Solid-state transducer devices with selective wavelength reflectors and associated systems and methods

A solid-state transducer (SST) device, comprising:

• a first emitter configured to emit first emission having a first wavelength;
• a second emitter configured to emit second emission having a second wavelength different from the first wavelength;
• and
• a selective wavelength reflector having a front surface facing a front side of the SST device from which the first and second emissions exit the SST device, and a back surface facing a back side of the SST device opposite to the front side, the first emitter being at the back surface and the second emitter being at the front surface, wherein:
• the selective wavelength reflector is configured to at least substantially transmit the first emission and at least substantially reflect the second emission;
• 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 first emitter is an SST structure configured to emit blue light;
• wherein the second emitter is a first converter material configured to emit red light;
• wherein the selective wavelength reflector is a first selective wavelength reflector configured to at least substantially transmit the blue light and at least substantially reflect the red light and green light toward the front side of the SST device;
• and
• wherein the SST device further comprises:
• a second converter material proximate the front side of the SST device with respect to the first converter material, the second converter material being configured to emit the green light;
• and
• a second selective wavelength reflector between the first and second converter materials, wherein the second selective wavelength reflector is configured to at least substantially transmit the blue and red light and at least substantially reflect the green light toward the front side of the SST device.

A solid-state transducer (SST) device, comprising:

• an SST structure configured to emit first emission having a first wavelength;
• a converter material structure configured to emit second emission having a second wavelength different from the first wavelength;
• and
• a selective wavelength reflector between the SST structure and the converter material structure, wherein:
• the selective wavelength reflector has a refractive index configured to at least substantially reflect the second emission and at least substantially limit reflection of the first emission;
• 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 SST device has a front side from which the first and second emissions exit the SST device and a back side facing away from the front side;
• the converter material structure comprises a plurality of converter materials proximate the front side of the SST device with respect to the SST structure, the converter materials of the plurality being configured to emit emission with successively shorter wavelengths as the converter materials of the plurality are positioned closer to the front side of the SST device;
• the selective wavelength reflector is a first selective wavelength reflector;
• and
• the SST device further comprises:
• a plurality of second selective wavelength reflectors between adjacent converter materials of the plurality, each second selective wavelength reflector having a second refractive index configured to at least substantially reflect emission of the overlying converter material(s) and at least substantially limit reflection of emission of the underlying converter material(s).

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).

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 LED structure is configured to emit blue light;
• wherein the emitter is a first converter material configured to emit red light;
• wherein the selective wavelength reflector is a first selective wavelength reflector configured to at least substantially transmit the blue light and at least substantially reflect the red light and green light toward the front side of the LED device;
• and
• wherein the LED device further comprises:
• a second converter material proximate the front side of the LED device with respect to the first converter material, the second converter material being configured to emit the green light;
• and
• a second selective wavelength reflector between the first and second converter materials, wherein the second selective wavelength reflector is configured to at least substantially transmit the blue and red light and at least substantially reflect the green light toward the front side of the LED device.