LED white light source with broadband excitation
First Claim
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1. A white light source, comprising:
- a semiconductor light emitting diode (LED) having a light exit side and a main radiating direction, said semiconductor LED emitting a light; and
an encapsulation at least partly surrounding said semiconductor LED and made of a transparent material containing a converter substance for at least partial wavelength conversion of the light emitted by said semiconductor LED;
said semiconductor LED having at least two light-emitting zones embodied such that a maxima of their emission spectra are energetically detuned relative to one another and lie above an emission spectrum of said converter substance, said light-emitting zones disposed one behind another in said main radiating direction of said semiconductor LED such that an energy of an emission maximum increases in a direction of said light exit side of said semiconductor LED.
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Abstract
A white light source is described and has a UV-/blue-emitting semiconductor LED and an embedding compound provided with phosphor particles. The LED is provided with a plurality of light-emitting zones that are applied within a layer structure on a common substrate. An emission maxima of the light-emitting zones are energetically detuned relative to one another by different choice of the composition or of the layer thickness of the semiconductor material.
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Citations
11 Claims
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1. A white light source, comprising:
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a semiconductor light emitting diode (LED) having a light exit side and a main radiating direction, said semiconductor LED emitting a light; and
an encapsulation at least partly surrounding said semiconductor LED and made of a transparent material containing a converter substance for at least partial wavelength conversion of the light emitted by said semiconductor LED;
said semiconductor LED having at least two light-emitting zones embodied such that a maxima of their emission spectra are energetically detuned relative to one another and lie above an emission spectrum of said converter substance, said light-emitting zones disposed one behind another in said main radiating direction of said semiconductor LED such that an energy of an emission maximum increases in a direction of said light exit side of said semiconductor LED. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification