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US 2011/0210361 A1Published application
High efficient phosphor-converted light emitting diode
AssigneeEpistar Corporation
InventorsChien-Wuan WANG, Chih-Chiang Lu, Min-Hsun Hsieh
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Abstract
A light-emitting device and manufacturing method thereof are disclosed. The light-emitting device includes a substrate, a semiconductor light-emitting structure, a filter layer, and a fluorescent conversion layer. The method comprises forming a semiconductor light-emitting structure over a substrate, forming a filter layer over the semiconductor light-emitting structure, and forming a fluorescent conversion layer over the filter layer.
Claims20
A layer structure, comprising:
- a conversion layer adapted to emit a second wavelength light in response to a first wavelength light coming from an outside of the layer structure;
- a first layer having a light reflectivity of more than 50% to the second wavelength light, and separated from the conversion layer by a first boundary;
- a second layer having a light transmissivity of more than 50% to the second wavelength light, and separated from the conversion layer by a second boundary being longer than the first boundary.
A layer structure, comprising:
- a conversion layer adapted to absorb a first wavelength light and emit a second wavelength light;
- a first layer having a light reflectivity of more than 50% to the second wavelength light, and contacting the conversion layer with a first boundary;
- a second layer having a light transmissivity of more than 50% to the second wavelength light, and contacting the conversion layer with a second boundary being longer than the first boundary.
A layer structure, comprising:
- a conversion layer adapted to emit a converted light and an unabsorbed light;
- a first layer having an average reflectivity of above 90% to a visible light, and separated from the conversion layer by a first boundary;
- a second layer separated from the conversion layer by a second boundary being longer than the first boundary.
Dependencies are inferred from the claim text.