Cathodoluminescence and green-thermoluminescence response of CaSO4:Dy,P films

• Published in: Journal of luminescence Vol. 135; pp. 89 - 92
• Main Authors: Roman-Lopez, J., Correcher, V., Garcia-Guinea, J., Rivera, T., Lozano, I.B.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-03-2013
• Subjects: Band spectra; Bands; CaSO4:Dy; Cathodoluminescence; Deposition; Electronics; Emission spectroscopy; Green-thermoluminescence; Luminescence; P films; Spectral emissivity; Spray pyrolysis; CaSO4:Dy; P films; Spray pyrolysis; Green-thermoluminescence; Cathodoluminescence
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2012.10.020

We herein report on the cathodoluminescence (CL) and green-thermoluminescence (TL) emission of CaSO4:Dy,P films deposited by the spray pyrolysis method at different temperatures. The samples have been previously structurally and chemically characterized by means of Raman spectroscopy and energy dispersive spectroscopy (EDS). The CL spectra show (i) a broad emission band centered at 374nm that corresponds to the intrinsic emission of (SO4)2− and (ii) emission bands centered on 486, 574, 668, 758nm assigned to the electronic transitions of the Dy3+ ions. The TL glow curves of the films showed three groups of components peaked at around of 98, 152 and 300°C that exhibit a gradual and progressively linear shifting of the Tmax as function of Tstop. This TL behavior is related to a continuum in the trap distribution associated with general or multi-order kinetics and involving continuous processes of trapping–detrapping. The activation energy in the range of 0.97–1.53eV has been estimated using the initial rise method.
► The CaSO4:Dy,P films were prepared by using the ultrasonic spray pyrolysis method. ► Luminescence spectra of the CaSO4:Dy,P films display the emission bands of the ions (SO4)2− and Dy3+. ► The CaSO4:Dy,P films were irradiated with a 90Sr/90Y beta source. ► The TL intensity of the films depends on the temperature of deposit.