The effect of co-doping on the growth stability and scintillation properties of lutetium oxyorthosilicate

Spurrier, M.A.; Szupryczyński, P.; Rothfuss, H.; Yang, Kan; Carey, A.A.; Melcher, Charles L.

doi:10.1016/j.jcrysgro.2007.10.075

Cited by 45 publications

(32 citation statements)

References 11 publications

(12 reference statements)

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“…[ 47,48 ] The quantum effi ciency (QE) calibration of the HPMT allowed us to evaluate the LY values from N phels ( E ) photoelectron yields even in the green spectral range where QEs are below 10%; the error of the LY values was ± 5%. The N phels ( E ) values were measured from 8 to 1300 keV using different radioisotopes, such as 22 Co, etc. The scintillation decay curves were obtained using a Hamamatsu PMT U7600 (Hamamatsu Co., Japan) and digital oscilloscope (Tektronix TDS3052, Tektronix, Inc., USA) under excitation by 511 keV photons from a 22 Na source.…”

Section: Methodsmentioning

confidence: 99%

“…The N phels ( E ) values were measured from 8 to 1300 keV using different radioisotopes, such as 22 Co, etc. The scintillation decay curves were obtained using a Hamamatsu PMT U7600 (Hamamatsu Co., Japan) and digital oscilloscope (Tektronix TDS3052, Tektronix, Inc., USA) under excitation by 511 keV photons from a 22 Na source. To enhance the collection of scintillation photons, a Tefl on refl ection tape was used to cover the samples.…”

Section: Methodsmentioning

confidence: 99%

“…[ 21 ] This result is in accordance with previous fi ndings obtained for LSO:Ce crystals, showing that Me 2+ co-doping (Me = Ca, Mg) signifi cantly increases the LY and shortens the scintillation decay time. [ 22,23 ] The presence of Ce 4+ centers in the LSO:Ce 3+ ,Me 2+ structure due to local charge compensation following Me 2+ co-doping was clearly be identifi ed by its charge transfer (CT) absorption located in the UV and considered responsible for the improved scintillation performance displayed by the material. [ 24,25 ] Participation of Ce 4+ in the scintillation process was suggested to occur also in sol-gel silica glasses.…”

Section: Introductionmentioning

confidence: 99%

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Towards Bright and Fast Lu₃Al₅O₁₂:Ce,Mg Optical Ceramics Scintillators

Liu

Mareš

Feng

et al. 2016

Advanced Optical Materials

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needed. Within the last two decades, a number of excellent scintillators based on Ce 3+ and Pr 3+ -doped materials, together with truly novel nanoscintillators, nanocomposites, and phase-separated material systems, have been discovered and studied in depth. [1][2][3][4][5][6][7][8] This high R&D activity in the scintillator fi eld was triggered by the pressing needs of modern medical imaging and radiotherapy, of high-energy physics, homeland security, and environmental applications. Among them, Cedoped Lu 3 Al 5 O 12 (LuAG:Ce) aluminum garnets have attracted much attention because of their relatively high density of 6.73 g cm −3 , 5d -4f electric dipole allowed radiative transition of Ce 3+ with emission at around 500-550 nm, fast scintillation response of about 60 ns, and high theoretical light yield (LY) value of 60000 photons/MeV. [ 9,10 ] It was found that LuAG:Ce single crystal containing 0.55 at% Ce 3+ ions prepared by Bridgman technique is a highly competitive scintillator displaying a LY of about 26000 photons/MeV with a shaping time of 1.5 μs, close to that of Lu 2 SiO 5 :Ce (LSO:Ce). [ 11 ] Based on the understanding of defect chemistry, an effective bandgap engineering approach was successfully applied to the LuAG system. Multicomponent garnets, featuring a balanced admixture of Gd and Ga cations in the Lubased garnet structure, form a new family of materials with an amazingly high light yield up to 58000 photons/MeV, a value exceeding that of the best Lu 2-x Y x SiO 5 :Ce (LYSO:Ce) materials by about 40%. [12][13][14][15] Therefore, oxides based on garnet structure are presently considered as competitive candidates for advanced scintillation applications.However, the low segregation coeffi cient of Ce 3+ ions in the LuAG lattice is detrimental for the growth of homogeneously doped large LuAG:Ce single crystals, especially for high Ce 3+ concentrations (Ce 3+ > 0.2 at%). [ 16 ] It was also noticed that Lu Al antisite defects (AD) can severely deteriorate the scintillation characteristics of LuAG:Ce single crystals by acting as shallow traps, thus delaying the energy transport to the Ce 3+ emission centers. [ 17 ] Therefore, extensive research has recently been aimed at the preparation of ceramic analogues, which are characterized by lower preparation temperatures, more uniform doping, and lower cost. One point to consider is that during The choice of sintering agent appears critical to achieve both high optical transparency and scintillation performance. In this work, the optical investigations coupled with X-ray absorption near-edge spectroscopy evidence the benefi cial role of MgO sintering agent. Mg 2+ co-dopants in ceramics drive the partial conversion of Ce 3+ to Ce 4+ . The Ce 4+ center, however, does not impair the scintillation performance due to its capability to positively infl uence the scintillation process. The importance of simultaneous application of such co-doping and annealing treatment is also demonstrated. With 0.3 at% Mg, our ceramics display a light yield of ≈25000 photons/MeV wit...

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Towards Bright and Fast Lu₃Al₅O₁₂:Ce,Mg Optical Ceramics Scintillators

Liu

Mareš

Feng

et al. 2016

Advanced Optical Materials

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“…In [18], the Ø32 × 100 mm almost independent on the type of the crystal structure that was formed [16].…”

Section: Growth Of Lumentioning

confidence: 99%

“…However, in some cases [17,18] This shortcoming was suppressed by incorporation of additional compensating co-dopant of Zn into the structure.…”

Section: Growth Of Lumentioning

confidence: 99%

Czochralski Growth and Properties of Scintillating Crystals

2013

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The Czochralski method is one of the very few melt growth techniques that are industry friendly when considering the combination of quality, dimensions, and cost of the produced crystals suitable for their commercialization in scintillation detectors. This method is one of the oldest and most developed crystal growth processes regarding an adequate understanding the physical phenomena observed during solidication process and its practical expansion especially in the industrial scale production. It allows controllable formation of single-crystalline cylindrical ingots of various inorganic scintillation materials. The review summarizes recent progress on the Czochralski growth of a number of scintillation materials. The oxide crystals are mainly considered including the Ce and Pr--doped RE3Al5O12, RE = Y, Lu, aluminum garnets and newly discovered ultraecient Ce-doped Gd3(Ga,Al)5O12 multicomponent garnet, high density PbWO4 and CdWO4 tungstates, Ce-doped RE2SiO5, RE = Y, Gd, Lu, oxyorthosilicates and (Y,Lu)AlO3 aluminum perovskites and nally the classical Bi4Ge3O12 scintillator. Additionally, the details of the growth of other practically important non-oxide crystals, namely the Ce and Eu-doped LiCaAlF6 neutron and ultraecient Ce-doped LaBr3 scintillators, are discussed. The potential of novel micro-pulling down growth method is briey described in the combinatorial search for new scintillator materials. Selected luminescence and scintillation characteristics including the spectra and decay kinetics, light yield and radiation resistance are also illustrated and overviewed.

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Effect of Mg²⁺ co‐doping on the scintillation performance of LuAG:Ce ceramics

Liu

Feng

Zhou

et al. 2013

Physica Rapid Research Ltrs

153

115

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Ce‐doped Lu3Al5O12 optical ceramics co‐doped with Mg2+ are fabricated by solid‐state reaction method and further optimized by an air‐annealing process. Mg2+ co‐doping leads to a significant decrease of thermoluminescence intensity above room temperature and an increase of scintillation light yield (LY) value and fast component content even if the overall scintillation efficiency decreases. Scintillation LY of ∼21900 ph/MeV has been achieved with a short shaping time of 1 μs, and the ratio of LY values for 1 μs and 10 μs shaping times was as high as 79%. The acceleration of scintillation response induced by Mg2+ co‐doping and the role of Ce4+ ions in the scintillation mechanism are discussed.magnified image(© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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The effect of co-doping on the growth stability and scintillation properties of lutetium oxyorthosilicate

Cited by 45 publications

References 11 publications

Towards Bright and Fast Lu₃Al₅O₁₂:Ce,Mg Optical Ceramics Scintillators

Towards Bright and Fast Lu₃Al₅O₁₂:Ce,Mg Optical Ceramics Scintillators

Czochralski Growth and Properties of Scintillating Crystals

Effect of Mg²⁺ co‐doping on the scintillation performance of LuAG:Ce ceramics

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The effect of co-doping on the growth stability and scintillation properties of lutetium oxyorthosilicate

Cited by 45 publications

References 11 publications

Towards Bright and Fast Lu3Al5O12:Ce,Mg Optical Ceramics Scintillators

Towards Bright and Fast Lu3Al5O12:Ce,Mg Optical Ceramics Scintillators

Czochralski Growth and Properties of Scintillating Crystals

Effect of Mg2+ co‐doping on the scintillation performance of LuAG:Ce ceramics

Contact Info

Product

Resources

About

Towards Bright and Fast Lu₃Al₅O₁₂:Ce,Mg Optical Ceramics Scintillators

Towards Bright and Fast Lu₃Al₅O₁₂:Ce,Mg Optical Ceramics Scintillators

Effect of Mg²⁺ co‐doping on the scintillation performance of LuAG:Ce ceramics