Structural and Optical Properties of Compositionally Disordered Perovskite Metal Oxide Films

Perovskite metal oxides offer a wide range of functionalities owing to their rich compositional diversity. Experimental results have shown that much-enhanced physical properties could be achieved by forming multicomponent or high-entropy perovskite oxides. In this talk, we discuss our efforts in the design and synthesis of compositionally disordered epitaxial perovskite metal oxide films with multiple A-site cations. Using rare-earth aluminum perovskite oxide with an equiatomic ratio (La_0.2Lu_0.2Y_0.2Gd_0.2Ce_0.2)AlO₃ as the model system, we show that a high entropy oxide system with equiatomic A-site cations allows for the achievement of desired optical luminescence observed in mixtures and/or doping of RE aluminates while maintaining a highly crystalline single-phase. The high crystallinity of these materials paves the way for exciting new research of high precision scintillating applications.