UV and gamma-ray excited luminescence of cerium-doped rare-earth oxyorthosilicates

Suzuki, Hideo; Tombrello, T. A.; Melcher, Charles L.; Schweitzer, J.S.

doi:10.1016/0168-9002(92)90784-2

Cited by 253 publications

(87 citation statements)

References 14 publications

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“…The emission intensity of cerium-doped lutetium oxyorthosilicate has been reported to reach up to 75% of that of the standard scintillator material ΝaΙ(T1), and emits efliciently under a variety of excitation energies (UV, X-and γ-rays) [5]. Our absorption and excitation spectra agree with published results and display several distinct bands which have been assigned to 4f-5d transitions of Ce3 + (solid line in Fig.…”

Section: Optical Spectroscopysupporting

confidence: 81%

“…We compare these results to those obtained on cerium-doped lutetium oxyorthosilicate, a very efficient and promising scintillator material [5,6]. These two lutetium-based materials were chosen because they represent extreme cases of the quantum efficiency in Ce3+ doped systems.…”

Section: Introduttionmentioning

confidence: 92%

“…The stable type of structure for the rare earths of smaller ionic radii (as well as Y) has monoclinic C h s ymmetry (C2/c) with two different cationic sites of coordination numbers 6 and 7 [16]. Two independent luminescence centers in these sites have been observed and described by Melcher et al [5].…”

Section: Sample Preparationmentioning

confidence: 99%

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Luminescence and Photoconductivity of Cerium Compounds

et al. 1996

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The study of the luminescence properties of rare earth doped systems historically focuses on systems which exhibit strong luminescence. More recently, extensive studies on materials with high quantum effrciency are in part motivated b y the search for new plosplor and scintillator materials. However, a thorough study of certain systems which show very low quantum yield will certainly lead to a better understanding of phosphor materials and rare earth systems in general. As an example of recent studies which address both the fundamental question of relaxation processes in rare earth doped systems and phosphor applications we present studies on cerium-doped lutetium oxide crystals which are characterized by a compJete quenching of the 5d-4f luminnescence and compare its optical properties to that of very efficient cerium doped phosphor material, lutetium oxyorthosilicate. To find the mechanisms which lead to the different quantum efficiency in these systems, extensive absorption, photoexcitation and photoconductivity studies were performed on singłe crystals. We demonstrate that the radically different emission properties of the investigated systems originate in smaJl but crucial differences in the location of the emitting 5d level of the cerium ion with respect to the conduction band of the host -a general result which can be applied to a broad range of materials.PACS numbers: 72.40.-+, 78.50.Ec, 78.55.Hx IntroduttionMaterials doped with Ce3 + have attracted the interest of solid state researchers since the early sixties, and most papers focus on the application of these materials as phosphors or scintillators [1]. Despite of more than 30 years of research, one crucial question has not been fully answered: i.e., why do seemingly similar Ce-doped systems show drastically different luminescence properties, ranging from quantum efficiencies of nearly 100% to systems where the luminescence is completely quenched.High quantum efficiencies can be understood easily in terms of the electronic structure of trivalent cerium: the simple electron configuration 4f 1 leads (257)

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Section: Optical Spectroscopysupporting

confidence: 81%

Section: Introduttionmentioning

confidence: 92%

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Luminescence and Photoconductivity of Cerium Compounds

et al. 1996

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“…The Gd( ) coordinated with 9 oxygen is bonded with one isolated oxygen and six tetrahedral [SiO 4− ] ions. As shown in Table 2, the average distance of 2.39 Å in Gd( )-O is shorter than that of 2.49 Å in Gd( )-O (Felsche, 1973) The symmetry and intensity of crystal field would be affected by the coordination field after doping with active Rare Earth ions into the host (Suzuki et al, 1992;Cooke et al, 2000). …”

Section: Gd 2 Siomentioning

confidence: 99%

Growth and Characterization of Ytterbium Doped Silicate Crystals for Ultra-Fast Laser Applications

Zheng¹,

Su²,

Xu³

2012

Modern Aspects of Bulk Crystal and Thin Film Preparation

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“…Scintillation properties of the Ce-doped rare-earth orthosilicates were mentioned for the first time in early 1980s in the study dealing with the Gd 2 SiO 5 :Ce (GSO) (Takagi et al, 1983). Following studies concerned mainly Lu 2 SiO 5 :Ce (LSO) (Suzuki et al, 1992) and mixed Lu 2-203 x Y x SiO 5 :Ce (LYSO) (Cooke et al, 2000) which became materials of choice for PET imaging in medicine. Single crystals of these orthosilicate materials were prepared by the Czochralski method using radio-frequency (RF) heating due to very high melting point of these compounds (between ~1950-2150 0 C) (Melcher et al, 1993).…”

Section: Introductionmentioning

confidence: 99%