On fast LuAG:Ce scintillation ceramics with Ca<sup>2+</sup> co‐dopants

Ma, Wanqiu; Jiang, Benxue; Feng, Xiqi; Huang, Xiaojia; Wang, Wei; Sreebunpeng, Krittiya; Zhang, Long

doi:10.1111/jace.17506

Cited by 13 publications

(8 citation statements)

References 37 publications

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“…Several strategies have been proposed to reduce carrier trapping and create additional routes of carrier transport to cerium ions in garnets by aliovalent co-doping with Mg 2+ , Ca 2+ , Li + , and transition metals. − Defect engineering by Mg 2+ co-doping − appeared to be the most promising and contributed to the acceleration of luminescence decay and increasing light yield. The Ce 4+ –Mg 2+ complexes that form due to charge compensation create an efficient channel of electron and hole capture by Ce 3+ luminescence centers. , …”

Section: Introductionmentioning

confidence: 99%

Impact of Carbon Co-Doping on the Optical and Scintillation Properties of a YAG:Ce Scintillator

Sidletskiy

Gerasymov

Boyaryntseva

et al. 2021

Crystal Growth & Design

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This paper addresses the carbon co-doping of Ce-doped garnets, an efficient scintillation material and white light phosphor. The composition and the optical and scintillation properties of carbon-co-doped Y3Al5O12 (YAG) are studied at different cerium and carbon concentrations. YAG:Ce,C crystals were grown in the Ar + CO atmosphere from W crucibles. The carbon concentration reaches 0.5 atom %, but it does not affect the Ce distribution coefficient. The appearance and elimination of color centers are discussed in comparison to Ce-free YAG:C crystals. The tuning of cerium and carbon concentrations provides a light yield enhancement of up to 29 600 phot/MeV. The achieved enhancement may extend the application range of garnet-type phosphors and scintillators.

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Section: Introductionmentioning

confidence: 99%

Impact of Carbon Co-Doping on the Optical and Scintillation Properties of a YAG:Ce Scintillator

Sidletskiy

Gerasymov

Boyaryntseva

et al. 2021

Crystal Growth & Design

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“…Based on the obtained results, it can be concluded that boron‐doped ceramics have a shorter decay time, which is required for scintillators. The decay times of this synthesized ceramic are one of the shortest compared with the work of other scientists (for YAG:Ce this varies from 58 to 60 ns, for LuAG this is from 54 to 50 ns) [31–33]. Although scintillation decay times have not been measured in this work, it can be argued from the literature that for both photoluminescence and scintillation decay times (decreases and increases), specific trends and values correlate [17, 34–36].…”

Section: Resultsmentioning

confidence: 80%

Synthesis and investigation of novel boron‐ and magnesium‐doped YAG:Ce and LuAG:Ce phosphor ceramics

Inkrataite,

Skruodiene,

Skaudzius

2024

Luminescence

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YAG:Ce and LuAG:Ce ceramics are widely used as scintillator materials that convert high‐energy radiation into visible light. For the practical application of such compounds, short decay times are a necessity. One way of shortening the existing decay times even more is to change the local environment of emitting ions by means of doping the matrix with additional elements, for example, boron or magnesium. Furthermore, boron ions also can help absorb gamma rays more efficiently, therefore improving overall applicability. Due to the aforementioned reasons, YAG and LuAG ceramics doped with cerium, boron, and magnesium were synthesized. Initial amorphous powders have been obtained by means of sol–gel synthesis and pressed into pellets under isostatic pressure and finally calcinated to form crystalline ceramics. The effects of boron and magnesium doping on the morphological, structural, and luminescence properties were investigated. The key results showed that doping with boron has indeed shortened the decay times of the garnet pellets. Overall, boron doping of ceramics is a relatively new research area; however, it is rather promising as it helps both to improve the luminescence properties and to increase particle growth rate.

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“…The reduction in the time constant can potentially be achieved through co-doping these materials with divalent ions. The effect has been well-demonstrated in LuAG, where Mg 2+ or Ca 2+ ions have suppressed slower components of the decay times 21 , and was recently explored in GGAG 22,23 . With faster rise and decay time constants, Gd-garnets could compete with LSO for the PET market.…”

Section: Ce Doped Garnetsmentioning

confidence: 87%

Novel high-stopping power scintillators for medical applications

Glodo,

van Loef,

Wang

et al. 2024

Medical Imaging 2024: Physics of Medical Imaging

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Development of new scintillator materials is a continuous effort, which recently has been focused on materials with higher stopping power. Higher stopping power can be achieved if the compositions include elements such as Tl (Z=81) or Lu (Z=71), as the compounds gain higher densities and effective atomic numbers. In context of medical imaging this translates into high detection efficiency (count rates), therefore, better image quality (statistics, thinner films) or lower irradiation doses to patients in addition to lowering of cost.Many known scintillator hosts, commercial or in research stages, are alkali metal halides (Cs, K, Rb). Often these monovalent ions can be replaced with monovalent Tl. Since Tl has a higher atomic number than for example Cs (55), this increases the stopping power of modified compounds. A good example of an enhanced host is Ce doped Tl2LaCl5 (5.2 g/cm 3 ), that mirrors less dense Ce doped K2LaCl5 (2.89 g/cm 3 ). Tl substation also increased the luminosity to >60,000 ph/MeV, as it often leads to a reduction in the bandgap. Another example is the dual mode (gamma/neutron) Ce doped Cs2LiYCl6 scintillator (density 3.31 g/cm 3 ). Substitution creates Ce doped Tl2LiYCl6 with density of 4.5 g/cm 3 , with much better stopping power and 20% higher light yield. Binary Tl-compounds are also of interest, although mostly they are semiconductors. Notable example of a scintillator is double doped TlCl with Be, I. This scintillator offers fast Cherenkov emission topped off with scintillation signal for achieving better energy resolution.Another family of interesting and dense compositions is based on Lu2O3 ceramics. Lu2O3 is one of the densest hosts (9.2 g/cm 3 ) available offering high stopping power. Lu2O3 doped with Eu 3+ is known to be a high luminosity scintillator, however, this emission is very slow (1-3 ms), which limits its utility. On the other hand, ultra-fast, 1 ns, scintillation can be achieved with the Yb 3+ doping that can be used for timing or high count-rate applications. However, while fast, Yb 3+ doped Lu2O3 has very low luminosity. Recently, we have shown a middle ground performance, with Lu2O3 doped with La 3+ . This composition generates scintillation with 1,000 ns decay time and up to 20,000 ph/MeV luminosity. Moreover, the material demonstrates very good energy resolution.

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On fast LuAG:Ce scintillation ceramics with Ca²⁺ co‐dopants

Cited by 13 publications

References 37 publications

Impact of Carbon Co-Doping on the Optical and Scintillation Properties of a YAG:Ce Scintillator

Impact of Carbon Co-Doping on the Optical and Scintillation Properties of a YAG:Ce Scintillator

Synthesis and investigation of novel boron‐ and magnesium‐doped YAG:Ce and LuAG:Ce phosphor ceramics

Novel high-stopping power scintillators for medical applications

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On fast LuAG:Ce scintillation ceramics with Ca2+ co‐dopants

Cited by 13 publications

References 37 publications

Impact of Carbon Co-Doping on the Optical and Scintillation Properties of a YAG:Ce Scintillator

Impact of Carbon Co-Doping on the Optical and Scintillation Properties of a YAG:Ce Scintillator

Synthesis and investigation of novel boron‐ and magnesium‐doped YAG:Ce and LuAG:Ce phosphor ceramics

Novel high-stopping power scintillators for medical applications

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Product

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On fast LuAG:Ce scintillation ceramics with Ca²⁺ co‐dopants