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 photo -chromic 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 degrees 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 infor-mation storage.