Light yield non-proportionality and energy resolution of Lu1.95Y0.05SiO5:Ce and Lu2SiO5:Ce scintillation crystals

Wanarak, Chalerm; Chewpraditkul, Weerapong; Phunpueok, Akapong

doi:10.1016/j.proeng.2012.02.010

Cited by 24 publications

(13 citation statements)

References 14 publications

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“…The non-proportionality of LYSO:Ce at 100-120 keV X-ray is 80-85% relative to the yield at 662 keV. 38 Assuming the same non-proportionality factor for the electron beam, the excitonic emission yield (525 nm line) is 122 ph/MeV, of which only 68 ph/MeV belong to the ultrafast components with decay constant τ ≤ 1.1 ns. For comparison, the yield of PS emission band and defect band is 0.63% and 0.62% of LYSO:Ce, respectively, and, combined together, comprise 77% of total light output of CdSe/CdS@PS.…”

Section: Resultsmentioning

confidence: 99%

On the use of CdSe scintillating nanoplatelets as time taggers for high-energy gamma detection

et al. 2019

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The technological challenge imposed by the time resolution essential to achieve real-time molecular imaging calls for a new generation of ultrafast detectors. In this contribution, we demonstrate that CdSe-based semiconductor nanoplatelets can be combined with standard scintillator technology to achieve 80 ps coincidence time resolution on a hybrid functional pixel. This result contrasts with the fact that the overall detector light output is considerably affected by the loss of index-light-guiding. Here, we exploit the principle of 511 keV energy sharing between a high-Z, high stopping power bulk scintillator, and a nano-scintillator with sub-1 ns radiative recombination times, aiming at a breakthrough in the combined energy and time resolution performance. This proof-of-concept test opens the way to the design and study of larger size sensors using thin nanocomposite layers able to perform as efficient time taggers in a sampling detector geometry of new generation. npj 2D Materials and Applications (2019) 3:37; https://doi.

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Section: Resultsmentioning

confidence: 99%

On the use of CdSe scintillating nanoplatelets as time taggers for high-energy gamma detection

et al. 2019

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“…The weighted PDE of a Hamamatsu S13360 SiPM for co-doped LSO emission is reported to be 0.59 ± 0.03 [14]. The light yield non-proportionality with the deposited energy depends on the exact doping of the crystal, and different values were found in the literature, ranging from 0.55 to 0.7 at 15 keV [35,36]: we opted for NP = 0.65 ± 0.1, and its high relative error was the main contribution to the final error. Following the method explained by Vinogradov [37] and Kratochwil et al [38], the ECF at the operational bias voltage was measured to be 1.33 ± 0.07.…”

Section: Figurementioning

confidence: 99%

A new method to characterize low stopping power and ultra-fast scintillators using pulsed X-rays

Pagano

Kratochwil²,

Frank³

et al. 2022

Front. Phys.

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The demand for detectors with a time resolution below 100 ps is at the center of research in different fields, from high energy physics to medical imaging. In recent years, interest has grown in nanomaterials that, benefiting from quantum confinement effects, can feature ultra-fast scintillation kinetics and tunable emission. However, standard characterization methods for scintillation properties–relying on radiation sources with an energy range of several hundreds of keV–are not suitable for these materials due to their low stopping power, leading to a slowdown of this R&D line. We present a new method to characterize the time resolution and light output of scintillating materials, using a soft (0–40 keV energy) pulsed X-ray source and optimized high-frequency readout electronics. First, we validated the proposed method using standard scintillators. Then, we also demonstrated the feasibility to measure the time resolution and get an insight into the light output of nanomaterials (InGaN/GaN multi-quantum well and CsPbBr3 perovskite). This technique is, therefore, proposed as a fundamental tool for characterization of nanomaterials and, more in general, of materials with low stopping power to better guide their development. Moreover, it opens the way to new applications where fast X-ray detectors are requested, such as time-of-flight X-ray imaging.

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“…Moreover, from the linear response curves, we could indirectly obtain the scintillation light yield. The reference LYSO sample has a light yield of 33 200 photons per MeV . The response of Rb 2 CuBr 3 is three times higher than LYSO.…”

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confidence: 99%

Lead‐Free Halide Rb₂CuBr₃ as Sensitive X‐Ray Scintillator

et al. 2019

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into visible light that are further captured and converted into electrical signals by a following photomultiplier. [7][8][9][10][11] Scintillators have been actively utilized for radiation detection applications in many fields, like nondestructive inspection, medical imaging, and space exploration. Scintillator-based X-ray detectors are advantageous in terms of cost and stability than direct X-ray detectors (a-Se), and the current market of X-ray detectors is dominated by scintillators.The light yield of scintillators, as one of the most important figures of merit, determines the X-ray conversion efficiency and detection contrast. Liu and co-workers reported the good X-ray imaging properties from CsPbBr 3 nanocrystals [8] and Zhang et al. evaluated the light yield for CsPbBr 3 nanocrystals as 21 000 photons per MeV. [11] Such value is still much lower than traditional scintillators like Lu 1.8 Y 0.2 SiO 5 -Ce (LYSO, 33 200 photons per MeV), [12] CsI-Tl (54 000 photons per MeV) [12] and Gd 2 O 2 S-Tb (GOS, 60 000 photons per MeV) [13] etc. The major reason is that the small Stokes shift and the self-absorption effect for lead halide perovskites would severely restrict the light outcoupling efficiency in films and crystals, which require large thickness for complete X-ray attenuations. For scintillators, large Stokes shift and high photoluminescence efficiency are required to obtain high scintillation light yield. The recently emerged self-trapped exciton emissions from low dimensional perovskites exhibit large stokes shift and high PLQY, and may provide efficient X-ray scintillations, but have scarcely been studied. [14][15][16] Another severe issue restricting the applications of lead halide perovskite scintillators is the toxicity of lead element. The ionic nature of halide perovskites and high solubility in water may seriously harm the human health as well as the environment. It is thus of great significance to find lead-free perovskites or halide scintillators.Here we present 1D structured Rb 2 CuBr 3 as one new member of scintillators with exceptionally high light yield. Rb 2 CuBr 3 is obtained by direct reaction between RbBr and CuBr with phase-purity, high quality, and good stability. Its 1D crystal structure and soft crystal lattice facilitate the formation of self-trapped exciton, which emits at 385 nm with a large Stokes shift of 85 nm (0.91 eV) and 98.6% photoluminescence quantum yield. The high emission efficiency, large Stokes shift, strong X-ray attenuation, and good spectrum matching with the photomultiplier tube (PMT) or silicon photomultiplier Scintillators are widely utilized for radiation detections in many fields, such as nondestructive inspection, medical imaging, and space exploration. Lead halide perovskite scintillators have recently received extensive research attention owing to their tunable emission wavelength, low detection limit, and ease of fabrication. However, the low light yields toward X-ray irradiation and the lead toxicity of these perovskites severely restricts their practical ...

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Light yield non-proportionality and energy resolution of Lu1.95Y0.05SiO5:Ce and Lu2SiO5:Ce scintillation crystals

Cited by 24 publications

References 14 publications

On the use of CdSe scintillating nanoplatelets as time taggers for high-energy gamma detection

On the use of CdSe scintillating nanoplatelets as time taggers for high-energy gamma detection

A new method to characterize low stopping power and ultra-fast scintillators using pulsed X-rays

Lead‐Free Halide Rb₂CuBr₃ as Sensitive X‐Ray Scintillator

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Light yield non-proportionality and energy resolution of Lu1.95Y0.05SiO5:Ce and Lu2SiO5:Ce scintillation crystals

Cited by 24 publications

References 14 publications

On the use of CdSe scintillating nanoplatelets as time taggers for high-energy gamma detection

On the use of CdSe scintillating nanoplatelets as time taggers for high-energy gamma detection

A new method to characterize low stopping power and ultra-fast scintillators using pulsed X-rays

Lead‐Free Halide Rb2CuBr3 as Sensitive X‐Ray Scintillator

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Product

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Lead‐Free Halide Rb₂CuBr₃ as Sensitive X‐Ray Scintillator