Trap filling by field excitation of electroluminescent centers in zinc sulfide phophors (in German)
Traps of electroluminescent ZnS phosphors can be filled by field excitation at low temperatures as was indicated by thermoluminescence. Shape and light sum of the resulting glow curves were similar to those produced after very feeble uv excitation. Regarding the same luminance of the phosphor the efficiency of the trap filling by field excitation was found to be only a small fraction of that by uv excitation. The time dependence of field induced trap filling can be expressed by an exponential law. The voltage as well as the frequency dependence of the trap filling differed from that of the luminescence intensity. The results can be explained by the fact that electroluminescence excitation only occurs in small parts of the crystallites. It is supposed that the saturation of trap filling in these areas is achieved within a short time whereas trap filling in the bulk is performed by a slow diffusion process.
- Research Organization:
- Physikalisch-Technischen Bundesanstalt, Berlin
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-17-037882
- OSTI ID:
- 4629937
- Journal Information:
- European Physical Journal. A, Journal Name: European Physical Journal. A Journal Issue: 3 Vol. 175; ISSN 1434-6001
- Publisher:
- Springer
- Country of Publication:
- Country unknown/Code not available
- Language:
- German
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