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Advanced science: a highly efficient colloidal nanocrystalline scintillator without self absorption

wallpapers Cruise 2020-11-14

lead based halogen perovskite nanocrystals are widely used in the field of light-emitting diodes solar cells photoelectric detectors other optoelectronic devices due to their high fluorescence quantum yield (~ 100%) narrow emission line (12 ~ 42 nm) wide color gamut (~ 140% NTSC) low-cost solution preparation. In addition all inorganic perovskite nanocrystals as scintillators also show great potential in the field of X-ray detection imaging. Compared with traditional scintillators nanocrystalline scintillators have the advantages of low cost suitable for large area flexible scintillators become the next generation scintillators with great development prospects. However the existence of toxic element lead hinders the commercial development of perovskite nanocrystalline optoelectronic devices; secondly due to the small Stokes shift of lead halide perovskite nanocrystalline there is a serious self absorption phenomenon which leads to the low optical coupling output efficiency. Therefore the development of non-toxic colloidal nanocrystals with large Stokes shift high fluorescence quantum yield has become a research hotspot difficulty in this field.

colloidal nanocrystals of cs3cu2x5 (x = Cl Br I) were synthesized by thermal injection growth inhibitor. Due to the zero dimensional lattice structure these cs3cu2x5 nanocrystals exhibit self limited exciton luminescence large Stokes shift no self absorption. Among them the fluorescence quantum yield of cs3cu2i5 nanocrystals is as high as 73.7% the emission center wavelength is at 445 nm which shows good air stability. In view of the advantages of high efficiency photoluminescence light emission peak matching with the response peak of photomultiplier tube no self absorption high effective atomic number no high toxic elements cs3cu2i5 nanocrystalline is a good scintillator material. The results show that the light yield of cs3cu2i5 nanocrystals is 3.8 times higher than that of cspbbr3 nanocrystals which is up to 79279 photons / MeV. Through simple coating mobile phone camera clear X-ray imaging is obtained showing good application potential.

this work shows that colloidal nanocrystals with self limited exciton luminescence are good scintillator materials which are expected to be used in the next generation of large area flexible X-ray imaging. The related work is entitled "efficient reactive free Radiation Science in cs3cu2i5 nanocrystals with self traded exceptions" published online in advanced science( DOI:10.1002/advs.202000195 )Go ahead. The first author of this paper is Lian Linyuan a doctoral student of Huazhong University of science technology. This work is strongly supported by Professor Tang Jiang's team.

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