Alkaline Earth Sulfide Phosphors Activated by Copper, Silver, and Gold
01 Nov 1970-Journal of The Electrochemical Society (The Electrochemical Society)-Vol. 117, Iss: 11, pp 1389-1393
TL;DR: In this article, the emission spectra of cathodoluminescence of Cu, Ag, and Au in,,, and, at room temperature and near 80°K, are presented.
Abstract: Emission spectra of cathodoluminescence of Cu, Ag, and Au in , , , and , at room temperature and near 80°K, are presented. The spectra depend very much on the coactivators used including the alkalies and the halides. The observations indicate the luminescence to be caused by centers containing both activator and coactivator.
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TL;DR: Spectroscopic properties of pure and impurity-activated alkaline-earth sulfides as studied by optical and magnetic resonance techniques are reviewed in this paper, where the authors propose a spectral model of the sulfide.
165 citations
TL;DR: In this paper, an experimental investigation on CaS phosphors revealed 31 different activators each producing its own emission characteristics, and the choice of the best co-activator is not always governed by the rules of charge compensation, the latter principle appearing to be violated in many cases.
156 citations
TL;DR: A review of the material preparation and thermoluminescence (TL) of alkaline earth sulphide phosphors is presented in this article, where the effects of impurities, flux, grain size, etc. on the TL of these materials are reported.
Abstract: The present article offers a review of the material preparation and thermoluminescence (TL) of alkaline earth sulphide phosphors. Different methods of material preparation and characterization of alkaline earth sulphides in the form of polycrystalline powders, films, single crystals and pellets are described. In the process of impurity doping, the role of flux is explained. The general theory of TL and the different methods used to calculate the trapping parameters (E and s) from the TL glow curves are presented. The effects of impurities, flux, grain size, preparative parameters etc. on the TL of these materials are reported. The types of traps and trapping parameters obtained by various workers are given. Considering the results presented by various authors, possible impurity complexes are proposed. The potential applications of these phosphors in TL and OSL dosimetry, cathode ray tubes, electroluminescence panels and infrared sensors are briefly discussed.
86 citations
TL;DR: In this paper, the afterglow emission of CaS:Eu 2+, Tm 3+, Ce 3+ and Na + codoped samples were investigated using a solid state chemical reaction method.
Abstract: CaS:Eu 2+ , CaS:Ce 3+ , Na + , CaS:Eu 2+ , Ce 3+ , CaS:Eu 2+ , Tm 3+ , and CaS:Eu 2+ , Ce 3+ , Tm 3+ phosphors samples were prepared using a solid state chemical reaction method. Emission and excitation spectra of CaS:Eu 2+ (peak emission observed at 648 nm) and CaS:Ce 3+ (peak emission observed at 515 nm) were investigated. Neither Eu 2+ singly doped sample nor Ce 3+ and Na + codoped sample had a long afterglow. CaS:Eu 2+ , Ce 3+ showed some afterglow with a short persistence. By incorporation of Ce 3+ , an efficient energy transfer from Ce 3+ to Eu 2+ was found at a low doping concentration 0.1%. Emission intensity of Eu 2+ was enhanced by 20%. Enhancement of long persistence of Eu 2+ afterglow emission was achieved by co-doping Ce 3+ in CaS:Eu 2+ , Tm 3+ as a durable sensitizer. For the triply doped CaS:Eu 2+ , Tm 3+ , Ce 3+ it was found that the persistence time was 22% longer than that of CaS:Eu 2+ , Tm 3+ .
54 citations
TL;DR: The concept of dual-excitation dual-emission (DE2) phosphors for the enhancement of solar energy conversion is introduced in this article, where Doping alkaline earth cations as an aggregated energy trap is used.
Abstract: The concept of dual-excitation dual-emission (DE2) phosphors for the enhancement of solar energy conversion is introduced in this work. Doping alkaline earth cations as an aggregated energy trap wi...
49 citations