ZINC SULPHIDE PHOSPHOR HAVING PHOTO- AND ELECTROLUMINESCENT PROPERTIES PROCESS FOR PRODUCING SAME AND SECURITY DOCUMENT SECURITY FEATURE AND METHOD FOR DETECTING SAME

摘要

The present invention relates to a zinc sulfide phosphor and a method for manufacturing the same. The present invention also relates to a secure document or security, a security feature and a method for detecting the same. The phosphors according to the invention are electroluminescent phosphors which can be excited by an electric field, thereby emitting electroluminescence in the blue and/or green range of the light spectrum. The phosphor may also be excited by UV radiation in the wavelength range of 345 nm to 370 nm, thereby emitting photoluminescence in the blue range of the light spectrum. The phosphor can also be excited by UV radiation in the wavelength range of 310 nm to 335 nm, so that photoluminescence in the green range of the light spectrum can be emitted.