Optical polarization properties of (11-22) semi-polar InGaN LEDs with a wide spectral range.

ABSTRACT: Electroluminescence polarization measurements have been performed on a series of semi-polar InGaN light emitting diodes (LEDs) grown on semi-polar (11-22) templates with a high crystal quality. The emission wavelengths of these LEDs cover a wide spectral region from 443 to 555 nm. A systematic study has been carried out in order to investigate the influence of both indium content and injection current on polarization properties, where a clear polarization switching at approximately 470 nm has been observed. The shortest wavelength LED (443 nm) exhibits a positive 0.15 polarization degree, while the longest wavelength LED (555 nm) shows a negative -0.33 polarization degree. All the longer wavelength LEDs with an emission wavelength above 470 nm exhibit negative polarization degrees, and the

SUBMITTER: Poyiatzis N 

PROVIDER: S-EPMC7188879 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature