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.
Luminescence instability in service environments has limited the widespread use of halide perovskite materials, especially for X-ray energy conversion and detection/imaging. This work proposed a method for improving luminescence stability through polymer encapsulation, which is more convenient than compositional engineering and surface modulation. Meanwhile, the differences in the luminescence intensities of composite films synthesized by encapsulation of different polymer matrices and their luminescence stability under various harsh X-ray irradiation conditions were systematically investigated. The applications of the developed CsPbBr3-embedded polymer films with excellent luminescence performance and high service stability in X-ray radiation energy utilization and detection/imaging were discussed. The results show that CsPbBr3-embedded PS films can meet the spectral modulation requirements of radioluminescent materials for nuclear batteries and can also fulfill the needs of flexible X-ray imaging with a high spatial resolution.
He Chen,Lina Lv,Xiaoyu Li,Tingting Deng,Hao peng,Weicheng Xiang,Fangting Chi
Radioisotope thermoelectric generators (RTGs) produce electrical energy exclusively through the natural decay of radioactive materials, rendering them an ideal power source for space missions and other extreme environments. 241 Am is viewed as a promising substitute for 238 Pu as the heat-generating nuclide in these applications. However, there is currently no consensus on the sintering of 241 Am (Ⅲ) pellets. In this research, Nd (Ⅲ) oxide was used as a surrogate for americium (Ⅲ) oxide, and conventional cold-press-and-sinter methods were employed. Through a systematic investigation of the heating rate, holding time, and maximum temperature during the sintering of Nd (Ⅲ) oxide pellets made from commercial materials, an optimized sintering thermal cycle was developed. This curve enhances sintering efficiency and results in pellets with an open pore network, which is crucial for helium gas release. This work is significant in advancing the research and development of 241 Am nuclear batteries.
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