US Patent No. 9,719,660

COMPOSITIONS FOR LED LIGHT CONVERSIONS


Patent No. 9,719,660
Issue Date August 01, 2017
Title Compositions For Led Light Conversions
Inventorship Raghuram L. V. Petluri, Los Angeles, CA (US)
Paul Kenneth Pickard, Los Angeles, CA (US)
Assignee EcoSense Lighting Inc., Los Angeles, CA (US)

Claim of US Patent No. 9,719,660

1. A method of generating white light, the method comprising:
passing light from a first LED string through a first luminophoric medium comprised of one or more luminescent materials and
matrix in a first ratio for a first combined light in a blue color range on 1931 CIE diagram;

passing light from a second LED string through a second luminophoric medium comprised of one or more luminescent materials
and matrix in a second ratio for a second combined light in a red color range on 1931 CIE diagram;

passing light from a third LED string through a third luminophoric medium comprised of one or more luminescent materials and
matrix in a third ratio for a third combined light in a yellow/green color range on 1931 CIE diagram;

passing light from a fourth LED string through a fourth luminophoric medium comprised of one or more luminescent materials
and matrix in a fourth ratio for a fourth combined light in a cyan color range on 1931 CIE diagram;

mixing the first, second, third, and fourth combined light together;
wherein the first, second, and third LED strings each comprise an LED with peak wavelength of between about 385 nm and about
470 nm;

wherein the fourth LED string comprises an LED with a peak wavelength of between about 485 nm and about 520 nm;
wherein the luminescent materials within each of the first, second, third, and fourth luminophoric mediums comprise:
one or more of a first type of luminescent material that emits light at a peak emission between about 515 nm and 590 nm in
response to the associated LED string emission, and

one or more of a second type of luminescent material that emits light at a peak emission between about 590 nm and about 700
nm in response to the associated LED string emission;

wherein the one or more of the first type of luminescent materials comprise BaMgAl10O17:Eu, Lu3Al5O12:Ce, (La,Y)3Si6N1:Ce, or Y3Al5O12:Ce,

wherein the one or more of the second type of luminescent materials comprise CaAlSiN3:Eu, (Sr,Ca)AlSiN3, or a semiconductor quantum dot; and,

wherein the third luminophoric medium comprises up to about 99% by volume of Lu3Al5O12:Ce.