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  • 1
    Electronic Resource
    Electronic Resource
    On the luminescence of TlCl+KCl phosphor (1962)
    Springer
    The European physical journal 167 (1962), S. 20-25 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The measurements on the luminescence spectra of TlCl+KCl mixed phosphor under low energy cathode rays at 80° K have been presented here. The reflectance as well as excitation spectra of this mixed phosphors have also been studied. The X-ray diffraction studies of the samples along with the optical studies show that the mixed phosphor consists of two phases: (1) KCl:Tl (2) TlCl:K. It has been observed that the emission bands due to thallous chloride are gradually quenched with the increase in potassium chloride content of the phosphor; further, the emission bands supposed to be due to KCl:Tl phosphors gradually appear. Since some of the emission bands obtained with KCl:Tl phosphors at high thallium content are also present in the luminescence spectra of thallous chloride it is suggested that such bands should be attributed to undissociated thallous chloride present in KCl:Tl phosphor. The quenching of thallous chloride emission by the incorporation of potassium chloride in the system has been explained as being due to the absence of stoichiometric excess of thallium in such mixed system. The results also show that the absorption spectra of the mixed system is determined by the minor components KCl:Tl. This indicates that the absorption spectra of KCl:Tl phosphor should not be affected by the presence of undissociated thallous chloride.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02144648
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Energy transfer and sensitised luminescence in single crystals of CaF2:(Ce+Mn) system (1967)
    Springer
    The European physical journal 201 (1967), S. 368-377 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The measurement of absorption, luminescence, and relative intensity of cerium and manganese emission during fluorescence, on single crystals of CaF2:(Ce+Mn), have been reported in this paper. The occurence of the absorption bands have been explained in the following manner: (i) 250 mu band due to the transfer transition from F− to2D, the excited state of Ce3+, (ii) 305 mμ band due to the characteristic transition of Ce3+ and (iii) 335 mμ band due to the perturbed level of the lattice. The emission bands have been explained like this, (i) 320 and 340 mμ bands due to the transitions of2D to2F5/2,7/2 levels of Ce3+ (ii) 380 and 440 mμ bands corresponding to the perturbed levels and (iii) 520 mμ band due to transfer of energy from cerium centres to manganese centres. The results of the present investigation indicate that energy transfer in this system occures not only from cerium to manganese centres but also from cerium to cerium and cerium to perturbed levels of the lattice. It has also been observed that energy transfer process is temperature dependent in this case. An energy level scheme is proposed to explain the transfer mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01326570
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Absorption and emission spectra of Tl1+ with mixture of oxide and chloride ligands in glasses (1973)
    Springer
    Journal of materials science 8 (1973), S. 1110-1114 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Absorption and emission spectra of Tl1+ in a series of (16−x)R2O, 2x RCl, 84B2O3 glasses (where R refers to Na or K, andx varies from 0 to 4 mole) have been studied; and the results compared with those of Tl1+ in exclusively oxide and exclusively chloride co-ordinated polyhedra in crystalline phosphors. Both absorption and emission spectra of Tl1+ in chloride containing glasses gave strong evidence for complexes of the type: [Tl(oxide)6−n (chloride) n ] m−.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00632761
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Absorption and emission spectra of thallium activated Na2O-NaCl-B2O3 and K2O-KCl-B2O3 glasses (1974)
    Springer
    Journal of materials science 9 (1974), S. 1493-1498 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Absorption and emission spectra of two Na2O-NaCl-B2O3 and two K2O-KCl-B2O3 glasses, with large thallium concentrations (about 0.01 mol thallium per litre glass) have been studied. Absorption bands have been observed at 49 000, 44 500 and 40 000 cm−1 for the Na2O-NaCl-B2O3 glasses, and at 49 000, 43 500 and 38 500 cm−1 for the K2O-KCl-B2O3 glasses at 300 K. Emission spectra have been recorded at 83, 308, 445 and 485 K; generally two emission bands have been observed in the ultraviolet region, and the intensity of both bands increased with decreasing temperature. The absorption and emission bands have been assigned to electronic transitions in different centres formed by Tl+ ions in glass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00552935
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    Paper (German National Licenses)
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