Hot-electron impact excitation of ZnS:Tb alternating-current thin-film electroluminescent devices
A new method of performing hot-electron impact excitation experiments using alternating-current thin-film electroluminescent (ACTFEL) devices is reported. This method relies on the use of a field-control circuit to control the magnitude of the phosphor field and consists of plotting the intensity of...
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Veröffentlicht in: | Journal of applied physics 1995-08, Vol.78 (3), p.2101-2104 |
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Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
Online-Zugang: | Volltext |
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Zusammenfassung: | A new method of performing hot-electron impact excitation experiments using alternating-current thin-film electroluminescent (ACTFEL) devices is reported. This method relies on the use of a field-control circuit to control the magnitude of the phosphor field and consists of plotting the intensity of a given electroluminescence transition, normalized by the amount of conduction charge which flows while the field-control circuit is asserted (the electroluminescence intensity of a given transition divided by the conduction charge is denoted the impact excitation quantum yield ηie), as a function of the phosphor field Fp. ηie vs Fp is measured for ZnS:Tb ACTFEL devices fabricated by atomic layer epitaxy (ALE) and by sputtering. ηie exhibits a threshold at approximately 0.5 MV/cm and saturation at approximately 1.5 MV/cm. The magnitude of ηie for the ALE ACTFEL device depends strongly on temperature; in contrast, ηie for the sputtered ACTFEL device is virtually temperature independent. |
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ISSN: | 0021-8979 1089-7550 |
DOI: | 10.1063/1.360188 |