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https://repositorio.ufrn.br/handle/123456789/32291| Título: | Photoluminescence properties of BaMoO4 amorphous thin films |
| Autor(es): | Marques, Ana Paula Azevedo Melo, Dulce Maria de Araújo Silva, Elson Longo da Paskocimas, Carlos Alberto Pizani, Paulo Sérgio Leite, Edson Roberto |
| Palavras-chave: | BaMoO4;Photoluminescence;Thin films;Polymeric precursor method;Amorphous |
| Data do documento: | Jul-2005 |
| Editor: | Elsevier |
| Referência: | MARQUES, Ana Paula Azevedo; MELO, Dulce M.A. de; LONGO, Elson; PASKOCIMAS, Carlos A.; PIZANI, Paulo S.; LEITE, Edson R.. Photoluminescence properties of BaMoO4 amorphous thin films. Journal Of Solid State Chemistry, [S.L.], v. 178, n. 7, p. 2346-2353, jul. 2005. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S002245960500229X?via%3Dihub. Acesso em: 20 mar. 2021. http://dx.doi.org/10.1016/j.jssc.2005.05.024. |
| Resumo: | BaMoO4 amorphous and crystalline thin films were prepared from polymeric precursors. The BaMoO4 was deposited onto Si wafers by means of the spinning technique. The structure and optical properties of the resulting films were characterized by FTIR reflectance spectra, X-ray diffraction (XRD), atomic force microscopy (AFM) and optical reflectance. The bond Mo–O present in BaMoO4 was confirmed by FTIR reflectance spectra. XRD characterization showed that thin films heat-treated at 600 and 200 1C presented the scheelite-type crystalline phase and amorphous, respectively. AFM analyses showed a considerable variation in surface morphology by comparing samples heat-treated at 200 and 600 1C. The reflectivity spectra showed two bands, positioned at 3.38 and 4.37 eV that were attributed to the excitonic state of Ba2+ and electronic transitions within MoO24 , respectively. The optical band gaps of BaMoO4 were 3.38 and 2.19 eV, for crystalline (600 1C/2 h) and amorphous (200 1C/8 h) films, respectively. The room-temperature luminescence spectra revealed an intense single-emission band in the visible region. The PL intensity of these materials was increased upon heat-treatment. The excellent optical properties observed for BaMoO4 amorphous thin films suggested that this material is a highly promising candidate for photoluminescent applications |
| URI: | https://repositorio.ufrn.br/handle/123456789/32291 |
| ISSN: | 10.1016/j.jssc.2005.05.024 0022-4596 |
| Aparece nas coleções: | CT - DEMAT - Artigos publicados em periódicos |
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