Reproducible X‐ray Imaging with a Perovskite Nanocrystal Scintillator Embedded in a Transparent Amorphous Network Structure

Zhang, Hao; Yang, Ze; Zhou, Min; Zhao, Lei; Jiang, Tingming; Yang, Huiying; Yu, Xue; Qiu, Jianbei; Yang, Yang Michael; Xu, Xuhui

doi:10.1002/adma.202102529

Cited by 179 publications

(177 citation statements)

References 35 publications

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“…Furthermore, the absorption coefficients of these materials over a broad range of photon energy were analyzed considering the XCOM‐NIST database and the results are shown in Figure a. [ 17 ] Notably, CsPbBr 3 NCs shown excellent absorbance at the range of 20–170 keV (Figure 2a inset), covering the range of common nondestructive detection and medical digital radiography. The attenuation efficiency to 40 keV X‐ray radiation as a function of thickness (Figure 2b) was extracted from Figure 2a.…”

Section: Resultsmentioning

confidence: 99%

Cesium Lead Halide Nanocrystals based Flexible X‐Ray Imaging Screen and Visible Dose Rate Indication on Paper Substrate

Chen

Wang

Peng

et al. 2022

Advanced Optical Materials

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Metal halide semiconductors have huge potential on X‐ray detection, due to their high atomic number, adjustable photoluminescence wavelength, superior stability, and simple fabrication process. Here, cesium lead halide nanocrystals (CsPbX3 NCs) are fabricated on paper substrate as scintillator screen for the first time. By means of all‐solution processed spray‐coating method with optimization of polymethyl methacrylate, large‐area (>600 cm2) and low‐cost (0.0975 dollar cm−2) flexible scintillator screens are obtained with high resolution (≈5 lp mm−1), low detection limit (2.97 μGy s−1), high light yield (≈30000 photons/MeV), and fast response speed (<15 ms). The screen can achieve high‐resolution X‐ray non‐distortion imaging for non‐planar objects and realize battery check and safety monitoring at a broad range of photon energy (10–160 keV). In addition, real‐time dose rates can be easily estimated through counting the luminous arcs of the designed visible indicator. More important, the screen shows remarkable tolerance to high‐dose X‐ray radiation (tolerance over 60 Gyair continuous radiation with only 3% performance degradation), water soaking (2000 h), and conventional storage (over 300 days without apparent deterioration under ambient conditions). Hence, this work may provide huge potential in the field of medical diagnosis, non‐planar detection, and safety monitoring in the future.

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Section: Resultsmentioning

confidence: 99%

Cesium Lead Halide Nanocrystals based Flexible X‐Ray Imaging Screen and Visible Dose Rate Indication on Paper Substrate

Chen

Wang

Peng

et al. 2022

Advanced Optical Materials

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“…For indirect-type X-ray detection, large area scintillator screens based on CsPbBr 3 PNCs have been fabricated that exhibited a high resolution of 9.8 lp mm -1 and long-term radiostability in X-ray imaging. [27][28][29][30][31] However, the severe photon reabsorption in thick PNC films caused by the small Stokes shift between the absorption and emission spectrum (Figure 1a and S1, Supporting Information) impairs the light yield and hence the detection efficiency drastically. [32,33] Meanwhile, for direct-type X-ray conversion, a sensitivity of 1450 µC Gy air −1 cm −2 has been achieved in PNC based soft X-ray detectors with only 0.1 V bias voltage.…”

Section: Tuning the Photon Sensitization Mechanism In Metal-halide-pe...mentioning

confidence: 99%

Tuning the Photon Sensitization Mechanism in Metal‐Halide‐Perovskite‐Based Nanocomposite Films Toward Highly Efficient and Stable X‐Ray Detection

Wei

Tao

et al. 2022

Advanced Optical Materials

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Metal halide perovskites (MHPs) have emerged as promising X‐ray detection materials. However, most MHP‐based X‐ray detectors are incompatible for large‐area preparation and integration, and suffer from the serious ion migration issue. This work demonstrates a “perovskite‐in‐a‐host” nanocomposite structure for X‐ray detection, by embedding the perovskite nanocrystal (PNC) sensitizers in the organic interpenetrating charge transport channels to work as the X‐ray attenuation layer. Intriguingly, the photon sensitization mechanism can be readily tuned from indirect‐ to direct‐type X‐ray conversion by decreasing the ligand density on the PNC surface, which significantly increases the sensitivity to 5 696 µC Gyair–1 cm–2. Besides, the ion migration gets suppressed due to the ion blocking effect of the surrounding organic phase. Therefore, an ultra‐small dark current relative drift of 3.57 × 10–9 cm s–1 V–1 is achieved even under an extremely large electric field up to 5 100 V cm–1, ensuring a low detection limit down to 72 nGyair s–1. The superior sensitivity and biasing stability enable the high performance X‐ray imaging capability of the devices, which exhibit great potential in scaling up and integration for the flat panel imaging.

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“…Perovskite nanocrystals (NCs), including CsPbBr 3 NCs, [ 19 , 20 , 21 , 22 , 23 , 24 ] MAPbBr 3 NCs (MA = CH 3 NH 3 + ), [ 25 , 26 ] and so on, [ 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 ] have displayed great potential as a new promising class of scintillators because of their many advantages such as strong X‐ray absorption ability, high RL intensity, fast light decay, and low‐cost solution synthesis. More importantly, compared with the big single crystal scintillators, [ 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ] perovskite NCs scintillators are suitable for preparing thin scintillator films by using the promising bottom to up method due to their small sizes, quantum size effect, and tunable electronic bandgaps in the visible range.…”

Section: Introductionmentioning

confidence: 99%

“…For example, many perovskite NCs‐based scintillators screen have been developed and show the potential for X‐ray imaging with the advantage of low‐cost, easy for preparation, and high detection sensitivity. [ 12 , 19 , 22 , 24 , 30 , 44 ] However, many scintillator films preparation methods [ 23 , 31 , 45 , 46 , 47 , 48 ] require the addition of auxiliary film‐forming geopolymers, which causes the low equivalent density of scintillator material in the film and thus results in the low RL intensity. To ensure the enough light output, the thick film is required but is usually opaque, which greatly increase the light scattering and seriously reduce the imaging resolution.…”

Section: Introductionmentioning

confidence: 99%

Ultrathin, Transparent, and High Density Perovskite Scintillator Film for High Resolution X‐Ray Microscopic Imaging

Guo

Zhu

et al. 2022

Advanced Science

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Inorganic perovskite quantum dots CsPbX3 (X = Cl, Br, and I) has recently received extensive attention as a new promising class of X‐ray scintillators. However, relatively low light yield (LY) of CsPbX3 and strong optical scattering of the thick opaque scintillator film restrict their practical applications for high‐resolution X‐ray microscopic imaging. Here, the Ce3+ ion doped CsPbBr3 nanocrystals (NCs) with enhanced LY and stability are obtained and then the ultrathin (30 µm) and transparent scintillator films with high density are prepared by a suction filtration method. The small amount Ce3+ dopant greatly enhances the LY of CsPbBr3 NCs (about 33 000 photons per MeV), which is much higher than that of bare CsPbBr3 NCs. Moreover, the scintillator films made by these NCs with high density realize a high spatial resolution of 862 nm thanks to its thin and transparent feature, which is so far a record resolution for perovskite scintillator‐based X‐ray microscopic imaging. This strategy not only provides a simple way to increase the resolution down to nanoscale but also extends the application of as‐prepared CsPbBr3 scintillator for high resolution X‐ray microscopic imaging.

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Reproducible X‐ray Imaging with a Perovskite Nanocrystal Scintillator Embedded in a Transparent Amorphous Network Structure

Abstract: Research data are not shared.

Cited by 179 publications

References 35 publications

Cesium Lead Halide Nanocrystals based Flexible X‐Ray Imaging Screen and Visible Dose Rate Indication on Paper Substrate

Cesium Lead Halide Nanocrystals based Flexible X‐Ray Imaging Screen and Visible Dose Rate Indication on Paper Substrate

Tuning the Photon Sensitization Mechanism in Metal‐Halide‐Perovskite‐Based Nanocomposite Films Toward Highly Efficient and Stable X‐Ray Detection

Ultrathin, Transparent, and High Density Perovskite Scintillator Film for High Resolution X‐Ray Microscopic Imaging

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