer (60) of a phosphor material (64). The phosphor material converts a portion of the light emitted by the light emitting component to light of a longer wavelength, such as yellow light. The thickness d of the layer varies across the light emitting component in relation to the intensity of light emitted by the light emitting component. This maintains a uniform color of the emission from the light source while minimizing the loss in light intensity (brightness) due to the presence of the phosphor.
Claims18
A light source comprising:
- a light emitting component which emits light when a voltage is applied, an intensity of the light varying across the light emitting component at the applied voltage;
- and
- a phosphor-containing material positioned to receive light emitted by the light emitting component, the phosphor-containing material converting at least a portion of the light to light of a different wavelength, the phosphor-containing material having a thickness which varies directly in proportion to the intensity of the light emitted by the light emitting component at the applied voltage, whereby the uniformity of color emission is improved as compared with a uniform thickness layer.
A light source comprising:
- a light emitting component which emits light when a voltage is applied, an intensity of the light varying across the light emitting component at the applied voltage;
- and
- a phosphor-containing material positioned to receive light emitted by the light emitting component and converting a portion of the light to light of a different wavelength, the phosphor-containing material having a thickness which varies directly in proportion to the light passing through the phosphor material at the applied voltage, the thickness being greater in regions where the intensity of the light emitted by the light emitting component is higher and lesser in regions where the intensity of the light emitted by the light emitting component is lower.
A light source comprising:
- a light emitting component which emits light;
- and
- a phosphor-containing material positioned to receive light emitted by the light emitting component and converting a portion of the light to light of a different wavelength, the phosphor-containing material having a thickness which is greater in regions where the intensity of the light emitted by the light emitting component is higher and lesser in regions where the intensity of the light emitted by the light emitting component is lower, the phosphor-containing material being formed from a material which includes:
- a phosphor;
- and
- a light-curable material, which is cured by light emitted by the light emitting component by forming a layer of a phosphor-containing light curable material over the light emitting component;
- energizing the light emitting component for a sufficient period of time to cure a portion of the curable material;
- and
- removing remaining uncured curable material.
A light source with improved color distribution comprising:
- a light emitting component which emits light;
- and
- a phosphor-containing material positioned to receive light emitted by the light emitting component and converting a portion of the light to light of a different wavelength, the phosphor-containing material having a thickness which is greater in regions where the intensity of the light emitted by the light emitting component is higher and lesser in regions where the intensity of the light emitted by the light emitting component is lower, the phosphor containing layer being formed by a method which comprises:
- forming a layer of a phosphor-containing curable material over the light emitting component;
- energizing the light emitting component for a sufficient period of time to cure a portion of the curable material;
- and
- removing remaining uncured curable material.
Dependencies are inferred from the claim text.