We study the optical spectral properties for green semipolar (202̄1̄) and (202̄1) light-emitting diode (LED) with same indium compositions. Compared to (202̄1) devices, the fabricated (202̄1̄) micro-LED (∼0.005mm2) showed negligible blue shift and smaller full width at half maximum (FWHM) up to extremely high current densities (10,000 A/cm2). Theoretical simulation indicates that the (202̄1̄) InGaN quantum well (QW) has reduced polarization-related effects due to combined effects of electric field cancelling and Coulomb screening effect. In addition, the packaged device performance for small-area (∼0.144mm2) semipolar green (202̄1̄) and (202̄1) LEDs were also discussed. The green (202̄1̄) LED showed smaller wavelength shift and narrower FWHM than green LEDs fabricated on other planes.
ASJC Scopus subject areas
- Physics and Astronomy(all)