Effects of annealing on the optical and scintillation properties of reddish Bi4Ge3O12 single crystals

Yuan, Lanying; Ni, Huaiwei; Chen, Junfeng; Song, Guilan; Qi, Xuejun; Li, Xiang; Karaki, Tomoaki; Wang, Dong

doi:10.1016/j.ceramint.2021.01.025

Cited by 7 publications

(4 citation statements)

References 27 publications

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“…However, conventional inorganic scintillators suffer from hightemperature and time-consuming preparation processes. [9][10][11][12] Meanwhile, although organic scintillators with fast decay time and low-cost preparation processes have attracted much attention, the low X-ray absorption coefficients often lead to undesirable scintillation performance. [13,14] Hence, new scintillation materials with a facile preparation process and effective detection efficiency of X-rays are urgently needed.…”

Section: Introductionmentioning

confidence: 99%

Manganese‐Halide Single‐Crystal Scintillator Toward High‐Performance X‐Ray Detection and Imaging: Influences of Halogen and Thickness

Zhang

Luo

et al. 2023

Advanced Optical Materials

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Scintillators, which can convert high‐energy ionizing radiation (e.g., X‐ or γ‐rays) into ultraviolet‐visible light, have been widely applied in medical and industrial fields. Developing new scintillation materials with high performance and low cost is very desirable in order to address the growing application demands. Among them, single‐crystal scintillators of organic‐inorganic hybrid metal halides (OIMHs) have attracted much attention because of their excellent optical transparency, suppressed light scattering, and facile solution preparation methods. Herein, three new centimeter‐sized (2‐DMAP)2MnX4 (2‐DMAP+ = 2‐dimethylaminopyridinium, X = Cl, Br, I) single crystals with high crystal quality are synthesized via the solvent evaporation method. Benefiting from the high optical transparency and remarkable luminescence property, (2‐DMAP)2MnBr4 delivers a high X‐ray light yield of 22 000 photons MeV−1, a low limit of detection of 9.50 nGy s−1, and an excellent X‐ray imaging spatial resolution of 20–25 lp mm−1. Moreover, the regulation of single‐crystal thickness from 0.31 mm to 3.03 mm can be easily achieved via a simple solution post‐treatment method, which has a significant influence on the transmittance, spatial imaging resolution, and detection limit. This work demonstrates a promising single‐crystal scintillator for the application of high‐resolution X‐ray imaging with low preparation cost and tunable thickness.

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Section: Introductionmentioning

confidence: 99%

Manganese‐Halide Single‐Crystal Scintillator Toward High‐Performance X‐Ray Detection and Imaging: Influences of Halogen and Thickness

Zhang

Luo

et al. 2023

Advanced Optical Materials

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“…22) In our previous work, the reddish BGO samples were annealed at 850 °C in oxygen, nitrogen, and vacuum atmospheres to confirm that oxygen vacancy is one of the important reasons why BGO is red. 16) The samples annealed in the oxygen atmosphere, the transmission intensity increases. By contrast, it is not enhanced in nitrogen and vacuum environments.…”

Section: Epr Analysis Oxygen Vacancy (V Omentioning

confidence: 99%

“…23) This trend is similar to our observation in the transmission, light output and energy resolution spectra. 16) 3.2. XPS analysis XPS was performed to confirm the surface composition in terms of the elemental and oxidation states of the reddish BGO samples.…”

Section: Epr Analysis Oxygen Vacancy (V Omentioning

confidence: 99%

“…Our previous work has reported the red color was eliminated by a modified oxygen annealing process, and mainly correlated with the distribution of oxygen vacancy (V o •• ) and Bi vacancy (V Bi ‴). 16) And the reddish can be eliminated by a modified oxygen-annealing. In the present study, deductions dealing with the nature and configuration of color centers is further complementarily verified to investigate the relationship of oxygen vacancy confirmed through electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

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Experimental verification of vacancy defects and their vital role on reddish Bi₄Ge₃O₁₂ single crystals

Yuan

Chen

et al. 2022

Jpn. J. Appl. Phys.

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Reddish bismuth germanate (Bi4Ge3O12, BGO) crystals are found during the industrial large-size and -scale crystal growth by Bridgman method, which directly causes visible absorption. The reddish can be eliminated by a modified oxygen-annealing. Oxygen vacancy is further confirmed through electron paramagnetic resonance, X-ray photoelectron spectroscopy, Raman spectroscopy to demonstrate the existence of vacancy defects and elucidate the nature and role. Bi vacancy in reddish BGO single crystals is verified via scanning transmission electron microscopy, energy-dispersive spectroscopy, and high-angle annular dark-field scanning TEM. The essence of annealing and vacancy evolution is also discussed.

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Reducing Luminescence Intensity and Suppressing Irradiation‐induced Darkening of Bi₄Ge₃O₁₂ by Ce‐doping for Radiation Detection

Tang,

Deng,

Liu

et al. 2023

Advanced Optical Materials

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Due to its short radiation length, moderate light output (8000‐9000 photons/MeV), high density (7.13 g cm−3), and non‐hygroscopicity, etc., Bi4Ge3O12 (BGO) material has been widely utilized as an advanced scintillator for irradiation detection. However, pure BGO cannot meet the requirements for future physics experiments and state‐of‐art industrial facilities coupled with a silicon photomultiplier (SiPM) due to its slow response time, poor radiation resistance, and excessive light output. Herein, a Ce‐doping strategy is reported for efficiently improving the overall performance (e.g., irradiation resistance, decay time, radioluminescence, and light output) of BGO that can be expectedly applied in future high energy physics detection. Ce‐doped BGO (BGO:Ce) displays higher radiation resistance ability under 10 h UV irradiation (97% of original) and a faster fluorescence lifetime (269 ns), superior to pure BGO. Furthermore, BGO:Ce shows ≈30% luminescence intensity of pure BGO, well eliminating the oversaturation of SiPM coupled with scintillation detectors. Theoretical calculations imply that an intense competition between electron or hole traps and Ce ions (Ce3+, Ce4+) can effectively reduce the concentration of color centers, thus enhancing irradiation resistance ability.

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Effects of annealing on the optical and scintillation properties of reddish Bi4Ge3O12 single crystals

Cited by 7 publications

References 27 publications

Manganese‐Halide Single‐Crystal Scintillator Toward High‐Performance X‐Ray Detection and Imaging: Influences of Halogen and Thickness

Manganese‐Halide Single‐Crystal Scintillator Toward High‐Performance X‐Ray Detection and Imaging: Influences of Halogen and Thickness

Experimental verification of vacancy defects and their vital role on reddish Bi₄Ge₃O₁₂ single crystals

Reducing Luminescence Intensity and Suppressing Irradiation‐induced Darkening of Bi₄Ge₃O₁₂ by Ce‐doping for Radiation Detection

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Effects of annealing on the optical and scintillation properties of reddish Bi4Ge3O12 single crystals

Cited by 7 publications

References 27 publications

Manganese‐Halide Single‐Crystal Scintillator Toward High‐Performance X‐Ray Detection and Imaging: Influences of Halogen and Thickness

Manganese‐Halide Single‐Crystal Scintillator Toward High‐Performance X‐Ray Detection and Imaging: Influences of Halogen and Thickness

Experimental verification of vacancy defects and their vital role on reddish Bi4Ge3O12 single crystals

Reducing Luminescence Intensity and Suppressing Irradiation‐induced Darkening of Bi4Ge3O12 by Ce‐doping for Radiation Detection

Contact Info

Product

Resources

About

Experimental verification of vacancy defects and their vital role on reddish Bi₄Ge₃O₁₂ single crystals

Reducing Luminescence Intensity and Suppressing Irradiation‐induced Darkening of Bi₄Ge₃O₁₂ by Ce‐doping for Radiation Detection