Synthesis and Luminescence of ZnS:Er,Cu Phosphors.
ARMY ELECTRONICS COMMAND FORT MONMOUTH N J
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The effect of activator and sensitizer concentrations and firing conditions on the narrow-band luminescence output of sensitized Er-activated zinc sulfide ZnS phosphor is investigated experimentally for the purpose of optimizing the emission properties for use in various display applications. Broad-band and narrow-band luminescence is discussed in view of the energy transfer mechanism in rare-earth RE activated ZnS. The elimination of the broad-band component in ZnSEr,Cu phosphor with increasing firing time has been demonstrated. High concentrations of both, RE activator and sensitizer ions support the formation of cubic ZnS which reduces the luminescence efficiency and monochromatic character of the hexagonal ZnSEr,Cu phosphor. The temperature dependence, as well as the excitation spectrum and the build-up and decay times of the Er3 fluorescence have been investigated. A comparison of the line structure of the fluorescence bands due to the crystal field splitting of the Er3 energy levels involved in the transitions, led to the conclusion that more than one possible lattice site exists for the Er3 ion in these host lattices. Author
- Inorganic Chemistry