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  • 1
    Electronic Resource
    Electronic Resource
    The impact of ZnS fluxing on optical and physical characteristics in Ca1−xSrxS (2000)
    Springer
    Journal of materials science 19 (2000), S. 845-846 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006773028384
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation of CaS:Ce and SrS:Ce thin films by a spin-coating method and their characterization (1997)
    Springer
    Journal of materials science 16 (1997), S. 1882-1884 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018561928239
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  • 3
    Electronic Resource
    Electronic Resource
    Solid solution limits of the SrS–ZnS system (1999)
    Springer
    Journal of materials science 18 (1999), S. 1051-1052 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006679001569
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  • 4
    Electronic Resource
    Electronic Resource
    Structural characterization of luminescent Ca0.95Cd0.05S (1996)
    Springer
    Journal of materials science 7 (1996), S. 305-308 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Cadmium-doped calcium sulphide has great potential as a broadband light source in both powder and thin film electroluminescent devices. We now report the first structural investigation of polycrystalline cadmium-doped calcium sulphide using a combination of transmission electron microscopy (TEM) with microanalysis, and X-ray diffraction. We show that the crystals formed by direct reaction of CaS and CdS under excess sulphur do not yield an even distribution of cadmium. We also show that the crystals are heavily dislocated with defect structures typical of rock-salt structures. We show that TEM can be successfully applied to the study of these moisture-sensitive materials without the formation of artefacts and that TEM should be a valuable tool for studying their thin film structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00188959
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  • 5
    Electronic Resource
    Electronic Resource
    Striking selectivity of anion incorporation into polypyrrole by competitive doping: perchlorate versus hexafluorophosphate (1994)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 5 (1994), S. 586-590 
    Details
    ISSN: 1042-7147
    Keywords: Conducting polymer ; Polypyrrole ; Competitive doping ; Anion selectivity ; Perchlorate ; Hexafluorophosphate ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the electro-oxidative preparation of polypyrrole films from electrolyte media containing both perchlorate and hexafluorophosphate anions a striking selectivity towards ClO4 was observed, with a three-fold preference for this anion in films from aqueous medium and a greater than ten-fold preference from MeCN. This result is of benefit towards the production of polypyrroles containing complex functionalized dopant anions, since the presence of PF6 to bolster electrolysis parameters will less readily carry over into the final polymer. PF6 is particularly useful for this purpose in MeCN, where ClO4 is inappropriate, being itself too readily incorporated into the polymer from this solvent system.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pat.1994.220050920
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  • 6
    Electronic Resource
    Electronic Resource
    Phosphorescent spectral and decay studies of CaI - xSrxS:Ce solid solutions (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 3 (1994), S. 283-288 
    Details
    ISSN: 1057-9257
    Keywords: Phosphors ; Alkaline ; Earth sulphides ; Photoluminescence ; CaS ; SrS ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Ca1 - xSrxS Solid Solutions at 10 m/o intervals have been prepared by coprecipitation of sulphates from aqueous solution followed by reduction at 1000°C with hydrogen. Phosphorescence emission spectra have been determined for these solid solutions doped with 0.1 m/o cerium and show a blue shift with increasing strontium content from 2.46 to 2.59 eV. Hyperbolic phosphorescent decay curves were observed at both room and liquid nitrogen temperatures across the composition range and have been broken down into three exponential components by graphical and computer-programme-based methods. At room temperature trap depth values of 0.366, 0.316 and 0.282 eV with measured lifetimes of 1.9, 0.26 and 0.07 ms respectively were determined with little dependence on composition. At liquid nitrogen temperature shallower traps were observed at 0.103, 0.086 and 0.076 eV with respective decay times of 5, 0.4 and 0.09 ms having little sensitivity to changes in the host compostion. These traps are related to intrinsic defects, some of which may be surface in character. The blue shift in emission peak energy with the decrease in band gap from CaS to SrS is discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860030140
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  • 7
    Electronic Resource
    Electronic Resource
    Preparation and electroluminescence of CaS: (Ce, Eu and Cu) phosphors (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 3 (1994), S. 301-306 
    Details
    ISSN: 1057-9257
    Keywords: Calcium sulphide ; Photoluminescence ; Electroluminescence ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Doped CaS powder samples were prepared using two methods: (i) a metathesis reaction of carbonate with H2S at 1200°C; (ii) reaction with Na2Co3/S flux at 1000°C in nitrogen, followed by washing in an alkaline solution, drying and sieving to give 20-30 μm particles.Powders produced from both reactions were strongly photoluminescent and singificant AC electroluminescence (ACEL) was observed when samples produced by the metathesis reactions were copper coated. Samples prepared using the flux technique on pre-copperdoped carbonate also showed ACEL.The EL excitation process in the flux grown material differs from that in samples prepared using H2S; this stems from Cu2S microdeposits on the particle surfaces of the former. The formation of the needle-like deposit results from precipitation of copper from solid solution with decreasing temperature. The EL emission arises from observable point sources rather than the more uniform emission from copper-coated samples.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860030143
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  • 8
    Electronic Resource
    Electronic Resource
    Competitive doping in heterocyclic conducting polymers (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 6 (1996), S. 395-398 
    Details
    ISSN: 1057-9257
    Keywords: conducting polymer ; polypyrrole ; polythiophene ; polyazulene ; competitive doping ; anion selectivity ; perchlorate, hexafluorophosphate ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: The preferential incorporation of perchlorate into the polymer, from electrolyte solutions also containing hexafluorphosphate, a phenomenon previously observed during the preparation of polypyrrole, has now been shown to take place in substituted derivatives of polypyrrole, polythiophene and also in polyazulene. In these ring systems the presence of electrondonating side groups enhances the effect. Preferment of perchlorate to various degrees is seen in all systems so far studied, including a number of different solvents, and is strongest in solvents of low nucleophilicity, such as nitromethane. Polypyrrole and polythiophene from acetonitrile solutions that contain only the respective anions show a higher dopant ratio in perchlorate-containing films compared with hexafluorophosphate films, suggesting that the competitive doping effect between these anions results from preferential perchlorate compensation of cationic species produced during the polymerisation.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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