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384 results on '"Zych, E."'

101. Ce3+ luminescence quenching in Sr-rich SrHfO3 micro-powders.

Author

Lauria, A, Fasoli, M, Jary, V, Kucerkova, R, Mihokova, E, Moretti, F, Nale, A, Trjan Piegza, J, Zych, E, Nikl, M, Vedda, A, LAURIA, ALESSANDRO, FASOLI, MAURO, MORETTI, FEDERICO, NALE, ANGELOCLAUDIO, VEDDA, ANNA GRAZIELLA, Lauria, A, Fasoli, M, Jary, V, Kucerkova, R, Mihokova, E, Moretti, F, Nale, A, Trjan Piegza, J, Zych, E, Nikl, M, Vedda, A, LAURIA, ALESSANDRO, FASOLI, MAURO, MORETTI, FEDERICO, NALE, ANGELOCLAUDIO, and VEDDA, ANNA GRAZIELLA

Published
2011

116. Quantum efficiency of europium emission from nanocrystalline powders of Lu2O3:E

Author

Chemie van de vaste stof: Luminescentie en elektrochemie, Condensed Matter and Interfaces 1, Dep Scheikunde, Zych, E., Meijerink, A., de Mello Donega, C., Chemie van de vaste stof: Luminescentie en elektrochemie, Condensed Matter and Interfaces 1, Dep Scheikunde, Zych, E., Meijerink, A., and de Mello Donega, C.

Published
2003

144. Effect of charge compensation on up-conversion and UV excited luminescence of Eu3+ in Yb3+–Eu3+ doped calcium aluminate CaAl4O7.

Author

Puchalska, M., Zych, E., Sobczyk, M., Watras, A., and Deren, P.

Subjects
*PHOTON upconversion, *ULTRAVIOLET radiation, *LUMINESCENCE, *EUROPIUM compounds, *CALCIUM aluminate, *SEMICONDUCTOR doping, *ACTIVATORS (Chemistry)
Abstract

Abstract: Calcium aluminate powders co-doped with Yb3+ and Eu3+: Ca1−x−y Yb x Eu y Al4O7 (x = 0.02–0.06; y = 0.02), Ca1−x−y Yb x Eu y Al4O7 (x = 0.05, y = 0.01–0.07) were synthesized by a modified Pechini citrate process and their optical properties at 298 K and 77 K were investigated. Direct excitation of Yb3+ by means of 2F7/2 → 2F5/2 absorption at 980 nm leads to bluish-green luminescence centered around 488 nm due to the cooperative emission of Yb3+ and red emission of Eu3+ corresponding to 5D0 → 7F J (J = 0–4) transitions. The near-infrared to red up-conversion luminescence of Eu3+ was assigned to a cooperative sensitization mechanism. The effect of activators concentration and charge compensation by co-doping with Na+ ions on luminescence properties were studied in detail. Na+ addition led to narrowing of luminescence bands, suggesting smaller disturbance/distribution of activator ions local symmetries. This was associated with significantly enhanced luminescence brightness of Eu3+ under UV excitation and, surprisingly, with noticeably reduced efficiency of Eu UC emission upon near-infrared excitation. It was also concluded that Yb3+ pairs transfer preferentially their excitation energy to Eu3+ ions with the local symmetry perturbed by certain defects present in the crystal lattice. [Copyright &y& Elsevier]

Published
2014
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