LED-based light sources for light emitting devices and lighting arrangements with photoluminescence wavelength conversion
First Claim
1. A lighting arrangement comprising:
- a first excitation source that generates excitation light having a first dominant wavelength in a range 450 nm to 480 nm;
a second excitation source that generates excitation light having a second dominant wavelength in a range 450 nm to 480 nm, wherein the first dominant wavelength is different from the second dominant wavelength by at least 2.5 nm; and
a photoluminescence material that converts at least a portion of the excitation light to light of a different wavelength;
wherein the emission product of the arrangement comprises a combination of the excitation light generated by the first and second excitation sources and light generated by the at least one photoluminescence material.
0 Assignments
0 Petitions
Accused Products
Abstract
An LED-based light source for generating light having a selected dominant wavelength λds comprises a package housing a plurality of LEDs consisting of LEDs from first and second wavelength bins. The first wavelength bin comprises LEDs having a dominant wavelength λd1 that is within a first wavelength range and the second wavelength bin comprises LEDs having a dominant wavelength λd2 that is within a second wavelength range. The first wavelength bin can comprise LEDs having a dominant wavelength that is shorter than the selected dominant wavelength while the second wavelength bin comprises LEDs having a dominant wavelength that is longer than the selected dominant wavelength. The wavelength bins and number of LEDs are selected such that in operation the dominant wavelength of the combined light emitted by the source is the selected dominant wavelength. Lighting arrangements and light emitting devices incorporating such light sources are disclosed.
-
Citations
18 Claims
-
1. A lighting arrangement comprising:
-
a first excitation source that generates excitation light having a first dominant wavelength in a range 450 nm to 480 nm; a second excitation source that generates excitation light having a second dominant wavelength in a range 450 nm to 480 nm, wherein the first dominant wavelength is different from the second dominant wavelength by at least 2.5 nm; and a photoluminescence material that converts at least a portion of the excitation light to light of a different wavelength; wherein the emission product of the arrangement comprises a combination of the excitation light generated by the first and second excitation sources and light generated by the at least one photoluminescence material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
Specification