Light source with wavelength converting material
AssigneeAvago Technologies General IP Pte Ltd
InventorsKee Ng, Kheng Tan, Tajul Baroky, Janet Chua, Kok Pan
Life of this patent
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Abstract
A light emitting device in which a primary light generator, such as a light emitting diode (LED) or laser diode, is operable to emit a primary light that is received by a body of wavelength converting material. A portion of the primary light is absorbed by the body of wavelength converting material and is emitted as secondary light. The wavelength converting material contains phosphor nano-particles and larger phosphor particles. The phosphor nano-particles prevent transmission of primary light while the larger phosphor particles provide efficient light conversion.
Claims23
A light emitting device comprising:
- a) a primary light generator operable to emit a primary light;
- and
- b) a body of wavelength converting material located to receive at least a portion of the primary light and emit a secondary light in response;
- wherein the body of wavelength converting material comprises phosphor nano-particles and larger phosphor particles.
A method for generating visible light, comprising:
- a) generating primary light using a primary light generator;
- b) receiving the primary light with a body of wavelength converting material;
- c) absorbing a first portion of the primary light by a plurality of phosphor particles in the body of wavelength converting material and emitting secondary light of a first wavelength;
- and
- d) absorbing a second portion of the primary light by a plurality of phosphor nano-particles in the body of wavelength converting material and emitting secondary light of a second wavelength,
- wherein the secondary light of the first wavelength and the secondary light of the second wavelength combine to form the visible light.
A method for generating visible light, comprising:
- a) generating primary light using a primary light generator;
- b) receiving the primary light with a first body of wavelength converting material;
- c) absorbing a first portion of the primary light by a plurality of phosphor particles in the first body of wavelength converting material and emitting secondary light while transmitting a second portion of the primary light;
- d) receiving the secondary light and the second portion of the primary light with a second body of wavelength converting material;
- e) absorbing the second portion of the primary light by a plurality of phosphor nano-particles in the second body of wavelength converting material and emitting tertiary light;
- and
- f) transmitting the secondary light through the second body of wavelength converting material;
- wherein the secondary light and the tertiary light combine to form the visible light.
A method for generating visible light, comprising:
- a) generating primary light using a primary light generator;
- b) receiving the primary light with a first body of wavelength converting material;
- c) absorbing a first portion of the primary light by a plurality of phosphor particles in the first body of wavelength converting material and emitting secondary light while transmitting a second portion of the primary light;
- d) receiving the secondary light and the second portion of the primary light with a second body of wavelength converting material;
- and
- e) absorbing the second portion of the primary light by a plurality of phosphor nano-particles in the second body of wavelength converting material and emitting the visible light.
Dependencies are inferred from the claim text.