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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 3.3 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

 

WAVELENGTH SHIFTERS

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WLS Materials

 

Eljen Technology offers a select range of wavelength shifting materials that absorb light at one wavelength and re-emit the light isotropically at longer wavelengths to provide useful modes of light collection. Four PVT based wavelength shifting plastics and two wavelength shifting paints used to make thin films are available.

 

WAVELENGTH SHIFTING PRODUCTS

Material Description/Application
Commercial
Equivalents
NE S-G
EJ-280 Green-emitting wavelength shifting plastic - BC-482A
EJ-282 Green-emitting wavelength shifting plastic - -
EJ-284 Red-emitting wavelength shifting plastic - -
EJ-286 Blue-emitting wavelength shifting plastic - BC-480
EJ-298 Blue-emitting wavelength shifting paint, used to make thin films - -
EJ-298G Green-emitting wavelength shifting paint, used to make thin films  - -

New Products

Plastic Fibers

Scintillation and Wavelength Shifting Plastic Fibers

Eljen Technology is proud to introduce our own brand of plastic fiber optics that are designed for applications needing fiber optics and flexibility. Our fibers are offered in plastic matrix bases of polyvinyl toluene (PVT) or polystyrene (PS) and in formulations based on standard Eljen scintillation and wavelength shifting plastics.

EJ-270

Lithium-6 Loaded PSD Plastic Scintillator
EJ-270

This new scintillator contains Lithium-6 and is formulated to provide pulse shape discrimination (PSD) to detect and identify fast neutrons, gammas, and thermal neutrons.

Non-Fogging Plastic

Non-Fogging Plastic Scintillators:
EJ-200NF and EJ-208NF

Designed specifically for outdoor detector systems, these scintillators can withstand the stresses of large temperature variations and moisture absorption that eventually lead to fogging and reduced detector performance in conventional plastic scintillators.

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