Patent ID: 7674532

Claim:
A film comprising either i) or ii): i) a polymer layer containing a luminescent component therein, which luminescent component comprises a fluorescent substance and a phosphorescent substance, or comprises a mixture of at least one fluorescent substance and at least one phosphorescent substance, and which luminescent component luminesces upon the application of ultraviolet radiation in the 200 nm to 300 nm range onto the luminescent component; which polymer layer has a transparency to ultraviolet radiation in the 200 nm to 300 nm range in an amount of about 10% or more; ii) a) a polymer layer, which polymer layer has a transparency to ultraviolet radiation in the 200 nm to 300 nm range in an amount of about 10% or more; and b) a luminescent component on the polymer layer, which luminescent component comprises a fluorescent substance and a phosphorescent substance, or comprises a mixture of at least one fluorescent substance and at least one phosphorescent substance and which luminescent component luminesces upon the application of ultraviolet radiation in the 200 nm to 300 nm range onto the luminescent component.