Photochromic contrast optimization based on hafmium-based ceramics for optical information storage: Component adjustment and ion-doping

Herein, we report strategies combining component adjustment and ion doping for the development of photochromic materials with high color-changing contrast. Sr0.05Ba0.95HfO3: Eu3+ ceramics showed reversible photochromism from off-white to dark brown under the alternating action of 254 nm UV light and heat treatment at 300 °C. This is caused by the capture and release of electrons by defects in the Sr0.05Ba0.95HfO3: Eu3+ host such as oxygen vacancies. Under this strategy, the maximum photochromic contrast ratio of 44.81% is achieved, which is a great improvement compared to pure SrHfO3 (15.91%) and BaHfO3 (14.98%). The luminescence quenching behavior based on the photochromic reaction can effectively modulate the emission of Eu3+. The reversible photochromic properties of Sr0.05Ba0.95HfO3: Eu3+ ceramics can be used for repeated writing and erasing of optical information, and the significant body color change improves its resolution in pattern information storage.