Fig. 4: AIMD and light transmission mechanism diagram for glassy and polycrystalline state scintillation screens.
a Molecular structures of single crystal, molten state, polycrystalline state, and glassy state. Due to the time scale limitation of AIMD simulation, a much higher melting temperature of 1600 K is chosen to simulate the molten state of transparent media. b The RDF of GMn-P(r) for Mn-P distance. c GP-P(r) for P-P distance. The degree of dispersion is related to the molecular state. d The MSD (all elements, element P and Mn) vs. simulation time during the quenching process. e Schematic diagram of light transmission for transparent glassy and opaque polycrystalline scintillation screens (The enlarged part is a schematic diagram of molecular arrangement. The dashed color blocks in the right figure represent different crystal planes and grain boundaries.). In the transparent scintillation screen: the homogeneous disordered glassy state of the transparent medium allows emitted light to propagate straightly without scattering, resulting in the sharp image. In the case of polycrystalline scintillation screen: the light undergoes numerous refractions because it meets a great amount of crystal planes, resulting in the blurred luminescence that seriously impacts the image sharpness.
