Highly Bright and Stable Chiral CsPbBr₃ Perovskite Nanocrystal Scintillators for High-Resolution X-ray Imaging

Chiral perovskite nanocrystals (PeNCs) scintillators hold great potential for reducing optical crosstalk in X-ray imaging, due to their circularly polarized radioluminescence (CPRL) properties. However, due to the weak binding of chiral ligands and inefficient chirality transfer, achieving chiral PeNCs with high radioluminescence dissymmetry factors (gRL) remains a challenge. Here, we introduce polydimethylsiloxane (PDMS) as a CPRL-enhancing modifier that anchors chiral ligands to PeNCs surfaces through σ-π interactions. As a result, these chiral PeNCs exhibit a high gRL of 3.13 × 10-2, together with a near-unity photoluminescence quantum yield and a large asymmetry factor (glum) of 3.10 × 10-2, representing the highest chiral optical performance reported for chiral scintillators. We then, for the first time, demonstrate that these high-performance chiral PeNCs film can effectively suppress optical crosstalk to enhance X-ray imaging quality, opening a new avenue for designing advanced chiral PeNCs with significantly broadened practical applicability.