Wavelength converted light emitting device
AssigneeKoninklijke Philips N.V.
InventorsGerd Mueller, Regina Mueller-Mach, Peter Josef Schmidt, Danielle Russel Chamberlin, Oleg Borisovich Shchekin, Hans-Helmut Bechtel
Life of this patent
Estimating the term…
Abstract
In a method according to embodiments of the invention, for a predetermined amount of light produced by a light emitting diode and converted by a phosphor layer comprising a host material and a dopant, and for a predetermined maximum reduction in efficiency of the phosphor at increasing excitation density, a maximum dopant concentration of the phosphor layer is selected.
Claims18
A method comprising, for a predetermined amount of light produced by a light emitting diode and converted by a phosphor layer comprising a host material and a dopant, and for a predetermined maximum reduction in efficiency of the phosphor layer at increasing excitation density, selecting a maximum dopant concentration of the phosphor layer.
A structure comprising:
- a light emitting diode emitting light having a first peak wavelength;
- and
- a phosphor disposed in a path of light emitted by the light emitting diode, the phosphor for absorbing light emitted by the light emitting diode and emitting light having a second peak wavelength;
- wherein:
- the phosphor comprises a host material and a dopant;
- and
- a concentration of the dopant and arrangement of the dopant are selected such that at a predetermined light emission from the light emitting diode, a predetermined maximum reduction of the phosphor's efficiency is not surpassed.
A structure comprising:
- a light emitting diode emitting light having a first peak wavelength;
- a phosphor disposed in a path of light emitted by the light emitting diode, the phosphor for absorbing light emitted by the light emitting diode and emitting light having a second peak wavelength;
- and
- a non-wavelength converting material disposed between the light emitting diode and the phosphor, wherein the non-wavelength converting material is selected to reduce an amount of light reaching the phosphor from the light emitting diode, such that a predetermined maximum reduction of the phosphor's efficiency is not surpassed.
(canceled)
(canceled)
(canceled)
Dependencies are inferred from the claim text.