Speaker
Description
Ultrafast scintillators are critically demanded in a wide range of advanced radiation detection scenarios, including high-speed X-ray imaging, positron emission tomography (PET), time-of-flight (TOF)–based neutron and gamma-ray discrimination, and timing diagnostics at synchrotron radiation facilities. However, the scintillation response of conventional materials is fundamentally constrained by ion-doped luminescence mechanisms, which rely on intrinsically slow electronic transitions.
In contrast, we have proposed and experimentally demonstrated an exciton-based scintillation paradigm, in which radiative recombination originates from electronically excited states with intrinsically ultrafast dynamics. By exploiting diverse excitonic species—including self-trapped excitons in copper halides, hot-exciton emission in organic scintillators, and strongly confined free excitons in two-dimensional perovskites—we establish a new family of scintillators that simultaneously achieve ultrafast response, high light yield, and excellent radiation sensitivity.
In this talk, I will present a comprehensive discussion spanning excited-state mechanism characterization, crystal growth and materials engineering, and application-oriented detector and device design. These results highlight the central role of exciton dynamics in breaking the conventional speed limits of scintillation and open new opportunities for next-generation high-spatiotemporal-resolution radiation detection systems.
| Track | FTMI |
|---|---|
| Presentation type | Oral |