IMPROVED PULSED PHOSPHORS.
Abstract
Astudy was made of electroluminescent (EL) materials and procedures for the purpose of evaluating and improving their performance under pulsed excitation conditions. Zinc sulfide and zinc sulfoselenide powder phosphors in plastic dielectric mediums were studied under pulsed excitations in the form of sinusoidal ac bursts, rectangular dc pulses and dc bursts (groups of high frequency dc pulses). Optimum values of the integrated light output while maintaining adequate arcing strengths of the EL layers are given below for a duty cycle of 0.1%. The repetition rate was constant at 30 pulses or bursts per second. Excitation with 150 kc bursts yielded integrated light outputs of about 10 ft .L. while the maintenance (hours to one-half of initial brightness) was 1300 and 3500 hours for two different phosphors. About 5 ft.L. of integrated brightness was obtained from dc pulsed excitation and maintenance values of several thousands of hours. Measurements with dc bursts indicated 7 to 8 ft.L. as the optimum values of the output with this method of excitation. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1966
- Accession Number
- AD0629162
Entities
People
- S. A. Harper