Modified timing characteristic of a scintillation detection system with photonic crystal structures

Liu, Jinliang; Liu, Bo; Zhu, Zhichao; Chen, Liang; Hu, Jing; Xu, Mengxuan; Cheng, Chuanwei; Ouyang, Xiaoping; Zhang, Zhongbing; Ruan, Jinlu; He, Shiyi; Liu, Linyue; Gu, Ming; Chen, Hong

doi:10.1364/ol.42.000987

Cited by 16 publications

(9 citation statements)

References 22 publications

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“…The gain in UV-excited luminescence (see Section 7.2) was measured to be 2.49 for 90 nm ALD of TiO 2 and the unwrapped configuration (sample SA Liu1 ). A similar work has been carried out by the same authors [50] with additional CTR measurements. The crystals used were cylinders of LYSO:Ce, 25 × 12 mm 3 wrapped with Teflon on the non-readout faces.…”

Section: Phc Slab Periodicity Obtained With Self-assemblymentioning

confidence: 89%

“…Also in this case, Si 3 N 4 and TiO 2 are good candidates as high RI materials. An example of using ALD to increase the effective RI of a pattern produced with polystyrene nanospheres, a technique explained in Section 6.4.1, is given in [49,50].…”

Section: Phc Slab Production Methodsmentioning

confidence: 99%

“…Alternatively, one can deposit a high refractive index material layer on top of the nano-spheres, such as TiO 2 . An example is given in [50] and is shown in Figure 17. The advantages of these techniques are that they are relatively fast and cost-effective, which makes it an attractive patterning option.…”

Section: Self-assemblymentioning

confidence: 99%

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Enhancing Light Extraction of Inorganic Scintillators Using Photonic Crystals

et al. 2018

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Abstract:Inorganic scintillators are commonly used as sensors for ionizing radiation detectors in a variety of applications, ranging from particle and nuclear physics detectors, medical imaging, nuclear installations radiation control, homeland security, well oil logging and a number of industrial non-destructive investigations. For all these applications, the scintillation light produced by the energy deposited in the scintillator allows the determination of the position, the energy and the time of the event. However, the performance of these detectors is often limited by the amount of light collected on the photodetector. A major limitation comes from the fact that inorganic scintillators are generally characterized by a high refractive index, as a consequence of the required high density to provide the necessary stopping power for ionizing radiation. The index mismatch between the crystal and the surrounding medium (air or optical grease) strongly limits the light extraction efficiency because of total internal reflection (TIR), increasing the travel path and the absorption probability through multiple bouncings of the photons in the crystal. Photonic crystals can overcome this problem and produce a controllable index matching between the crystal and the output medium through an interface made of a thin nano-structured layer of optically-transparent high index material. This review presents a summary of the works aiming at improving the light collection efficiency of scintillators using photonic crystals since this idea was introduced 10 years ago.

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Section: Phc Slab Periodicity Obtained With Self-assemblymentioning

confidence: 89%

Section: Phc Slab Production Methodsmentioning

confidence: 99%

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Enhancing Light Extraction of Inorganic Scintillators Using Photonic Crystals

et al. 2018

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“…The PhC structure was realized by ALD deposition of TiO 2 on hexagonally close packed self-assembled polystyrene nanospheres. Higher light extraction efficiency was demonstrated which led to higher coincidence timing resolution, which may improve timing characteristic for time-of-flight detection system [158] [160]. This ability to pattern hygroscopic perovskite material, combined with excellent scintillation properties of perovskite material will be promising for future applications.…”

Section: Nanostructuring Of Bulk Scintillatorsmentioning

confidence: 99%

Inorganic, Organic, and Perovskite Halides with Nanotechnology for High–Light Yield X- and γ-ray Scintillators

et al. 2019

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Trends in scintillators that are used in many applications, such as medical imaging, security, oil-logging, high energy physics and non-destructive inspections are reviewed. First, we address traditional inorganic and organic scintillators with respect of limitation in the scintillation light yields and lifetimes. The combination of high–light yield and fast response can be found in Ce 3 + , Pr 3 + and Nd 3 + lanthanide-doped scintillators while the maximum light yield conversion of 100,000 photons/MeV can be found in Eu 3 + doped SrI 2 . However, the fabrication of those lanthanide-doped scintillators is inefficient and expensive as it requires high-temperature furnaces. A self-grown single crystal using solution processes is already introduced in perovskite photovoltaic technology and it can be the key for low-cost scintillators. A novel class of materials in scintillation includes lead halide perovskites. These materials were explored decades ago due to the large X-ray absorption cross section. However, lately lead halide perovskites have become a focus of interest due to recently reported very high photoluminescence quantum yield and light yield conversion at low temperatures. In principle, 150,000–300,000 photons/MeV light yields can be proportional to the small energy bandgap of these materials, which is below 2 eV. Finally, we discuss the extraction efficiency improvements through the fabrication of the nanostructure in scintillators, which can be implemented in perovskite materials. The recent technology involving quantum dots and nanocrystals may also improve light conversion in perovskite scintillators.

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“…Considering all the above it seems clear that the control and precise understanding of the reactivity and thermal transformation of rare earth-based particles is essential to determine their suitability as constituting elements of more complex multiparticle functional materials. In this work we describe the synthesis of size-tuneable, anisotropic Eu:Lu(OH) 2 Cl microplatelets, with special emphasis on the characterisation of their thermal evolution into highly luminescent Eu:Lu 2 O 3 , which could be an extremely versatile platform for multiparticle composites or ceramics for several optical, photonics, or scintillation applications [20,21].…”

Section: Introductionmentioning

confidence: 99%

Heat-Induced Transformation of Luminescent, Size Tuneable, Anisotropic Eu:Lu(OH)2Cl Microparticles to Micro-Structurally Controlled Eu:Lu2O3 Microplatelets

2021

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Synthetic procedures to obtain size and shape-controlled microparticles hold great promise to achieve structural control on the microscale of macroscopic ceramic- or composite-materials. Lutetium oxide is a material relevant for scintillation due to its high density and the possibility to dope with rare earth emitter ions. However, rare earth sesquioxides are challenging to synthesise using bottom-up methods. Therefore, calcination represents an interesting approach to transform lutetium-based particles to corresponding sesquioxides. Here, the controlled solvothermal synthesis of size-tuneable europium doped Lu(OH)2Cl microplatelets and their heat-induced transformation to Eu:Lu2O3 above 800 °C are described. The particles obtained in microwave solvothermal conditions, and their thermal evolution were studied using powder X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM), optical microscopy, thermogravimetric analysis (TGA), luminescence spectroscopy (PL/PLE) and infrared spectroscopy (ATR-IR). The successful transformation of Eu:Lu(OH)2Cl particles into polycrystalline Eu:Lu2O3 microparticles is reported, together with the detailed analysis of their initial and final morphology.

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Modified timing characteristic of a scintillation detection system with photonic crystal structures

Cited by 16 publications

References 22 publications

Enhancing Light Extraction of Inorganic Scintillators Using Photonic Crystals

Enhancing Light Extraction of Inorganic Scintillators Using Photonic Crystals

Inorganic, Organic, and Perovskite Halides with Nanotechnology for High–Light Yield X- and γ-ray Scintillators

Heat-Induced Transformation of Luminescent, Size Tuneable, Anisotropic Eu:Lu(OH)2Cl Microparticles to Micro-Structurally Controlled Eu:Lu2O3 Microplatelets

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