Crystal growth and characterization of LuAG:Ce:Tb scintillator

Zhuravleva, Mariya; Yang, Kan; Koschan, Merry; Szupryczyński, P.; Yoshikawa, Akira; Melcher, Charles L.

doi:10.1016/j.jcrysgro.2009.11.021

Cited by 12 publications

(3 citation statements)

References 15 publications

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“…An important aspect is reducing the temperature at which the single crystals are grown. The very high growth temperatures (e.g., ∼2000 °C in a typical Czochralski growth) are responsible for the high defect concentration in garnets, e.g., antisite defects . An option is to make transparent ceramics from (nano)crystalline powders at lower temperatures (1500–1700 °C), as has been successfully demonstrated for YAG. , This route might lead to more efficient LuAG:Ce scintillators and may also lead to a further enhancement of the light yield upon codoping with Tb 3+ .…”

Section: Resultsmentioning

confidence: 99%

Luminescence and Energy Transfer in Lu₃Al₅O₁₂ Scintillators Co-Doped with Ce³⁺ and Tb³⁺

Ogiegło

Zych²,

Ivanovskikh³

et al. 2012

J. Phys. Chem. A

104

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Lu(3)Al(5)O(12) (LuAG) doped with Ce(3+) is a promising scintillator material with a high density and a fast response time. The light output under X-ray or γ-ray excitation is, however, well below the theoretical limit. In this paper the influence of codoping with Tb(3+) is investigated with the aim to increase the light output. High resolution spectra of singly doped LuAG (with Ce(3+) or Tb(3+)) are reported and provide insight into the energy level structure of the two ions in LuAG. For Ce(3+) zero-phonon lines and vibronic structure are observed for the two lowest energy 5d bands and the Stokes' shift (2 350 cm(-1)) and Huang-Rhys coupling parameter (S = 9) have been determined. Tb(3+) 4f-5d transitions to the high spin (HS) and low spin (LS) states are observed (including a zero-phonon line and vibrational structure for the high spin state). The HS-LS splitting of 5400 cm(-1) is smaller than usually observed and is explained by a reduction of the 5d-4f exchange coupling parameter J by covalency. Upon replacing the smaller Lu(3+) ion with the larger Tb(3+) ion, the crystal field splitting for the lowest 5d states increases, causing the lowest 5d state to shift below the (5)D(4) state of Tb(3+) and allowing for efficient energy transfer from Tb(3+) to Ce(3+) down to the lowest temperatures. Luminescence decay measurements confirm efficient energy transfer from Tb(3+) to Ce(3+) and provide a qualitative understanding of the energy transfer process. Co-doping with Tb(3+) does not result in the desired increase in light output, and an explanation based on electron trapping in defects is discussed.

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Section: Resultsmentioning

confidence: 99%

Luminescence and Energy Transfer in Lu₃Al₅O₁₂ Scintillators Co-Doped with Ce³⁺ and Tb³⁺

Ogiegło

Zych²,

Ivanovskikh³

et al. 2012

J. Phys. Chem. A

104

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show abstract

“…Given the many interesting possible applications for LuAG, we felt it was of interest to explore new routes to single crystals of the material. It is normally grown, similar to YAG, by the classical Czochralski route, , as well as micropulling-down (μ-PD) , and vertical Bridgman methods . However, the melting point of LuAG is over 100 °C higher than YAG (2060 °C vs 1930 °C), making melt methods somewhat more problematic .…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Growth of Single Crystals of Lu₃Al₅O₁₂ (LuAG) and Its Doped Analogues

Moore

McMillen

Kolis

2013

Crystal Growth & Design

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The growth of Lu 3 Al 5 O 12 (LuAG) as high quality single crystals using the hydrothermal method is described. The growth protocol is similar to that of Y 3 Al 5 O 12 (YAG) using binary oxides (Lu 2 O 3 and sapphire) as feedstocks and 2 M K 2 CO 3 as mineralizer. The growth conditions are similar to those of YAG with a dissolution zone temperature of 640 °C and a growth zone temperature of 610 °C. To grow large crystals, commercially available YAG single crystals with (100) faces were used as surrogate seed crystals. The close lattice match allows for high quality growth of LuAG single crystals on the YAG seeds. Preparation of Lu 2 O 3 doped with a number of lanthanide ions (Nd, Tm, Er, Yb, Ho) in various concentrations is described, and use of these materials as feedstocks leads to formation of doped LuAG. Similarly, a process for the growth of single crystals of Lu 3 Al x Ga (5−x) O 12 with Ga doped in the Al site is also provided. Preliminary absorption spectroscopic data are provided for the various lanthanide doped LuAG crystals.

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“…Electron traps are situated not far below the CB. On one hand, there are indications in powder/ceramic samples of (Lu,Tb) 3 Al 5 O 12 :Ce that Tb contributes to energy migration (Batentschuk et al, 2004;Setlur et al, 2011); on the other hand, this has not been observed in bulk crystal (Zhuravleva et al, 2010). However, the bottom of the lowest Ce 5d band also shifts toward the bandgap.…”

Section: Scintillator-based Detectorsmentioning

confidence: 94%

Scintillator-Based Detectors

Eijk

2014

Comprehensive Biomedical Physics

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Crystal growth and characterization of LuAG:Ce:Tb scintillator

Cited by 12 publications

References 15 publications

Luminescence and Energy Transfer in Lu₃Al₅O₁₂ Scintillators Co-Doped with Ce³⁺ and Tb³⁺

Luminescence and Energy Transfer in Lu₃Al₅O₁₂ Scintillators Co-Doped with Ce³⁺ and Tb³⁺

Hydrothermal Growth of Single Crystals of Lu₃Al₅O₁₂ (LuAG) and Its Doped Analogues

Scintillator-Based Detectors

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Crystal growth and characterization of LuAG:Ce:Tb scintillator

Cited by 12 publications

References 15 publications

Luminescence and Energy Transfer in Lu3Al5O12 Scintillators Co-Doped with Ce3+ and Tb3+

Luminescence and Energy Transfer in Lu3Al5O12 Scintillators Co-Doped with Ce3+ and Tb3+

Hydrothermal Growth of Single Crystals of Lu3Al5O12 (LuAG) and Its Doped Analogues

Scintillator-Based Detectors

Contact Info

Product

Resources

About

Luminescence and Energy Transfer in Lu₃Al₅O₁₂ Scintillators Co-Doped with Ce³⁺ and Tb³⁺

Luminescence and Energy Transfer in Lu₃Al₅O₁₂ Scintillators Co-Doped with Ce³⁺ and Tb³⁺

Hydrothermal Growth of Single Crystals of Lu₃Al₅O₁₂ (LuAG) and Its Doped Analogues