Phosphor Screens

Name: Phosphor Screens
Brand: Exosens

Phosphor Screens for a wide range of applications: Detection of Electrons, X-Ray, UV, Charged Particles etc. Customized layer arrangement and optimization of thickness for the intended purpose. Standard format substrates on various glass types and fiber optics are available. Upon request substrates according to customer drawing or supplied by customer can be processed.

Fully customizable

High efficiency due to special phosphor settlement process

High uniformity

Low rate of defects/distortions

Phosphor Screens

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Technical Information

Type / Composition		P43 Gd₂O₂S:Tb	P43 FD Gd₂O₂S:Pr,Ce,F	P46 Y₃Al₅O₁₂:Ce	P47 Y₂SiO₅:Ce
Light Emission	Range	360 - 680 nm	480 - 780 nm	490 - 620 nm	370 - 480 nm
	Maximum	545 nm	513 nm	530 nm	400 nm
	Rel. Efficiency*	1	0.95	0.4	0.56
Decay Time	90 % to 10 %	1 ms	4 µs	30ns	100 ns
Decay Time	10 % to 1 %	1.6 ms		90 µs	2.9 µs
Excitation	Electrons	+	+	+	+
	X-Ray	+	+	-	-
	UV (peak sensitivity)	+ (<300 nm)	+ (<305 nm)	+ (<465 nm)	+ (<360 nm)
	α radiation	+	+	+	+
	β radiation	+	+	+	+
	γ radiation	+	+	-	-
	Neutrons	+	+	-	-

Emission Spectra

Description

Available Additional Coatings:

ITO (Indium-Tin-Oxid)

Conductive base coating to reduce electrostatic effects caused by electrons and ions or to apply electrical potential. ITO coating is also known under the name NESA coating. Standard and special conductive parameters can be achieved.

Aluminum reflective coating

To increase light efficiency by up to 100 % and to reduce stray light, it is advantageous for most applications to seal the phosphor coating with an Aluminum layer on top of it. As a standard, a 40 nm to 50 nm coating is recommended, but on special request the thickness can be varied between 40 nm and 130 nm. For electrons, an acceleration voltage of 3 kV is required to penetrate the standard Aluminum reflection layer. With the use of an Aluminum coating, the maximum diameter for the phosphor screen is reduced by 1 mm to allow contact between the Aluminum layer and the substrate.

Chromium ring

Allowing direct electric contact to a phosphor screen, a chromium ring of width up to 100 mm diameter can be sputtered on the outer area of the substrate. This does reduce the area of the phosphor down to the inner diameter of the chromium ring.

Optional Coatings:

Water Glass

To improve the mechanic stability of a phosphor screen, water glass can be added during the sedimentation process.
A screen manufactured this way can resist a light finger touch. An efficiency decrease of 30 % to 40 % results from this manufacturing process as the density of the phosphor grains in the matrix is reduced.

Optical Marks on substrate

Reference marks on glass and fiber optical substrate according customer´s requirements.