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Fluorescence luminescent pigments

Luminescent Pigments. Luminescence is the abihty of matter to emit light after it absorbs energy (see Luminescent materials). Materials that have luminescent properties are known as phosphors, or luminescent pigments. If the light emission ceases shortly after the excitation source is removed (<10 s), the process is fluorescence. The process with longer decay times is referred to as phosphorescence. [Pg.16]

Natural teeth exhibit blue-white fluorescence in the long-wavelength UV [5.435]-[5.437]. Luminescent pigments are used to imitate this phenomena in artificial teeth. They are added to the ceramic paste at a concentration of 0.3-0.5 wt%. Yttrium silicates doped with cerium, terbium, and manganese give the best results [5.438]. The excitation maximum of these phosphors is in the range 325-370 nm. The fluorescence color of the teeth can be varied by changing the concentration of activators. [Pg.261]

Luminescent pigments are solid fine particulate (1 to 5 pm) luminescent materials, which reemit absorbed energy as light at lower energy than the energy absorbed (mainly in the visible spectral region) either almost simultaneously with (fluorescence), or subsequent to (phosphorescence)... [Pg.581]

Most dyes and pigments owe their colour to the selective absorption of incident light. In some compounds, colour can also be observed as a result of the emission of visible light of specific wavelengths. These compounds are referred to as luminescent. The most commonly encountered luminescent effects are fluorescence and phosphorescence. The transitions which can occur in a molecule exhibiting either fluorescence... [Pg.21]

LUMINESCENT MATERIALS - FLUORESCENT PIGMENTS (DAYLIGHT)] (Vol 15) 7-Amino-4-methylcoumarin-3-acetic acid... [Pg.44]

Flexographic inks -cellulose nitrate m [CELLULOSE ESTERS - INORGANIC ESTERS] (Vol 5) -dispersed pigment [PIGMENT DISPERSIONS] (Vol 18) -fluorescent pigments m [LUMINESCENT MATERIALS - FLUORESCENT PIGMENTS (DAYLIGHT)] (Vol 15) -from triarylmethane dyes [T RIPHENYLMETHANE AND RELATED DYES] (Vol 24)... [Pg.406]

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See also in sourсe #XX -- [ Pg.97 ]



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