US Patent No. 10,205,067

LED WITH CERAMIC GREEN PHOSPHOR AND PROTECTED RED PHOSPHOR LAYER


Patent No. 10,205,067
Issue Date February 12, 2019
Title Led With Ceramic Green Phosphor And Protected Red Phosphor Layer
Inventorship April Dawn Schricker, Palo Alto, CA (US)
Kim Kevin Mai, San Jose, CA (US)
Grigoriy Basin, San Francisco, CA (US)
Uwe Mackens, Aachen (DE)
Joost Peter Andre Vogels, Leende (NL)
Aldegonda Lucia Weijers, Eindhoven (NL)
Karl Adriaan Zijtveld, Aachen (DE)
Assignee Lumileds LLC, San Jose, CA (US)

Claim of US Patent No. 10,205,067

1. A light emitting device comprising:a substrate, the substrate having a first surface and a second surface opposite the first surface, the first surface forming a first outer surface of the light emitting device:
a light emitting element configured to emit light having a first wavelength, the light emitting element being disposed adjacent the second surface of the substrate;
a ceramic wavelength conversion element formed from a first wavelength conversion material that converts light incident thereon from the light emitting element to light having a second wavelength different from the first wavelength, the ceramic wavelength conversion element having a first surface adjacent the light emitting element and a second surface opposite the first surface;
a layer of adhesive material disposed between the light emitting element and the first surface of the ceramic wavelength conversion element;
a coating of a second wavelength conversion material disposed on the second surface of the ceramic wavelength conversion element, the second wavelength conversion material converting light incident thereon to light having a third wavelength different from the first wavelength and the second wavelength and having a first surface adjacent the ceramic wavelength conversion element and a second surface opposite the first surface; and
a continuous layer of sacrificial material having a first surface, a second surface opposite the first surface, and a plurality of side surfaces, the first surface of the sacrificial material forming a second outer surface of the light emitting device, the second surface of the sacrificial material being disposed in direct contact with the second surface of the coating of the second wavelength conversion material, and the sacrificial material being transparent to light having the first, second and third wavelengths.