InGaN/GaN multiple quantum well for superfast scintillation application: Photoluminescence measurements of the picosecond rise time and excitation density effect

Toci, Guido; Gizzi, L. A.; Koester, P.; Baffigi, F.; Fulgentini, Lorenzo; Labate, L.; Hospodková, A.; Jarý, V.; Nikl, M.; Vannini, Matteo

doi:10.1016/j.jlumin.2018.12.034

Cited by 7 publications

(6 citation statements)

References 25 publications

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“…Another technique suitable for the nanofabrication of one dimensional semiconductors is metal-organic vapour-phase epitaxy (MOVPE), which allows for a layer by layer deposition of multiple quantum wells. Multiple hetero-structures composed of InGaN/GaN can be grown on a sapphire substrate (Toci et al 2019), which contributes to the mechanical stability of the scintillating layer. The replacement of the dead sapphire layer by state-of-the-art active materials such as LYSO or BGO could lead to a fully integrated nano-scintillator with a standard and fast scintillating phase.…”

Section: Enabling Technologiesmentioning

confidence: 99%

“…However, finding a technological efficient way to overcome the crystalline lattice mismatch between GaN and state-of-the-art scintillators is still a challenge. Currently, the maximum thickness obtained for this type of samples is limited to 10 µm (Toci et al 2019), which set constraints in the amount of energy deposited in the active region.…”

Section: Enabling Technologiesmentioning

confidence: 99%

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Roadmap toward the 10 ps time-of-flight PET challenge

Lecoq¹,

Morel²,

Prior³

et al. 2020

Phys. Med. Biol.

178

122

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Since the seventies, positron emission tomography (PET) has become an invaluable medical molecular imaging modality with an unprecedented sensitivity at the picomolar level, especially for cancer diagnosis and the monitoring of its response to therapy. More recently, its combination with X-ray computed tomography (CT) or magnetic resonance (MR) has added high precision anatomic information in fused PET/CT and PET/MR images, thus compensating for the modest intrinsic spatial resolution of PET. Nevertheless, a number of medical challenges call for further improvements in PET sensitivity. These concern in particular new treatment opportunities in the context personalized (also called precision) medicine, such as the need to dynamically track a small number of cells in cancer immunotherapy or stem cells for tissue repair procedures. A better signal-to-noise ratio (SNR) in the image would allow detecting smaller size tumours together with a better staging of the patients, thus increasing the chances of putting cancer in complete remission. Moreover, there is an increasing demand for reducing the radioactive doses injected to the patients without impairing image quality. There are three ways to improve PET scanner sensitivity: improving detector efficiency, increasing geometrical acceptance of the imaging device and pushing the timing performance of the detectors. Currently, some pre-localization of the electron-positron annihilation along a line-of-response (LOR) given by the detection of a pair of annihilation photons is provided by the detection of the time difference between the two photons, also known as the time-of-flight (TOF) difference of the photons, whose accuracy is given by the coincidence time resolution (CTR). A CTR of about 10 picoseconds FWHM will ultimately allow to obtain a direct 3D volume representation of the activity distribution of a positron emitting radiopharmaceutical, at the millimetre level, thus introducing a quantum leap in PET imaging and quantification and fostering more frequent use of 11 C radiopharmaceuticals. The present roadmap article toward the advent of 10 ps TOF-PET addresses the status and current/future challenges along the development of TOF-PET with the objective to reach this mythic 10 ps frontier that will open the door to real-time volume imaging virtually without tomographic inversion. The medical impact and prospects to achieve this technological revolution from the detection and image reconstruction point-of-views, together with a few perspectives beyond the TOF-PET application are discussed. ContentsA. Introduction B. Medical impact B1. Clinical and research impact of 10 ps TOF-PET B2. Innovation for dynamic imaging C. Detection of annihilation photons C1. Design criteria for the detection chain for 10 ps TOF-PET C2. Perspectives on using inorganic scintillators for fast timing application C3. Perspectives on using Cherenkov light for fast timing applications C4. Perspectives on using nano-scintillators for fast timing applications C5. Perspectives on LAr and/or LXe ...

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Section: Enabling Technologiesmentioning

confidence: 99%

Section: Enabling Technologiesmentioning

confidence: 99%

Roadmap toward the 10 ps time-of-flight PET challenge

Lecoq¹,

Morel²,

Prior³

et al. 2020

Phys. Med. Biol.

178

122

View full text Add to dashboard Cite

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“…Several types of scintillating nanomaterials with different levels of confinement (nanoplatelet, quantum wire, quantum dots) have been studied over many years. Among them, CdSe and CdSe/CdS [13,14,[27][28][29], CdZn/ZnS [30], ZnO quantum dot or nanoplatelets [15,[31][32][33], InGaN/GaN multi quantum wells [16,[34][35][36], the Cesium lead halide perovskyte CsPbX3 (X = Cl, Br,I) [17,37,38] for instance reach a fast photon emission with characteristic radiative decay times in the range of nanosecond or subnanosecond. An example of the decay time obtained for ZnO(Ga) nanomaterials is given in Figure 1 right.…”

Section: Nanomaterials Scintillatorsmentioning

confidence: 99%

Quantum Systems for Enhanced High Energy Particle Physics Detectors

et al. 2022

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Developments in quantum technologies in the last decades have led to a wide range of applications, but have also resulted in numerous novel approaches to explore the low energy particle physics parameter space. The potential for applications of quantum technologies to high energy particle physics endeavors has however not yet been investigated to the same extent. In this paper, we propose a number of areas where specific approaches built on quantum systems such as low-dimensional systems (quantum dots, 2D atomic layers) or manipulations of ensembles of quantum systems (single atom or polyatomic systems in detectors or on detector surfaces) might lead to improved high energy particle physics detectors, specifically in the areas of calorimetry, tracking or timing.

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“…The III-Nitride based semiconductors have attracted great attention for recent years because of many important application areas in technological devices [1]. Their application areas are listed as high electron mobility transistors (HEMTs), solar-blind detectors, detectors of ionizing radiation and scintillators, UV emitters for purification, curing and disinfection, light-emitting, and lasers diodes [2][3][4][5][6][7][8][9][10][11]. Especially, the GaN grown via Metal Organic Vapour Phase Epitaxy (MOVPE) is the most popular of the III-Nitride based semiconductors (AlN, InN, and their alloys) [12].…”

Section: Introductionmentioning

confidence: 99%

The GaN Epilayer Grown by MOVPE: Effect of The Different Nucleation Layer Temperatures

Altuntaş

Elagöz

2021

International Journal of Innovative Engineering Applications

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Original scientific paperEffect of different nucleation layer temperatures (LT-GaN growth temperature) on the properties of the subsequent GaN epilayer grown by MOVPE is investigated. In-situ reflectance curves demonstrate that higher LT-GaN growth temperatures cause fast coalescence (shorter transition time) of GaN nucleation islands. Both photoluminescence (PL) and high-resolution x-ray diffraction (HRXRD) are used to demonstrate the influence of LT-GaN growth temperature on optical and structural properties of subsequent GaN epilayer, respectively. It is observed that the change of LT-GaN growth temperature has an effect on both full-width at half-maximum (FWHM) values obtained from the results of HRXRD measurement and yellow luminescence peak intensity. It is seen that the yellow luminescence peak intensities for samples alter with LT-GaN growth temperature.

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InGaN/GaN multiple quantum well for superfast scintillation application: Photoluminescence measurements of the picosecond rise time and excitation density effect

Cited by 7 publications

References 25 publications

Roadmap toward the 10 ps time-of-flight PET challenge

Roadmap toward the 10 ps time-of-flight PET challenge

Quantum Systems for Enhanced High Energy Particle Physics Detectors

The GaN Epilayer Grown by MOVPE: Effect of The Different Nucleation Layer Temperatures

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