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.