Efficient and self-healing copper halide Cs3Cu2Cl5 film assisted by microwave treatment for high-resolution X-ray imaging

Novel, Green, and Scalable Aqueous Synthesis of Yellow–Green Emitting Cs3Cu2Cl5 Scintillator and its Application in High‐Resolution TFT Panel for X‐Ray Imaging Detector

“…For the synthesized powder, see Figure S2, Supporting Information. The experimental X-ray diffraction powder pattern of the product, Figure 1d, matches well with that of Cs 3 Cu 2 Cl 5 (JCPDS 24-0247) and previous work, [2,18,25] indicating a high purity phase product. Scanning electron microscope (SEM) images and energy dispersive spectroscopy (EDS) elemental mapping, Figure 1e and Figure 1f, also confirm a uniform distribution of each constituent element, with an average ratio about Cs: Cu: Cl = 3: 2: 5 (c.f.…”

“…This asymmetric crystal structure makes it easier to generate self-trapped excitons (STEs) emission due to the instantaneous lattice distortion in the excited state of Cs 3 Cu 2 Cl 5 when irradiated by an external light source. [25] Calculated electronic band structure and projected density of states of Cs 3 Cu 2 Cl 5 based on density functional theory shows that Cs 3 Cu 2 Cl 5 exhibits a direct bandgap of 3.94 eV at the Γ point, as shown in Figure S1, Supporting Information. The conduction band minimum (CBM) of Cs 3 Cu 2 Cl 5 is primarily composed of Cu-4s and Cl-3p orbitals, whereas the valence band maximum (VBM) consists of Cu-3d and Cl-3p orbitals.…”

“…This is due to the fact that the transition and recombination process of photogenerated electrons is accelerated due to phonon assistance with increasing temperature. [25] A schematic diagram of the STE luminescence mechanism is shown in Figure 2f. At the corresponding excitation wavelength, electrons will transit from the valence band to the conduction band, and the excited state will produce transient lattice distortion under a strong electronphonon coupling effect, forming STE state.…”

“…[24] Very recently, Liu et al recorded a high X-ray imaging resolution of 20 lp mm −1 with a CCD camera for Cs 3 Cu 2 Cl 5 obtained by the hot injection method. [25] Due to the high quantum efficiency of α-Si:H photodiodes with respect to yellow-green light (≈70% at 550 nm), [26] Cs 3 Cu 2 Cl 5 could be coupled well with the TFT sensor panel commonly used in commercial X-ray imaging detectors.However, there are still many problems to be solved for the commercialization of Cs 3 Cu 2 Cl 5 as a scintillator for X-ray imaging detectors. For example, the hot injectionCopper-based metal halide scintillators have received increasing attention due to their high light yield and nontoxicity.…”

“…[24] Very recently, Liu et al recorded a high X-ray imaging resolution of 20 lp mm −1 with a CCD camera for Cs 3 Cu 2 Cl 5 obtained by the hot injection method. [25] Due to the high quantum efficiency of α-Si:H photodiodes with respect to yellow-green light (≈70% at 550 nm), [26] Cs 3 Cu 2 Cl 5 could be coupled well with the TFT sensor panel commonly used in commercial X-ray imaging detectors.…”