Medical x‐ray imaging in infrared to visible upconverting materials

In some crystalline and glass ceramic IR upconverting materials, the visible light intensity resulting from the IR excitation can be reduced by a prior x‐ray exposure. Such behavior is studied for medical x‐ray imaging applications. A model is developed to describe the interactions between the microscopic defects responsible for the quenching of the visible emission and the luminescent ions. At last, a radiograph of a tooth is obtained by using such upconverting materials.