IMPROVED ELECTROLUMINESCENT LAYERS
Abstract
Plastic-embedded phosphor powder and thin phosphor films were studied with the objective of improving the operating characteristics of electroluminescent layers at high and at low excitation voltage. Green-emitting EL layers were prepared which display 100 ft-L initial brightness with an operation time to one-half initial brightness (half-life) of 1100 hours. Whiteemitting EL layers containing plastic-embedded phosphor blends were prepared which display initial brightnesses between 40 and 100 ft-L and a half-life of 400 to only a few hours respectively. However, white-emitting EL layers composed of a field responsive phosphor, emitting in the green-blue, and a red photoluminescent phosphor (i.e., a cascade system) were developed which yield initial brightnesses between 70 and 77 ft-L and a half-life of about 1100 hours. Red-emitting EL layers were prepared which conform to N.B.S. specifications on ''aviation red'' with an initial brightness of about 11.0 ft-L and a half-life of about 400 hours. Thin phosphor film EL layers were developed which yield up to 20 ft-L initial brightness at 15 volts, rms, 400 cps. The operating lifetime of these low voltage EL layers remains relatively short. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1962
- Accession Number
- AD0291606
Entities
People
- R.w. Wollentin
Organizations
- Rome Laboratory