Browsing by Author "Babeva, T."

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Atomic layer deposition prepared Al-doped ZnO for liquid crystal displays applications
(2018-05-01)
Su, Y. C.
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Chiou, C. C.
;
Marinova, V.
;
Lin, S. H.
;
Bozhinov, N.
Aluminum-doped zinc oxide (AZO) layers are prepared by using atomic layer deposition technique. The obtained layers possess high optical transmittance at visible and near-infrared spectral range. By varying the Al content, optimal growth compositions of AZO are established where the electrical conductivity of the film is highest. Based on performed optical and electrical characteristics measurements, selected AZO films with optimal conductivity are implemented as transparent electrodes in liquid crystal display devices. The electro-optical modulation characteristics of these devices are found to be comparable to those of devices using commercial ITO electrodes.
Structural and optical properties of LuVO4 single crystals
(2017-01-01)
Dimitrov, D.
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Rafailov, P.
;
Marinova, V.
;
Babeva, T.
;
Goovaerts, E.
The synthesis of large single crystals with good optical quality which is a preliminary condition for the practical applications of these materials frequently is complicated. It is found that large LuVO4 single crystals with high optical quality are possible to be prepared using high temperature solution growth method. It is obtained by X-ray crystallographic analysis that the grown crystals possess centrosymmetric tetragonal structure with the point group symmetry D-4h and space group I41/amd (zircon-type structure). The unit cell parameters of a = 7.0236 angstrom, b = 7.0236 angstrom, c = 6.2293 angstrom, volume = 307.30(3) angstrom(3) are measured. The crystals composition as well as vanadium oxidation state were measured in order to confirm that the crystal phase is mainly LuVO4. Optical transmission and Raman Spectroscopy are further performed on LuVO4 single crystal to reveal the optical quality and structure details