Fig. 1. SEM images of three NWs samples. (a) Undoped nanowires; (b) Si-doped nanowires; (c) Zn-doped nanowires

Fig. 2. 20 K low-temperature PL spectrum of three nanowires samples

Fig. 3. 20 K low-temperature variable power density PL spectra of three nanowires samples along with their fitting lines. (a) Variable power density PL spectra of Zn-doped nanowires and the relationship between integrated intensity and power density; (b) Relationship between peak position and P^1/3 of variable power density PL spectra of Zn-doped nanowires and its fitting lines; (c) Variable power density PL spectra of undoped nanowires and the relationship between integrated intensity and power density; (d) Variable power density PL spectra of Si-doped nanowires and the relationship between integrated intensity and power density

Fig. 4. Variable temperature PL spectrum of undoped, Si-doped nanowires along with their fitting lines. (a) Variable temperature PL spectra of undoped nanowires and relationship between peak position and temperature along with fitting line; (b) Variable temperature PL spectra of Si-doped nanowires and relationship between peak position and temperature along with fitting line

Fig. 5. TEM images and SEAD patterns of Zn-doped nanowire samples. (a) TEM image of Zn-doped nanowires; (b) HRTEM image of Zn-doped nanowires; (c) SEAD image of Zn-doped nanowires