Spectroscopic analysis of LYSO:Ce crystals

Martins, A. F.; Carreira, J. F. C.; Rodrigues, Joana; Sédrine, N. Ben; Castro, I.F.; Correia, P.M.M.; Veloso, J.F.C.A.; Rino, L.; Monteiro, T.

doi:10.1016/j.saa.2016.04.019

Cited by 17 publications

(8 citation statements)

References 14 publications

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“…2 a, the scintillation and OSL show great similarity, as we observe all spectra to have the same rising edge and shape, characteristic of the absorption edge and emission bands, respectively. Furthermore, we are also able to resolve the 5d–4 and 5d–4 transition of the cerium one center 25 with emission wavelengths at 390 nm and 425 nm, respectively (marked by the blue and green arrow in the Fig. 2 a).…”

Section: Resultsmentioning

confidence: 83%

Optically stimulated luminescence in state-of-the-art LYSO:Ce scintillators enables high spatial resolution 3D dose imaging

Jensen

Nyemann

Muren

et al. 2022

Sci Rep

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In this contribution, we study the optically stimulated luminescence (OSL) exhibited by commercial $$\hbox {Lu}_{(2-x)}\hbox {Y}_x\hbox {SiO}_5$$ Lu ( 2 - x ) Y x SiO 5 :Ce crystals. This photon emission mechanism, complementary to scintillation, can trap a fraction of radiation energy deposited in the material and provides sufficient signal to develop a novel post-irradiation 3D dose readout. We characterize the OSL emission through spectrally and temporally resolved measurements and monitor the dose linearity response over a broad range. The measurements show that the $$\hbox {Ce}^{3+}$$ Ce 3 + centers responsible for scintillation also function as recombination centers for the OSL mechanism. The capture to OSL-active traps competes with scintillation originating from the direct non-radiative energy transfer to the luminescent centers. An OSL response on the order of 100 ph/MeV is estimated. We demonstrate the imaging capabilities provided by such an OSL photon yield using a proof-of-concept optical readout method. A 0.1 $$\hbox {mm}^3$$ mm 3 spatial resolution for doses as low as 0.5 Gy is projected using a cubic crystal to image volumetric dose profiles. While OSL degrades the intrinsic scintillating performance by reducing the number of scintillation photons emitted following the passage of ionizing radiation, it can encode highly resolved spatial information of the interaction point of the particle. This feature combines ionizing radiation spectroscopy and 3D reusable dose imaging in a single material.

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Section: Resultsmentioning

confidence: 83%

Optically stimulated luminescence in state-of-the-art LYSO:Ce scintillators enables high spatial resolution 3D dose imaging

Jensen

Nyemann

Muren

et al. 2022

Sci Rep

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“…The photons coming from the pump spot at propagate in the crystal towards the output face by TIR in directions included in a cone (called the output escape cone) with an apex angle , being the refractive index of the crystal. In 22 we have shown that the average propagation distance is with …”

Section: Spectroscopic Investigationsmentioning

confidence: 95%

“…The two resulting Ce 3+ centers, usually referred as Ce1 and Ce2, have different optical properties and hence different quantum yields. Ce1 has the highest quantum yield, measured at 78% at T = 14 K 22 , with main emission peaks at 393 and 427 nm 23 , whereas Ce2 has weaker quantum yield although it is the most abundant 24 with main emission peak around 460 nm. As Ce1 and Ce2 centers notably present excitation bands at 356 and 376 nm respectively 23 , both are excited when performing room temperature excitation at 365 nm, so that the resulting mean quantum yield is an average between the two centers contributions.…”

Section: Spectroscopic Investigationsmentioning

confidence: 99%

Ce:LYSO, from scintillator to solid-state lighting as a blue luminescent concentrator

Lopez

Pichon

Loiseau

et al. 2023

Sci Rep

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Cerium-doped lutetium-yttrium oxyorthosilicate (Ce:LYSO) is a well-known single crystal scintillator used in medical imaging and security scanners. Recent development of high power UV LED, matching its absorption band, questions the possibility to use Ce:LYSO in a new way: as LED-pumped solid-state light source. Since Ce:LYSO is available in large size crystals, we investigate its potential as a luminescent concentrator. This paper reports an extensive study of the performance in close relation to the spectroscopic properties of this crystal. It gives the reasons why the Ce:LYSO crystal tested in this study is less efficient than Ce:YAG for luminescent concentration: limited quantum efficiency and high losses coming from self-absorption and from excited-state absorption are playing key roles. However, we demonstrate that a Ce:LYSO luminescent concentrator is an innovative source for solid-state lighting. Pumped by a peak power of 3400 W in quasi-continuous wave regime (40 µs, 10 Hz), a rectangular (1 × 22 × 105 mm3) Ce:LYSO crystal delivers a broadband spectrum (60 nm FWHM) centered at 430 nm. At full output aperture (20 × 1 mm2), it emits a peak power of 116 W. On a squared output surface (1 × 1 mm2) it emits 16 W corresponding to a brightness of 509 W cm–2 sr–1. This combination of spectrum power and brightness is higher than blue LEDs and opens perspectives for Ce:LYSO in the field of illumination namely for imaging.

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“…The light output of the Lu 1.8 Y 0.2 SiO 5 (LYSO) scintillator is about 26,000 photons/MeV, and the refractive index is 1.82 [ 33 ]. γ photons with an energy of 511 keV can produce about 13,000 scintillating photons through interactions in the LYSO scintillator.…”

Section: Methodsmentioning

confidence: 99%

Optical Simulation and Experimental Assessment with Time–Walk Correction of TOF–PET Detectors with Multi-Ended Readouts

Xie

Zhu

Zhang

et al. 2021

Sensors

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As a commonly used solution, the multi-ended readout can measure the depth-of-interaction (DOI) for positron emission tomography (PET) detectors. In the present study, the effects of the multi-ended readout design were investigated using the leading-edge discriminator (LED) triggers on the timing performance of time-of-flight (TOF) PET detectors. At the very first, the photon transmission model of the four detectors, namely, single-ended readout, dual-ended readout, side dual-ended readout, and triple-ended readout, was established in Tracepro. The optical simulation revealed that the light output of the multi-ended readout was higher. Meanwhile, the readout circuit could be triggered earlier. Especially, in the triple-ended readout, the light output at 0.5 ns was observed to be nearly twice that of the single-ended readout after the first scintillating photon was generated. Subsequently, a reference detector was applied to test the multi-ended readout detectors that were constructed from a 6 × 6 × 25 mm3 LYSO crystal. Each module is composed of a crystal coupled with multiple SiPMs. Accordingly, its timing performance was improved by approximately 10% after the compensation of fourth-order polynomial fitting. Finally, the compensated full-width-at-half-maximum (FWHM) coincidence timing resolutions (CTR) of the dual-ended readout, side dual-ended readout, and triple-ended readout were 216.9 ps, 231.0 ps, and 203.6 ps, respectively.

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Spectroscopic analysis of LYSO:Ce crystals

Cited by 17 publications

References 14 publications

Optically stimulated luminescence in state-of-the-art LYSO:Ce scintillators enables high spatial resolution 3D dose imaging

Optically stimulated luminescence in state-of-the-art LYSO:Ce scintillators enables high spatial resolution 3D dose imaging

Ce:LYSO, from scintillator to solid-state lighting as a blue luminescent concentrator

Optical Simulation and Experimental Assessment with Time–Walk Correction of TOF–PET Detectors with Multi-Ended Readouts

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