Enhanced multimodal luminescence and ultrahigh stability Eu3+-doped CsPbBr3 glasses for X-ray detection and imaging

Abstract

As an emerging scintillation material, metal halide perovskite ( CsPbX 3 ) has been deemed the most potentially valuable candidate in X-ray detection and medical imaging. Nevertheless, it is a continuing challenge to implement efficient radioluminescence (RL) with high radiation stability and moisture resistance. Moreover, the optimized luminescence properties and excellent uniformity of CsPbX 3 glass are also key points for obtaining perfect X-ray images. Herein, we have successfully precipitated Eu 3 + -doped CsPbBr 3 nanocrystals (NCs) with improved photoluminescence quantum yield ( ≈ 58.6 % ) because partial Eu 3 + entered the perovskite lattice in a robust borosilicate glass matrix by in situ crystallization. The small amount of Eu addition made the lattice of NCs shrink and promoted uniform distribution of CsPbBr 3 NCs in the glass, which effectively reduced the light scattering of the sample. Subsequently, multimodal RL intensity of the CsPbBr 3 / CsPbBr 3 :xEu NCs glasses (CPB-0Eu/CPB-xEu) as a function of X-ray dose rate showed a superlinear relationship to the benefit of obtaining satisfactory X-ray images. Also, the outstanding radiation stability and water resistance of CPB-xEu were confirmed due to the protection of the robust glass matrix. Finally, an X-ray imaging system using a CPB-xEu scintillator was constructed, and the spring in the opaque sample was legibly detected under the motivation of X-rays, indicating that CsPbX 3 glasses possess extensive application prospects in terms of X-ray detection and medical imaging.