Thermally Activated Delayed Fluorescence Zirconium‐Based Perovskites for Large‐Area and Ultraflexible X‐ray Scintillator Screens

Abstract

Flexible scintillator screens with environmental stability, high sensitivity, and low cost have emerged as candidates for X‐ray imaging applications. Here, a large‐scale and cost‐efficient solution synthesis of the vacancy‐ordered double perovskite Cs2ZrCl6, which is characterized by thermal activation delayed fluorescence (TADF) dominated by triplet emission under X‐ray irradiation, is demonstrated. The large Stokes shift and efficient luminescence collection of TADF effectively ensure the light outcoupling efficiency. Further, flexible X‐ray scintillator screens with an area of 400 cm2 are prepared using poly(dimethylsiloxane) (PDMS) as the carrier, exhibiting excellent scintillation properties with light yields as high as 49 400 photons MeV−1, spatial resolutions up to 18 lp mm−1 and detection limits as low as 65 nGy s−1. Finally, the high‐quality imaging results of non‐planar and dynamic objects by such screens are demonstrated. It is believed that the explored Cs2ZrCl6@PDMS flexible scintillator screens would offer a big step toward expanding the application range of scintillators in different environments.

Hydrogen Bonds Strengthened Metal‐Free Perovskite for Degradable X‐ray Detector with Enhanced Stability, Flexibility and Sensitivity

“…Chemie intensity of them shows a decrease with increasing temperature until it disappears completely, indicating the presence of thermal quenching in MFPs. [42] In addition, there is a redshift of the luminescence peak of MPAZE-NH 4 I 3 • H 2 O at the temperature of 330-380 K. Combined with the TG analysis, this may originate from the band gap reduction caused by the weight loss of H 2 O in the crystal structure, which is consistent with the band gap results of theoretical simulations, further indicating that the change in the number and strength of hydrogen bonds by the introduced H 2 O can realize band gap modulation.…”

Highly resolved and refreshable X-ray imaging from Tb3+doped aluminosilicate oxyfluoride glass scintillators

“…Moreover, the profound ability of the X-ray imaging of the G-7Tb glass specimen possesses an observation limit exceeding 20 lp mm À1 , which is the highest spatial resolution for glass-based X-ray imaging to the best of our knowledge, 36 and it is even higher than some reported perovskite-type scintillators and Gd 2 O 2 S:Tb commercial intensifying screens. 34,[53][54][55]57,58 To further improve the XEL intensity and spatial resolution is still a mutual goal of researchers. The detailed information about the spatial resolution of different materials is listed in Table 3.…”

Hydrogen Bonds Strengthened Metal‐Free Perovskite for Degradable X‐ray Detector with Enhanced Stability, Flexibility and Sensitivity

“…Chemie Forschungsartikel intensity of them shows a decrease with increasing temperature until it disappears completely, indicating the presence of thermal quenching in MFPs. [42] In addition, there is a redshift of the luminescence peak of MPAZE-NH 4 I 3 • H 2 O at the temperature of 330-380 K. Combined with the TG analysis, this may originate from the band gap reduction caused by the weight loss of H 2 O in the crystal structure, which is consistent with the band gap results of theoretical simulations, further indicating that the change in the number and strength of hydrogen bonds by the introduced H 2 O can realize band gap modulation.…”