Li Xiaoming,Chen Jiaxin,Yang Dandan,Chen Xi,Geng Dongling,Jiang Lianfu,Wu Ye,Meng Cuifang,Zeng Haibo
Fluorescent type nuclear battery consisting of scintillator and photovoltaic device enables semipermanent power source for devices working under harsh circumstances without instant energy supply. In spite of the progress of device structure design, the development of scintillators is far behind. Here, a Cs 3 Cu 2 I 5 : Mn scintillator showing a high light yield of ~67000 ph MeV −1 at 564 nm is presented. Doping and intrinsic features endow Cs 3 Cu 2 I 5 : Mn with robust thermal stability and irradiation hardness that 71% or >95% of the initial radioluminescence intensity can be maintained in an ultra-broad temperature range of 77 K-433 K or after a total irradiation dose of 2590 Gy, respectively. These superiorities allow the fabrication of efficient and stable nuclear batteries, which show an output improvement of 237% respect to the photovoltaic device without scintillator. Luminescence mechanisms including self-trapped exciton, energy transfer, and impact excitation are proposed for the anomalous dramatic radioluminescence improvement. This work will open a window for the fields of nuclear battery and radiography.
Halide perovskites with excellent thermal stability will have better application prospects in the field of X-ray scintillation detectors. However, conventional scintillators exhibit low thermal stability, which limits their effectiveness in practical applications. In this study, we designed and developed a Cs 2 CuCl 4 scintillator with enhanced thermal stability. Through the preparation of Cs 2 CuCl 4 and the execution of heating and cooling cycle tests, we demonstrated that the Cs 2 CuCl 4 scintillator possesses high thermal stability. This stability is attributed to the high valence stability of the divalent copper ions, which are positioned in stable tetrahedral centers, thereby enhancing their structural integrity. The scintillator achieves a high steady-state light yield of 42,260 photons MeV −1 and exhibits the highest spatial resolution for powder-based scintillation screens at 20 lp mm −1 after undergoing cyclic treatment within the temperature range of 323 K to 673 K. Furthermore, the scintillator is capable of visualizing the melting of alloys, indicating its significant potential for application in high-temperature environments. This study offers a novel perspective on the design of scintillators with high thermal stability.
Ce 3+ -doped Gd 3 (Al 1-x Ga x ) 5 O 12 (Ce:GAGG) transparent ceramics were successfully prepared via a solid state reaction/oxygen sintering method. The effects of Ga substitution on the structure and optical properties of the ceramics were investigated. The highest quantum yield and relatively high scintillation light yield were achieved in the Gd 3 (Al 0.6 Ga 0.4 ) 5 O 12 . The investigated processing technique demonstrated advantages such as increased flexibility and short processing time, thus being very cost effective. The investigated approach provides a much more economical alternative to the conventional melt growth processes used to fabricate single crystals.
危险品化学品经营许可证（带存储）