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At Scintacor we combine our extensive experience of phosphors with unrivalled coating expertise. This allows us to optimize our electron-beam imaging products for each individual application. We can also offer the extended capability of simplifying your supply-chain by bonding coated screens to sensors if required.
Our phosphor viewing screens can be designed to the exact requirements of your application, by combining the constituents listed below. Moreover, Scintacor has extensive expertise in bonding fibre optic scintillators (FOS) and phosphor viewing screens to CMOS and CCD sensors. Scintacor can provide a turn-key solution, by managing your supply chain and by bonding your sensor and scintillator together in a class 1000 cleanroom environment.
Substrates such as float or other type of glass; fibre optic faceplates (FOP); aluminium plates, or thin PET sheets in simple or complex shapes can be machined to customer requirements. The size of the substrate typically ranges from 10mm to 150mm square or equivalent circle diameter. Special shapes such as prisms and tapers can also be processed.
Undercoat. Dielectric substrates, such as float glass or fibre optic faceplates (FOPs), can be ITO-coated for electrical connection of the screen to the instrument.
Phosphor layer. We routinely work with P22, P22G, P24, P43, P46, P47 but a wider range of other phosphors is available on request. Coating thickness for SEM/TEM and MS applications would typically vary from 3µm to 100µm, but Scintacor has the expertise to coat phosphor layers over 500µm thickness, if requested. The average particle size of the phosphor may range from 1.5µm, for high-resolution screens, to 25µm for applications where high brightness and efficiency are paramount.
Fingerprint-resistant phosphor layer. Phosphor viewing screens are usually irreversibly damaged even by a slight finger touch. However, a process based on potassium silicate, sometimes referred to as “waterglass”, can be provided on request for applications requiring higher mechanical stability. The potassium silicate process produces coatings which can withstand a light touch by hand.
Aluminium top-layer can be added to reduce stray-light and to reflect all of the photons generated towards the detector. As a rule of thumb, the aluminium coating requires a 3Kv minimum acceleration voltage for electrons to pass through. The aluminium layer also serves also as a conductive coating.
Scintillator-camera Bonding. Our proprietary process can attach fibre optic scintillators (FOSs) from 1.5 to 100mm thick to CMOS or CCD sensors without trapped bubbles or particles within the glue line.
Scintacor has been manufacturing phosphor viewing screens for electron microscopy (SEM/TEM) and mass spectrometry (MS) applications for over 20 years and has arguably one of the largest installed base for these critical components. The superior performance of Scintacor phosphor viewing screens and scintillators is not accidental, but hinges on the following factors.