Research on in situ growth of perovskite films and their applications in X-ray detection

Deep sea mineral analysis with X-ray requests ultra water-stable and large-scale X-ray sensitive materials. Perovskite nanocrystals are promising for X-ray detection. However, their abundant surface defects usually affect their luminescence properties and long-term stability, which in turn hinders their practical application in the field of deep-sea mineral analysis. Here, this work proposes a strategy combining polymer in-situ encapsulation and vitamin doping. Perovskite nanocrystals grow in situ in the polymer matrix, which can maintain over 96% of the initial luminous intensity in water and ambient condition for 480 and 2880 hours, respectively. Moreover, the perovskite film exhibits excellent stability in high pressure/salted/sulfur-rich environment. In addition, vitamins are introduced into the perovskite precursor, which promote the crystallization of perovskite film, reducing grain boundaries and adequately passivating the surface defects. The photoluminescence and radioluminescence intensity of the perovskite film are improved nearly 2 folds. By in-situ spraying growth method, the perovskite film is obtained over 100 cm² with high uniformity (root-mean-square roughness of 1.06 nm). The perovskite scintillator film exhibits high spatial resolution of 9.0 lp mm^-1. Furthermore, we demonstrate X-ray detector base on the perovskite scintillator film with a detection limit of 8.7 μGyair s^-1. This work is expected to promote the development of X-ray detection.

Related publications:

1. Large-area in situ growth of a flexible perovskite scintillator film for X-ray indirect detection applications

Lv, H.; Hao, Q.; Yan, N.; Ma, L.; Chen, M., J. Mater. Chem. C, 2024,12, 8970-8976.