Figure 3

Dependence of PL quantum efficiency on the excitation intensity for PL bands in GaN. Sample H3 at 100 K. The lines are calculated using Eq. (3) with the following parameters: \(\alpha =1.2\times {10}^{5}\) cm⁻¹, τ = 15 µs, \({\eta }_{0}=8\times {10}^{-4}\), and \(N=7\times {10}^{12}\) cm⁻³ for the UVL band, \(\tau =450\) µs, \({\eta }_{0}=9\times {10}^{-3}\), and \(N=2.4\times {10}^{14}\) cm⁻³ for the YL1 band, and τ = 1000 µs, \({\eta }_{0}=1.3\times {10}^{-2}\), and N = 2.4 × 10¹⁴ cm⁻³ for the RL1 band.