At Dr. Gassler Electron Devices we are using several different technologies to coat a substrate with phosphor:

• Sedimentation - the phosphor grains are “glued” together with Potassium-Silicate. Screen thickness can be adjusted from 10 -100 µm
• Serigraphic printing - the phosphor is printed through a few micrometer wide mesh onto the substrate. Particle size typically 2-8 µm, screen thickness from a few to 20 µm adjustable, this process delivers phosphor coatings with very high brightness and resolution
• Brushing - the phosphor is pressed with a specific rotating foam into a thin layer of glue. Suitable for small screens from 5 to 30 millimeter diameter, phosphor coatings with particle size 2-3 µm are very dense with high resolution

We always have a wide range of various phosphors with different particle sizes on stock. Coating can be done on all kinds of substrates; Glass, X-Ray protection lead glass, Borosilicate glass, aluminum, stainless steel ….

We can provide two different ways to ensure the electrical contact of the plate:

• ITO Coating directly onto the substrate. Typically, the ITO coating is sputtered onto the glass substrate, followed by a printed phosphor layer on top.
• The phosphor is printed directly to the glass and is covered with a thin layer of evaporated aluminum. The electron beam passes easily through the aluminum. The light created by the phosphor is reflected by the aluminum towards the viewer direction and increases the brightness. Additionally, all disturbing light from a glowing substrate is blocked by the aluminum and contrast is significantly enhanced.

RHEED-Screens are very sensitive against any kind of contacts by fingertips, screwdriver or tweezers. The phosphor surface can be damaged quite easily.
That's why we created our own "Easy-to-use"- RHEED Screen Holder. No tools are required to mount the RHEED Screen, therefore no unintentional damages can hurt your new RHEED Screen. A detailed Manual how to mount a screen is delivered with each holder.
We can supply RHEED Screen Holder for all standard screen diameter of 36 mm, 55 mm, 93 mm and 135 mm 

Our decades of experience in all kinds of phosphor coatings allows us to offer the best suitable technique also for a bit exotic application. Whenever your application or set up requires the visualization of a charged particles beam, we may be able to coat your part with the scintillator you need.
In close co-operation with our partners we develop individual phosphor coatings on almost every suitable substrate, shape or design – from single pieces to serial production.

Just tell us your requirement and together we will find a solution. 

Dr.Gassler Electron Devices manufactures its RHEED Screens on its own production line. Not only standard sizes, but almost all formats and specialities can be realized within short terms.

Our screens are manufactured with a serigraphic printing machine either on Borosilicate glass Bor33 or on X-Ray protection glass RD50. Therefore typically no additional X-Ray protection glass is needed in front of your MBE view port.

For conduction we can provide a direct ITO coating on the glass or an aluminium coating on the back of the phosphor. This aluminium back coating yields in a significant higher light output to the viewer. All light which otherwise would be lost towards the vacuum chamber gets immediately reflected to the viewers direction. Additionally all light produced in the chamber from glowing substrates or elsewhere, is blocked by the optical dense aluminium coating, resulting in a much better contrast. 

Our RHEED screens are individually boxed and protected between 2 spherical glass plates to avoid any damage during shipment and storage.

Please see below our list of standard RHEED Screens. If you do not find your type of screen, just send us the details of the screen you are looking for.

Article #	Glass type	Diameter (mm)	Thickness (mm)	Phosphor	Color	Conductivity via	Remarks
1030	Borosilicate	52	3.2	P43	Green	Aluminum
1037	Borosilicate	93	3.2	P43	Green	Aluminum	20 mm free Sector
1017	Borosilicate	93	3.2	P43	Green	Aluminum
1023	Borosilicate	93	3.2	P43	Green	Aluminum	30 mm free Sector
1027	Borosilicate	93	3.2	P11	Blue	Aluminum	30 mm free Sector
1026	Borosilicate	140	3.2	P43	Green	Aluminum
1019	Borosilicate	93	3.2	P1	Green	ITO
1020	Borosilicate	93	3.2	P11	Blue	ITO
1021	Borosilicate	93	3.2	P1	Green	ITO
1035	Borosilicate	93	3.2	P15	Green	ITO
1028	Borosilicate	135	3.2	P1	Green	ITO
1015	Borosilicate	143	3.2	P43	Green	ITO
1029	Borosilicate	143	3.2	P1	Green	ITO
1006	F2	36	5	P43	Green	Aluminum
1007	F2	55	5	P43	Green	Aluminum
1008	F2	93	5	P43	Green	Aluminum
1009	F2	135	5	P43	Green	Aluminum
1010	F2	36	5	P43	Green	ITO
1011	F2	55	5	P43	Green	ITO
1012	F2	93	5	P43	Green	ITO
1034	F2	93	5	P11	Blue	ITO
1013	F2	135	5	P43	Green	ITO
1005	RD50	36	5	P43	Green	Aluminum
1004	RD50	55	5	P43	Green	Aluminum
1022	RD50	61	5	P43	Green	Aluminum
1002	RD50	93	5	P43	Green	Aluminum
1031	RD50	93	5	P43	Green	Aluminum	30 mm free Sector
1032	RD50	93	5	P43	Green	Aluminum	20 mm free Sector
1033	RD50	93	5	P43	Green	Aluminum	Praseodym activated
1036	RD50	93	5	P11	Blue	Aluminum
1018	RD50	100	5	P43	Green	Aluminum
1003	RD50	135	5	P43	Green	Aluminum
1016	RD50	135	5	P43	Green	Aluminum	Praseodym activated
1014	RD50	93	5	P43	Green	ITO
1025	RD50	93	5	P11	Blue	ITO
1024	RD50	135	5	P43	Green	ITO