Yb 3+ -doped CsPbCl 3 Scintillator Used in Portable X-ray Imaging and Near-infrared Phosphor-converted Light-emitting Diode

Abstract

Traditional X-ray imaging systems rely on scintillators and play a critical role in medical diagnosis and security inspection.However, their bulky size and complicated structure severely restrict their applications in portable and lightweight scenarios. Near-infrared (NIR) luminescent materials possess distinctive optical advantages, such as low propagation loss in biological tissues and immunity to visible-light interference, exhibiting great potential in bioimaging and non-destructive testing.Perovskites show outstanding and tunable luminescence, and Yb 3+ doping can effectively modulate their emission into the NIR region and alleviate self-absorption. This work systematically explored the crystal structure, optical properties, and Xray imaging performance of 5% Yb 3+ -doped CsPbCl3 flexible films, together with their application in NIR phosphor-converted light-emitting diode (pc-LED). Results reveal that 5% Yb 3+ doping maintains lattice integrity and homogeneous element distribution. The film emits intense NIR light at 985 nm under 420 nm excitation, with an X-ray detection limit of 2.2 μGyairs - 1 and spatial resolution of 9 lp•mm -1 , enabling clear imaging of capsule internal structures. The as-fabricated NIR pc-LEDs present excellent luminescence and clear palm vein imaging. This study offers a promising material strategy for portable low-dose X-ray imaging and experimental support for rare-earth-doped perovskite NIR light sources.