Origin of improved scintillation efficiency in (Lu,Gd)3(Ga,Al)5O12:Ce multicomponent garnets: An X-ray absorption near edge spectroscopy study | Zendy

Yuntao Wu | Zendy; Jialiang Luo | Zendy; M. Nikl | Zendy; Guohao Ren | Zendy

Open Access

Origin of improved scintillation efficiency in (Lu,Gd)3(Ga,Al)5O12:Ce multicomponent garnets: An X-ray absorption near edge spectroscopy study

Author(s) -

Yuntao Wu,

Jialiang Luo,

M. Nikl,

Guohao Ren

Publication year - 2014

Publication title -

apl materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.571

H-Index - 60

ISSN - 2166-532X

DOI - 10.1063/1.4854375

Subject(s) - cerium , materials science , valence (chemistry) , spectroscopy , analytical chemistry (journal) , absorption edge , scintillation , x ray spectroscopy , absorption (acoustics) , absorption spectroscopy , atomic physics , band gap , optics , optoelectronics , chemistry , physics , organic chemistry , chromatography , quantum mechanics , detector , metallurgy , composite material

In the recent successful improvement of scintillation efficiency in Lu3Al5O12:Ce driven by Ga3+ and Gd3+ admixture, the “band-gap engineering” and energy level positioning have been considered the valid strategies so far. This study revealed that this improvement was also associated with the cerium valence instability along with the changes of chemical composition. By utilizing X-ray absorption near edge spectroscopy technique, tuning the Ce3+/Ce4+ ratio by Ga3+ admixture was evidenced, while it was kept nearly stable with the Gd3+ admixture. Ce valence instability and Ce3+/Ce4+ ratio in multicomponent garnets can be driven by the energy separation between 4f ground state of Ce3+ and Fermi level

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