Patent ID: 11908978
Assignee: MICRON TECHNOLOGY, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. A light emitting diode (LED) device, comprising:
an LED structure configured to emit first light having a first wavelength;
an emitter configured to emit second light having a second wavelength different from the first wavelength; and
a selective wavelength reflector having a front surface facing a front side of the LED device from which the first and second light exit the LED device, and a back surface facing a back side of the LED device opposite to the front side, the LED structure being at the back surface and the emitter being at the front surface, wherein:
the selective wavelength reflector is configured to at least substantially transmit the first light and at least substantially reflect the second light; and
the selective wavelength reflector includes a multilayer stack of materials comprising layers of silicon dioxide (SiO2), titanium dioxide (TiO2), and alloys thereof, two TiO2 layers of the multilayer stack being separated by a SiO2 layer and at least one alloy layer,

wherein the emitter comprises a plurality of converter materials proximate the front side of the LED device with respect to the LED structure, the converter materials of the plurality being configured to emit light having successively shorter wavelengths as the converter materials of the plurality are positioned closer to the front side of the LED device;
wherein the selective wavelength reflector is a first selective wavelength reflector; and
wherein the LED device further comprises a plurality of second selective wavelength reflectors between adjacent converter materials of the plurality, each second selective wavelength reflector having a refractive index configured to at least substantially reflect light emitted by the overlying converter material(s) and at least substantially limit reflection of light emitted by the underlying converter material(s).