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DDC: 540 × Subject: luminescence ×

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    Aero-TiO2 Prepared on the Basis of Networks of ZnO Tetrapods
    (Basel : MDPI, 2022) Ciobanu, Vladimir; Ursaki, Veaceslav V.; Lehmann, Sebastian; Braniste, Tudor; Raevschi, Simion; Zalamai, Victor V.; Monaico, Eduard V.; Colpo, Pascal; Nielsch, Kornelius; Tiginyanu, Ion M.
    In this paper, new aeromaterials are proposed on the basis of titania thin films deposited using atomic layer deposition (ALD) on a sacrificial network of ZnO microtetrapods. The technology consists of two technological steps applied after ALD, namely, thermal treatment at different temperatures and etching of the sacrificial template. Two procedures are applied for etching, one of which is wet etching in a citric acid aqua solution, while the other one is etching in a hydride vapor phase epitaxy (HVPE) system with HCl and hydrogen chemicals. The morphology, composition, and crystal structure of the produced aeromaterials are investigated depending on the temperature of annealing and the sequence of the technological steps. The performed photoluminescence analysis suggests that the developed aeromaterials are potential candidates for photocatalytic applications.
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    Thermally Activated Delayed Fluorescence in a Y3N@C80 Endohedral Fullerene: Time-Resolved Luminescence and EPR Studies
    (Weinheim : Wiley-VCH, 2017-12-8) Zalibera, Michal; Krylov, Denis S.; Karagiannis, Dimitrios; Will, Paul-Anton; Ziegs, Frank; Schiemenz, Sandra; Lubitz, Wolfgang; Reineke, Sebastian; Savitsky, Anton; Popov, Alexey A.
    The endohedral fullerene Y3N@C80 exhibits luminescence with reasonable quantum yield and extraordinary long lifetime. By variable-temperature steady-state and time-resolved luminescence spectroscopy, it is demonstrated that above 60 K the Y3N@C80 exhibits thermally activated delayed fluorescence with maximum emission at 120 K and a negligible prompt fluorescence. Below 60 K, a phosphorescence with a lifetime of 192±1 ms is observed. Spin distribution and dynamics in the triplet excited state is investigated with X- and W-band EPR and ENDOR spectroscopies and DFT computations. Finally, electroluminescence of the Y3N@C80/PFO film is demonstrated opening the possibility for red-emitting fullerene-based organic light-emitting diodes (OLEDs).