Luminescence in ZnS: La and ZnS: (Mn,La) phosphors |
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| Authors: | L N Tripathi C P Mishra B R Chaubey |
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| Affiliation: | (1) Department of Physics, University of Gorakhpur, 273 001 Gorakhpur, India |
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| Abstract: | The photo (PL) and electro (EL) luminescence in ZnS: MnLa and ZnS: La have been studied. The enhancement and quenching of emission bands have been observed on the simultaneous application of sinusoidal field and photons. The wave shape, voltage, frequency and temperature dependence of EL brightness have been reported. A study of the phosphorescence and thermoluminescence of these phosphors is also carried out and it is observed that the trap-depth changes slowly with temperature and activator concentration. An attempt has been made to calculate the trap depth by studying temperature dependence of EL brightness. The results are reported and discussed. |
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| Keywords: | Photoluminescence electroluminescence photoelectroluminescence thermoluminescence phosphorescence ZnS phosphor |
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