Wanting Gui,Lu Yao,Xunsheng Zhou,Qi Wu,Chao Li,Shi Zhang,Yunfeng Zhan,Cai Lin Wang
Ag-based metal halide scintillators have recently attracted significant interest for X-ray imaging due to their high light yield and ultra-fast decay lifetime. These properties are advantageous for thermal neutron detection, yet their application in this area have not been thoroughly explored. In this article, we investigate the properties of Cu-doped Cs
2
AgI
3
metal halide scintillators for X-ray imaging and thermal neutron detection. A simple synthesis process was employed to produce Cu-doped Cs
2
AgI
3
scintillators. The as-prepared Cu-doped Cs
2
AgI
3
exhibited intense green emission with a photoluminescence quantum yield (PLQY) of 55 ± 2.7%. Cu-doped Cs
2
AgI
3
/PVDF plastic scintillation screen has been prepared and achieved a resolution of 5 lp/mm under X-ray radiation. A composite consisting of
6
LiF, Cu-doped Cs
2
AgI
3
, and Poly (methyl methacrylate) (PMMA) was utilized for thermal neutron detection, achieving a light yield of about 12,526±9 photons/thermal neutron, which is almost twice that of a commercial
6
Li-glass (GS20) scintillator (7000 photons/thermal neutron). Effective neutron-gamma pulse discrimination was achieved using a network dynamics digital filter, effectively separating thermal neutron events from gamma events.
Radioluminescence materials (scintillators) are widely investigated because of their potential application in many fields, such as medical imaging, security-related techniques, and nondestructive inspection. However, the fabrication of scintillator materials with simultaneously fast response time, high absorption coefficient, and high light yield, as well as low toxicity is still a challenge. Herein, the synthesis of Cu(I)-doped Cs 2 AgI 3 single crystals (SCs) with a 1D crystal structure is presented. A bright blue-green photoluminescence (PL) is observed after incorporating Cu + into the Cs 2 AgI 3 SCs under UV irradiation at room temperature. The PL quantum yield of the doped samples can reach up to 73% at a Cu + concentration of 0.66%. Experimental and theoretical studies show that the blue-green emission may originate from self-trapped excitons, which is further verified by photophysical results from control experiments on pure Cs 2 AgI 3 SCs. Upon X-ray excitation, Cu-doped SCs exhibit fast scintillation decay time (288 ns), high light yield (27 000 photons per MeV), and high absorption coefficient compared with the commercial product (CsI: Tl). These results suggest that Cu-doped Cs 2 AgI 3 is an ideal scintillator, which will be a promising candidate for potential application in dynamic real-time imaging and radiation detection.
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