Effects of Gd/Lu ratio on the luminescence properties and garnet phase stability of Ce.sup.3+./sup. activated Gd.sub.x./sub.Lu.sub.3-x./sub.Al.sub.5./sub.O.sub.12./sub. single crystals

0499455 - FZÚ 2019 RIV NL eng J - Článek v odborném periodiku
Bartosiewicz, Karol - Babin, Vladimir - Kamada, K. - Yoshikawa, A. - Beitlerová, Alena - Nikl, Martin
Effects of Gd/Lu ratio on the luminescence properties and garnet phase stability of Ce³⁺ activated Gd_xLu_3-xAl₅O₁₂ single crystals.
Optical Materials. Roč. 80, Jun (2018), s. 98-105. ISSN 0925-3467. E-ISSN 1873-1252
Grant CEP: GA ČR GA16-15569S
Institucionální podpora: RVO:68378271
Klíčová slova: luminescence * sigle crystal
Obor OECD: Optics (including laser optics and quantum optics)
Impakt faktor: 2.687, rok: 2018

The luminescence properties of Ce3+ doped (Gd,Lu)3Al5O12 single crystals are investigated as a function of the Gd/Lu ratio with the aim of an improved understanding of the luminescence quenching, energy transfer processes and garnet phase stability. Upon heavy substitution of Lu with Gd, the target garnet phase becomes thermodynamically unstable and unwanted secondary phase inclusions arise. The thermal quenching process of the 5d→4f emission of Ce3+ in the garnet phase is determined by the temperature dependence of the photoluminescence decay time and delayed radiative recombination decays. The results show that the onset of the thermal quenching is moved to lower temperatures with increasing the Gd3+ content. The main mechanism responsible for the luminescence quenching is due to the non-radiative relaxation from 5d1 excited state to 4f ground state of Ce3+.
Trvalý link: http://hdl.handle.net/11104/0291832