Luminescence at the axial centers of CdP2-D4 8 crystals
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BERIL, Stephan, PANASENCO, Veaceslav, TKACHENKO, D., STAMOV, Ivan, SYRBU, Nicolae. Luminescence at the axial centers of CdP2-D4 8 crystals. In: Heliyon, 2018, nr. 4(10), p. 0. ISSN 2405-8440. DOI: https://doi.org/10.1016/j.heliyon.2018.e00866
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Heliyon
Numărul 4(10) / 2018 / ISSN 2405-8440

Luminescence at the axial centers of CdP2-D4 8 crystals

DOI: https://doi.org/10.1016/j.heliyon.2018.e00866

Pag. 0-0

Beril Stephan1, Panasenco Veaceslav1, Tkachenko D.1, Stamov Ivan1, Syrbu Nicolae2
 
1 T.G. Shevchenko State University of Pridnestrovie, Tiraspol,
2 Technical University of Moldova
 
Disponibil în IBN: 4 decembrie 2018


Rezumat

Emission lines of free excitons and excitons bound to axial centers have been observed in the luminescence spectra of CdP2-D4 8 crystals doped with Mn, Sn, and Sb at 10 K. Bands models of excitons bound to axial centers (Mn, Sn, Sb) are proposed. The luminescence of crystals doped with Fe does not correspond to the axial centers band scheme. It is shown that direct transitions in excitonic band are polarized and in the case of indirect transitions they ate unpolarized. The direct band gap is due to allowed transitions Г1 → Г1 and Г2 → Г1 in E||c and E⊥c polarizations, respectively. The coefficient of the energy shift in the temperature range of 2–10 K in E‖c and Е⊥c polarizations differs (ΔE/ΔT = 3.5 meV/K, E‖c and 1 meV/K, Е⊥c).

Cuvinte-cheie
Condensed matter physics, Materials science