Journal Article

PUBDB-2019-00217

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A luminescence-optical spectroscopy study of $\mathrm{Rb_{2}KTiOF_{5}}$ single crystals

Pustovarov, V.Extern* ; Ogorodnikov, I. (Corresponding author)Extern* ; Kozlov, A. ; Isaenko, L. I.

2018
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.optmat.2018.04.027  doi:10.3204/PUBDB-2019-00217

Abstract: Large single crystals of Rb$_2$KTiOF$_5$ (RKTF), grown by slow solidification method, were studied (7–400 K) for various types of optical and radiation effects. The optical absorption spectra, the parameters of the Urbach rule at 293 K (σ = 0.24 and  = $E_U$105 meV), the low-temperature reflection spectra (T = 7 K, E = 3.7–22 eV) were determined. The luminescence spectra (1.2–6.2 eV) and luminescence decay kinetics are studied upon excitation by a nanosecond electron beam (PCL), ultraviolet and vacuum ultraviolet light (PL), or X-rays radiation (XRL). PL excitation spectra under selective photoexcitation by synchrotron radiation (E = 3.7–22 eV, T = 7 K), temperature dependences of the intensity of steady-state XRL in different emission bands, as well as thermoluminescence (7–400 K) are studied. In the visible spectral region, we detected three luminescence bands that were attributed to radiative annihilation of intrinsic excitons (2.25 eV), recombination-type luminescence (2.1 eV) and luminescence of higher TiOF$_5$ complexes (1.9 eV). The exponential component with lifetime of about 19 μs was revealed in the PCL decay kinetics at 2.25 eV. The low-energy onset of the intrinsic host absorption  $E_c$= 3.55 eV was determined on the basis of the experimental data obtained. Spectra of optical constants were calculated by the Kramers-Krönig method, the energy of the onset of the interband transitions  $E_g$= 4.2 eV was determined, and the main peaks of the optical spectra were identified.

Note: © Elsevier B.V.

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Contributing Institute(s):

1. DOOR-User (DOOR)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)
2. FS-Proposal: I-20110050 (I-20110050) (I-20110050)
3. FS-Proposal: I-20110841 (I-20110841) (I-20110841)

Experiment(s):

1. DORIS Beamline I (DORIS III)

Appears in the scientific report 2018

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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