Luminescence and charge trapping in Cs.sub.2./sub.HfCl.sub.6./sub. single crystals: optical and magnetic resonance spectroscopy study

0476804 - FZÚ 2018 RIV US eng J - Journal Article
Král, Robert - Babin, Vladimir - Mihóková, Eva - Buryi, Maksym - Laguta, Valentyn - Nitsch, Karel - Nikl, Martin
Luminescence and charge trapping in Cs₂HfCl₆ single crystals: optical and magnetic resonance spectroscopy study.
Journal of Physical Chemistry C. Roč. 121, č. 22 (2017), s. 12375-12382. ISSN 1932-7447. E-ISSN 1932-7455
R&D Projects: GA MŠMT LO1409; GA ČR GA17-09933S
Institutional support: RVO:68378271
Keywords : Cs2HfCl6 * single crystal * luminescence * temperature dependence * EPR spectroscopy
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 4.484, year: 2017

Photoluminescence spectra and decays were measured in the extended temperature range of 8-500 K and approximated by a phenomenological model. Self-trapped exciton and defect-related emissions were clearly distinguished with the onset of thermal quenching, above the room temperature. Electron paramagnetic resonance experiment revealed the formation of two configurations of V-k center (Cl-2(-) molecular ion) at low temperatures. One of the V-k centers is created by a hole self-trapping at two neighboring Cl ions. In the temperature range 70-80 K, this state is thermally disintegrated and reappears in another configuration formed most probably by an interstitial Cl ion.
Permanent Link: http://hdl.handle.net/11104/0273220