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WAVELENGTH SHIFTING PAINT

EJ-298, EJ-298G

 

EJ-298

 

EJ-298 is a blue-emitting wavelength shifting paint, and EJ-298G is a green emitting wavelength shifting paint. These paints consist of a polyvinyltoluene (PVT) binder and fluorescent dopants dissolved in a xylene solvent. Each paint is nominally 20% solids by weight, and one liter will cover approximately 0.33 square meters with a film 50 μm (0.002 inch) thick.

EJ-298 and EJ-298G may be applied to clean glass plates by brushing or by a draw-bar technique to produce a clear film. Adhesion is best when the painted substrate is well cleaned so as to be free of any invisible residues. The paint should be applied at room temperature or at a slightly elevated temperature for best results. Multiple coats may be applied, but each successive coat should be kept thin in order to avoid softening of the dried layers beneath. The paint is potentially flammable and poses a mild inhalation hazard, and therefore it should be handled in a well ventilated working place and with care to the hazard potential. Application equipment may be cleaned with most general-purpose commercial paint thinner.

 

PROPERTIES EJ-298
EJ-298G
Wavelength of Maximum Emission (nm) 435 490
Wavelength of Maximum Absorption (nm) 375 425
Decay Time (ns) 2 8
Quantum Efficiency
> 0.90 > 0.85

 

Chemical Compatibility (for dried paint)
Attacked by: Aromatic solvents, Chlorinated solvents, Ketones, Solvent bonding cements, etc.
Stable in: Water, Dilute acids and alkalis, Lower alcohols, and Silicone greases.

 

EJ-298 Absorption and Emission Spectrum

EJ-298G Absorption and Emission Spectrum