Luminescence and scintillation characteristics of (Gd.sub.x./sub.Y.sub.3-x./sub.)Al.sub.2./sub.Ga.sub.3./sub.O.sub.12./sub.:Ce (x=1,2,3) single crystals

0501246 - FZÚ 2019 RIV NL eng J - Článek v odborném periodiku
Chewpraditkul, Wa. - Pattanaboonmee, N. - Sakthong, O. - Chewpraditkul, W. - Szczesniak, T. - Moszynski, M. - Kamada, K. - Yoshikawa, A. - Nikl, Martin
Luminescence and scintillation characteristics of (Gd_xY_3-x)Al₂Ga₃O₁₂:Ce (x=1,2,3) single crystals.
Optical Materials. Roč. 76, Feb (2018), s. 162-168. ISSN 0925-3467. E-ISSN 1873-1252
Grant CEP: GA ČR GA16-15569S
GRANT EU: European Commission(XE) 644260 - INTELUM
Grant ostatní: AV ČR(CZ) JSPS-17-18
Program: Bilaterální spolupráce
Institucionální podpora: RVO:68378271
Klíčová slova: (Gd,Y)3Al₂Ga₃O₁₂:Ce * energy resolution * luminescence * scintillation decay * time resolution
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 2.687, rok: 2018

The luminescence and scintillation characteristics of Czochralski-grown (GdxY3-x)Al2Ga3O12:Ce (x = 1,2,3) single crystals are presented. With increasing Gd content in this garnet host, the 5d2 absorption band was blue-shifted while the 5d1 absorption and 5d1 / 4f emission bands were red-shifted due to an increase in the crystal field splitting of the 5d levels. In addition, the luminescence quenching temperature of the Ce3+ emission and activation energy for thermal quenching decreased with increasing Gd content. The Gd3+ / Ce3+ energy transfer was evidenced by photoluminescence excitation spectra of Ce3+ emission. At 662 keV g - rays, the light yield (LY) of 48,600 ph/MeV and energy resolution of 6.5% was measured for a Gd3Al2Ga3O12:Ce crystal. Scintillation decay measurements were performed using the time-correlated single photon counting technique. Superior time resolution of Gd3Al2Ga3O12:Ce is due to its high LY and fast scintillation response.

Trvalý link: http://hdl.handle.net/11104/0293238