Wavelength converters, including polarization-enhanced carrier capture converters, for solid state lighting devices, and associated systems and methods

A method for forming a solid state lighting device, comprising:

• selecting a radiative structure having a first region and a second region, the first region having a first non-zero value of a material characteristic, the second region having a second non-zero value of the material characteristic, with the first and second values producing a potential gradient to drive at least one of electrons and holes in the radiative structure from the first region to the second region;
• and
• positioning the radiative structure with the first region proximate to a radiation source to absorb radiation at a first wavelength, and with the second region positioned to receive energy from the first region and emit the energy at a second wavelength via radiative recombination, wherein the second wavelength is different than the first wavelength,
• wherein the material characteristic includes material polarization, and wherein selecting a radiative structure includes selecting a radiative structure with the first region having a first material polarization value and the second region having a second material polarization value different than the first material polarization value, with the differences between the first and second material polarization values forming an electric field at an interface between the first and second regions.