Lead-free organic-inorganic hybrid scintillators for X-ray detection

Abstract

Scintillators, which can convert high-energy particles (X-rays) into detectable lowenergy ultraviolet-visible-near-infrared photons, are essential components of X-ray detectors and show extensive practical applications in nondestructive detection and medical imaging. Traditionally, inorganic scintillators represented by CsI:Tl have achieved definite progress. However, the harsh preparation conditions, high production cost, and poor mechanical properties impede their potential development in the high-end X-ray imaging field. Organic-inorganic hybrid metal complexes could be excellent alternatives, by virtue of their structural and spectral tunability, good solution processability, and excellent photophysical properties. This review mainly focuses on eco-friendly lead-free metal (Mn₂₊, Cu₊, Sb₃₊, Sn₂₊, Ge₂₊, Ln₃₊, etc.) complex scintillators. The luminescence mechanisms are introduced and the scintillation performance, such as light yield, limit of detection, imaging resolution, etc., is highlighted. Moreover, the current challenges and perspectives in this emerging field are described. It is hoped to provide some theoretical guidance for the continuous development of the new scintillator systems.

Keywords

luminescence mechanisms / organic-inorganic hybrid metal complexes / scintillation performance / scintillators / X-ray detection and imaging

RIGHTS & PERMISSIONS

2023 The Authors. Aggregate published by South China University of Technology; AIE Institute and John Wiley & Sons Australia, Ltd.