THIN FILM RESEARCH.
Abstract
Small crossed grid arrays of electroluminescent cells having a resolution of 33 lines/in. were made by a vacuum deposition method. The phosphor was ZnS:Mn. A thick, low conductivity layer of GeO2 was included in most of the devices. Background cross-talk was negligible because of the high suppression ratio characteristic of the phosphor used. Current-voltage measurements were made for films ranging from a few hundred up to some 50,000 angstroms thick. In addition to the ac electroluminescence reported earlier, dc electroluminescence at high applied voltages was observed with either polarity of the applied voltage, both in cells with and without a supplementary film of GeO2. The emission was greater when the GeO2 film was included and when the aluminum electrode was the cathode. Although the quantitative measurements were made at room temperature, both ac and dc electroluminescence were also observed at 77 K. Tunnelling through thin organic films was investigated on an exploratory basis. The particular organic compound was fluorescein, selected for its molecular dipole and suitability for film formation by vacuum deposition. The films were deposited either under the influence or in the absence of a prepolarizing field. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 04, 1963
- Accession Number
- AD0437866
Entities
People
- Edwin J. Soxman
- Gordon N. Steele