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Comparison of LGSO:Ce scintillator crystals grown by micro-PD and Czochralski methods

Valerii Kononets 1,2Kheirreddine Lebbou 2Oleg Sidletskiy 1

1. Institute for scintillation materials of NAS of Ukraine (ISMA), 60 Lenin ave., Kharkov 61001, Ukraine
2. Universite de Lyon, CNRS, Institut Lumiere Matiere, Villeurbanne 69622, France

Ce-doped crystals based on complex oxides are known as fast, dense, and bright sicntillators. Recently, a set of new mixed crystals were developed with improved light yield and energy resolution [1, 2]. LuxGd1−xSiO5:Ce (LGSO:Ce) is one of them. It is formed as the result of Lu/Gd cation substitution and form lattices of two types of monoclinic space symmetry. Scintillation characteristics of P21/c lattice LGSO:Ce are moderate, at the same time, crystals with C2/c structure possess a very attractive combination of characteristics for PET, introscopy, high energy physics.

The present report is devoted to growth of bulk crystals and fibers by Czochralski (Cz) and micro-pulling down (µ-PD) methods. LGSO:Ce fibers by µ-PD were obtained for the first time. µ-PD is an efficient method for prompt screening of crystal compositions. Besides this, fibers are promising for utilization in pixelated detectors without multistage procedure of crystal machining. Optimal ratio of substituted cations and activator concentration in LGSO:Ce was determined by Cz and µ-PD. Relative population of Lu3+ and Gd3+ in 7-fold and 6-fold cation positions not differs substantially in crystals grown by different methods. luminescence spectrum of LGSO:Ce consists of subbands associated with CeO7 and CeO6 polyhedra. Similar shapes of luminescence spectra of Cz and µ-PD grown crystals certifies no substantial difference in activator distribution between these sites.

The work is partially supported by the project No. 28317ZC in the framework of DNIPRO scientific collaboration between Ukraine and France.

corresponding author e-mail: [email protected]

1. M. Fasoli, A.Vedda, M. Nikl et al. Phys. Rev., B 84, 081102(R) (2011).
2. O. Sidletskiy, A. Belsky, A. Gektin et al., Crystal Growth & Design 12, 4411 (2012).


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Related papers

Presentation: Poster at 17th International Conference on Crystal Growth and Epitaxy - ICCGE-17, General Session 5, by Valerii Kononets
See On-line Journal of 17th International Conference on Crystal Growth and Epitaxy - ICCGE-17

Submitted: 2013-03-31 16:55
Revised:   2013-03-31 17:42