The high-temperature annealing effect of a V2O5/Al2O3 bilayer on the reflectivity visible band was studied in present work. It found that V2O5 (200 nm)/Al2O3 (30 nm) sample (A-0) has nano-granular surface morphology without definite crystalline phase. reflectance A-0 overreaches 60% as wavelength is larger than 650 nm, and its minimum (20%) occurs at ~500 nm. After situ treatment 750 °C for 30 ...