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Cathodoluminescence and Raman characteristics of CaSO4:Tm3+, Cu phosphor

AuthorsEkdal, E.; García-Guinea, Javier ; Kelemen, A.; Ayvacikli, M.; Canimoglu, A.; Jorge García, Alberto ; Karali, T.; Can, N.
Rare earth
Issue Date28-Jan-2015
CitationJournal of Luminescence 161: 358-362 (2015)
AbstractThe physical characterization and phosphor emission spectra are presented for CaSO4 doped with Tm and Cu. All spectral wavelengths are related to electronic transitions of Tm3+ ions. The powder X-ray diffraction pattern showed that the compound exhibits orthorhombic structure and all reflections were indexed without any other secondary impurity phases. Chemical and structural properties of the samples have been characterized by means of Raman spectroscopy and environmental scanning electron microscope (ESEM) with an attached X-ray energy dispersive system (EDS). Group frequencies concept is essential point to the interpretation of the bands due to the main SO4 vibrational units and these displayed main characteristic intensive Raman bands including typical strong intensity at 1016 cm−1 that corresponds to ν1SO4 vibrational mode. From the spatially-resolved cathodoluminescence (CL) spectrum, main emission bands of Tm3+ centered at 346, 362, and 452 nm, due to the respective transitions of 3P0→3H4, 1D2→3H6, 1D2→3F4 were clearly identified. The study is novel as no such CL-ESEM data are available for this doped compound.
DescriptionReceived 13 October 2014, Revised 21 December 2014, Accepted 16 January 2015, Available online 28 January 2015
Publisher version (URL)http://dx.doi.org/10.1016/j.jlumin.2015.01.043
Appears in Collections:(MNCN) Artículos
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