Technology of Daylight Fluorescent Colour
Sterling Colour's Daylight Fluorescent Pigments and Inks can
appear up to three times brighter than conventional pigments.
Unlike some phosphors and other luminescent colours, both incident
and emitted radiation are in visible spectrum, they are not
dependent on UV (black) light and are not radioactive. Though
Daylight Fluorescent colours may be enhanced by UV light they
contain no inorganic phosphors (e.g. zinc sulphide) and do not
"glow in the dark". They do however appear brighter than normal
reflective colours in all daylight conditions and can be very
effective in low-light conditions.
Daylight Fluorescence occurs when higher energy, short
wavelength light is absorbed and instantaneously emitted at
wavelengths longer than those of the absorption. This is known as
Stokes Shift, defined as the separation (in nm) between the longest
wavelength absorption band and the shortest wavelength fluorescence
emission band. So, blue light is reflected as yellow or red light,
yellow light is reflected as red light and the addition of the
reflected light components can bring brightness up to three times
as that of conventional pigments where a lot of the energy is
Sterling Colour's Daylight pigments consist of a fluorescent dye
dissolved in a solid polymer matrix. The polymer matrix can be
thermoset or thermoplastic, depending on end use but in all cases
the dye is fixed within the polymer, allowing it to be used in the
manner of a traditional pigment.
Sterling Colour's liquid inks and concentrates are based on
related polymer chemistry but the very finely divided fluorescent
particles are formed within the ink medium maximizing the colour
Dyes are used singly or in combination with other dyes and
pigments to produce a range of bright colours across the spectrum.
Please see our Colour Cards for details.