Solid-state radiation transducer devices having at least partially transparent buried-contact elements, and associated systems and methods

A light-emitting diode device, comprising:

• a light-emitting diode including—
• a first semiconductor material,
• a second semiconductor material, and
• an active region between the first semiconductor material and the second semiconductor material;
• a first contact electrically coupled to the first semiconductor material;
• a second contact including a buried-contact element electrically coupled to the second semiconductor material, wherein the buried-contact element has an end portion directly adjacent to the second semiconductor material, and wherein the end portion of the buried-contact element is transparent;
• and
• an optical component including—
• a transparent matrix, and
• color-converting particles within the matrix, wherein the color-converting particles are configured to absorb radiation from the light-emitting diode at a first wavelength range and to emit radiation at a second wavelength range different than the first wavelength range, wherein radiation emitted by the color-converting particles includes backscatter radiation, and wherein an average reflectivity of backscatter radiation from the color-converting particles at the buried-contact element is greater than 75%.