Luminescence processes in Ti-doped LiAlO.sub.2./sub. single crystals for neutron scintillators

0491080 - FZÚ 2019 RIV NL eng J - Journal Article
Pejchal, Jan - Babin, Vladimir - Kučerková, Romana - Mihóková, Eva - Beitlerová, Alena - Kurosawa, S. - Nikl, Martin - Yoshikawa, A.
Luminescence processes in Ti-doped LiAlO₂ single crystals for neutron scintillators.
Journal of Luminescence. Roč. 201, Sep (2018), s. 231-244. ISSN 0022-2313. E-ISSN 1872-7883
R&D Projects: GA ČR GJ15-18300Y; GA MŠMT(CZ) LH14266
Institutional support: RVO:68378271
Keywords : lithium aluminate * neutron scintillator * luminescence
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 2.961, year: 2018

Ti-doped LiAlO2 shows relatively high neutron light yield comparable to that of the Li-glass standard neutron scintillator. At room temperature the Ti4+ charge transfer (CT) luminescence at 375 nm with the 2.5 μs decay time is the leading emission process. Besides the CT luminescence host emission at shorter wavelengths (350 nm), defect-related emission at 440 nm and impurity Fe3+ luminescence at 740 nm are observed. Their emission spectra, excitation spectra and decay kinetics including temperature dependences were studied. Luminescence mechanism in the material and interplay between the luminescence processes are discussed together with possible role of nonstoichiometry and Mg codoping.
Permanent Link: http://hdl.handle.net/11104/0285159