In particular, the variants exhibit increase quantum yield of fluorescence and a single component fluorescence lifetime.

The pumping energy has a pulse duration which is less than the fluorescence lifetime of the excited solid-state media.

The fluorometry apparatus can advantageously be used for performing both direct fluorescence lifetime measurements and for performing phase fluorometry.

An extended life fluorescent polyvinyl chloride sheeting and a method for forming the sheeting are disclosed.

This luminescent body excels in thermostability and fluorescence lifetime, so that it is useful as a luminescent body for LED.

Ruby has very broad and powerful absorption bands in the visual spectrum, at 400 and 550 nm, and a very long fluorescence lifetime of 3 milliseconds.