Figure 3

PL spectra of the compensated GaN epilayers irradiated with a dose 1x 10 ¹⁸ cm^-2. Spectra were measured using above band gap excitation of the 351 nm line from an Ar⁺ laser (red curve) and below band gap excitation of 780 nm (blue curve) from a tunable Ti-sapphire laser, respectively.

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