Figure 6

(a) PL spectra at polarizations parallel or perpendicular to the [1–100] axis on (11–22) GaN at room temperature. (b) PL spectra of (11–22) GaN at different polarization angles (θ) at room temperature. (c)Variation of normalized PL intensity and PL peak energy of (11–22) GaN with polarization angle θ at room temperature.