White LED light source and method of making same
A light source that includes an LED light source, and one or more encapsulants containing a light-absorbing component that absorbs light in the wavelength range of about 415 nm to about 435 nm and can include at least one phosphor that can provide an LED light source that emits white light having a reduced amount of blue light or even toxic blue light with minimal effect on color characteristics such as correlated color temperature (CCT), color gamut, and luminance.
1. An LED light source comprising:
an LED;
an encapsulant disposed upon the LED,
wherein the encapsulant comprises a light-absorbing component absorbing light from about 415 nm to about 455 nm, the light-absorbing component being dispersed within the encapsulant, wherein the light-absorbing component comprises a dye, an organic pigment, or an inorganic pigment; and
at least a first phosphor that absorbs light at a blue wavelength, the first phosphor being dispersed within the encapsulant,
wherein the first phosphor reemits light at a first higher wavelength than the blue wavelength that it absorbs light.
2. An LED light source according to claim 1 , wherein the encapsulant further comprises a second phosphor that absorbs blue light, the second phosphor being dispersed within the encapsulant, and
wherein the second phosphor reemits light at a second higher wavelength different from the first higher wavelength.
3. The LED light source according to claim 2 , the LED light source has a percent reduction in blue light hazard from about 15 to about 75.
4. The LED light source of claim 2 , wherein the first phosphor converts blue light into green light, and the second phosphor converts blue light into yellow light.
5. An LED light source according to claim 1 , wherein the light-absorbing component comprises a dye or a pigment.
6. The LED light source according to claim 5 , wherein the light-absorbing component comprises an organic pigment.
7. An LED light source according to claim 5 , wherein the light-absorbing component comprises an inorganic pigment.
8. An LED light source according to claim 1 , wherein the light-absorbing component comprises a dye have an absorbance maximum of from about 425 to about 435 nm.
9. An LED light source according to claim 1 , wherein the light-absorbing component comprises a dye have an absorbance maximum of from about 430 to about 435 nm.
10. The LED light source according to claim 1 , the LED light source has a percent reduction in blue light hazard from about 15 to about 75.
11. The LED light source of claim 1 , wherein the LED comprises an organic light-emitting diode.
12. The LED light source of claim 1 , wherein the encapsulant comprises a silicon-containing polymer.