Temperature-dependent PL spectra of the Sb-doped ZnO microrod array. From top to bottom: T = 30, 45, 60, 75, 90, 105, 120, 135, 150, 180, 210, 240, 270, and 300 K, respectively. The peaks centered at around 2.8 eV are laser background signals. The inset shows the PL peak positions in energy as a function of temperature of the Sb-doped ZnO microrod array. The squares are experimental data of the FA emission, and the red line is the fitting curve to the Varshni equation.