Mn²⁺‐Activated Cs₃Cu₂I₅ Nano‐Scintillators for Ultra‐High Resolution Flexible X‐Ray Imaging

Abstract

Zero‐dimensional (0D) copper‐based perovskite‐derivative nano‐scintillators (NSs), as a promising non‐toxic alternative to lead‐based halide perovskite, have shown great potential in flexible X‐ray detection and imaging. However, their practical applications are still impeded by low X‐ray imaging resolution associated with inadequate radioluminescence (RL) and poor environmental stability. Herein, for the first time a simple but valid Mn2+‐activation strategy is proposed to highly enhance the RL and stability of 0D Cs3Cu2I5 NSs, where the Mn2+ ions are embedded into the highly localized [Cu2I5]3− units by utilizing a modified hot‐injection method. As such, a newly emerged emission band of Mn2+ ion centered at ≈562 nm coupled with much improved intrinsic self‐trapped excitons (STE) emission of the 0D Cs3Cu2I5 host peaking at ≈445 nm can be achieved in these resultant Mn2+‐activated 0D Cs3Cu2I5 NSs, thereby delivering a light yield of 71 000 photons MeV−1 that is much superior to their lead‐based perovskite counterparts and commercial scintillators. As a consequence, X‐ray detectors made of these Mn2+‐activated NSs implement an ultrahigh X‐ray imaging resolution of 16.2 line pairs mm−1 and an ultra‐low detection limit of 127.5 nGyair s−1, highlighting their potential as promising candidates for flexible X‐ray detection and imaging.

Yellow Emissive CsCu2I3 Nanocrystals Induced by Mn2+ for High-Resolution X-ray Imaging

“…To evaluate the imaging quality, we investigated the spatial resolution of the scintillator film by obtaining an X-ray image of a standard X-ray test-pattern plate. The CsCu 2 I 3 NCs scintillator film displayed a spatial resolution of 16.6 lp mm −1 (Figure 4c), which exceeds most commercial inorganic scintillators and the reported lead-based perovskite scintillators, 52 demonstrating the great potential of the CsCu 2 3 NCs for high-resolution X-ray imaging. Figure 4d exhibits the X-ray image of an SD card obtained from the homemade imaging system.…”

Highly efficient and ultra-stable CsPbBr3 composites for LCD devices and X-ray imaging

“…6e, even after exposure to such a high fluence and large dose of X-ray irradiation, the CsPbBr 3 -DPSI/MS composites still retain 90% of their initial RL intensity, which is comparable to other perovskites or perovskite-like metal halide scintillators with outstanding stability, such as CsPbBr 3 @PbBrOH (keep stable under the X-ray irradiation with a total dose of 0.338 Gy) and Cs 3 Cu 2 I 5 (following exposure to X-ray irradiation at a rate of 17.4 mGy air s À1 and a cumulative dose of 43 Gy, the RL intensity retains 78% of its initial value). 47,48 The X-ray imaging system based on the CsPbBr 3 -DPSI/MS composite film achieves a spatial resolution of E16 lp mm À1 , as obtained from an X-ray image of a standard X-ray test pattern plate (Fig. 6f), which is even superior to most perovskite-based X-ray imaging systems (Table S5, ESI †).…”

Red-emitting Cs2NaScCl6:Sm flexible films for high-resolution X-ray imaging

“…29) and CsPbBr 3 QDs. 30 In evaluating the X-ray detection capability of the Cs 2 -NaScCl 6 :7%Sm perovskite crystals, their radioluminescence intensity at different dose rates was measured in a darkroom environment. That is, under 50 kV, the luminescence intensity under a continuous test tube current of 100, 90, 80, 70, 60, 50, 40, 30, 20, 10, 9, 8, 7, 6, 5, 4, 3, 2, and 1 μA is shown in Fig.…”