Perovskite Quantum Dot Radioluminescence Nuclear Battery:Spectral Regulation Research

In this paper,perovskite quantum dots?QDs?radioluminescent isotope batteries is proposed to meet the application requirements of low power micro-electromechanical systems for long-life power supply in space applications.The preparation and characterization of materials in isotope batteries,optimization of preparation process of QDs films,mechanism of quantum dot radioluminescence effect,emission spectrum regulation output performance of batteries and performance gain analysis were also studied.The main research contents are summarized as follows:1)All-inorganic perovskite quantum dots CsPbX₃?X=Cl,Br,I?with different emission wavelengths were prepared by hot-injection method,which emission spectrum can cover 400-750 nm of visible light band.CsPbBr₃ QDs with toluene and n-hexane as solvents with average particle sizes of 8.13 nm and 9.63 nm,respectively were prepared.The radioluminescence of CsPbBr₃ QDs in toluene solvents is more than 18.1%of the total fluorescence under the tube voltage is 20-60 kV and the tube current is 100-1000?A.The radioluminescence of CsPbBr₃ QDs in n-hexane solvents is produced entirely by the QDs itself.CsPbX₃ QDs thin films were prepared by blending-method in the thickness range of 100-150?m.After optimizing the preparation process,CsPbX₃ QDs thin films were prepared by in-situ polymerization in a thickness range of 24-342?m.2)Perovskite quantum dots were used to regulate the emission spectra of PPO.The FWHM of CsPbBr_1.5I_1.5QD/PPO and CsPbBr₃ QD/PPO were 16.1 and 10.2 nm,respectively.The optimum mass concentrations of PPO,POPOP/PPO and QD/PPO systems were determined to be 2 mg/mL?PPO?,0.2 mg/mL?POPOPOP?and 2.5 mg/mL?CsPbBr₃ QDs?,respectively.The optical properties of QD/PPO system are 3.16-3.26 times that of PPO system.The electrical properties of QD/PPO and POPOPO/PPO radioluminescent isotope batteries were characterized.The maximum output power of POPOP/PPO system is 1.20-1.81 times that of PPO system.The maximum output power of QD/PPO system is 1.91-2.53 times that of PPO system.The overall electrical performance of QD/PPO system is better than that of POPOP/PPO system.3)Three types of radioactive source models of external radiation source,solid source and liquid source were simulated by MCNP.The maximum output power of single-junction and triple-junction GaAs liquid source isotope batteries calculated by MCNP simulation is 62.68 nW and 1.15?W,respectively.The combination of liquid fluorescent materials and liquid radiation sources is an effective scheme to significantly enhance energy deposition in fluorescent materials,which provides a theoretical basis for the development of isotope batteries based on liquid radiation sources and liquid fluorescent materials.The research work in this paper breaks through the types of fluorescent materials in conventional radioluminescent isotope batteries,which can be used as a feasibility analysis and an important experimental basis for the development of quantum dots radioluminescent isotope batteries.As a feasible strategy to significantly improve the output power of the radioluminescent isotope batteries,it lays a reference and technical basis for the development of isotope batteries for low-power MEMS in space applications.At the same time,the strategy of using all-inorganic perovskite quantum dots to regulate the emission spectrum of fluorescent materials has potential applications in the fields of isotope battery,nuclear detection and nuclear medicine imaging.