Green emission of indium oxide via hydrogen treatment

In this work, we prepared hydrogen treated indium oxide (H₂-In₂O₃) and investigated the effect of hydrogen treatment on the optical and photoluminescence properties of In₂O₃. Hydrogen treatment has no influence on the crystal structure, but alters the intrinsic electronic structure and optical properties via introducing hydrogen induced defects such as shallow donor states (near the conduction band) and singly ionized oxygen vacancies in H₂-In₂O₃. Both air-In₂O₃ (air calcinated) and H₂-In₂O₃ show intense blue emission under UV excitation (280 nm). However, hydrogen treated In₂O₃ exhibited an additional green emission, which is absent in air-In₂O₃. This green emission arises from the passivation of singly ionized oxygen vacancies by hydrogen treatment. Hydrogen treatment could be a promising strategy to tune the electronic and optical properties of In₂O₃.