Phosphor Screens

October 12, 2000

For a limited time, Colutron Research has cut prices on all our standard and custom phosphor screens. For more information on this price reduction, please follow the link Colutron Phosphor Screen Price Reduction.  


The phosphor screens used by the BVS and BIS systems are available separately. They consist of a glass disc or fiberoptic plate coated with P-20 phosphor and are aluminized. An extra layer of aluminum is deposited in a ring 0.050" (1.27 mm) wide on the outer diameter of the phosphor screens. This allows for electrical contact to the phosphor screen using optionally available metal contact rings. Screens are aluminized to increase light efficiency by up to 100% since light created at the phosphor is reflected back at the aluminum layer. Also, the conductive aluminum layer aids in the reduction of charge build up from electrons and ions. If the phosphor screen is used in conjunction with an electron multiplier such as a microchannel plate (MCP), an electron acceleration energy of 3kV will be required to pierce the aluminum layer. If this acceleration voltage is too high for a particular application, indium-tin-oxide (ITO) coated screens can be used to provide the conductive base needed to minimize the electrostatic effects of charged particles. Phosphor screens can also be ordered with P-11, P43, P46, and P-47 phosphors. If a custom size is required, or you need your own disc re-coated, please contact Colutron Research for a quotation.

Part Number

Material

Phosphor Type

Phosphor Thickness

Dimensions f (mm diameter)

Effective Area f (mm diameter)

Thickness (mm)

Tapered Ratio

Input Surface

Output Surface

Input Surface

Output Surface

805-1

Glass disc

P20 Aluminized

P20: 10-15 m Al: 250-500 Å

24.76

24.76

22.22

22.22

1.55

1:1

805-2

Glass disc

P20 Aluminized

P20: 10-15 m, Al: 250-500 Å

50.17

50.17

47.63

47.63

1.55

1:1

705-1

Fiberoptic

P20 Aluminized

P20: 10-15 m, Al: 250-500 Å

22.23

22.23

19.69

19.69

6.36

1:1

705-2

Fiberoptic

P20 Aluminized

P20: 10-15 m, Al: 250-500 Å

28.14

13.7

25.60

12.80

28.0

2:1

705-3

Fiberoptic

P20 Aluminized

P20: 10-15 m, Al: 250-500 Å

41.0

13.7

38.46

12.82

41.0

3:1

705-4

Fiberoptic

P20 Aluminized

P20: 10-15 m, Al: 250-500 Å

54.8

13.7

52.26

13.07

60.0

4:1

 

 

Phosphor Type

Chemical Composition

Typical Peak Wavelength

Fluorescent Color

Decay Time

Typical Quantum Yield (photons/electron-volt)

Typical Absolute Efficiency (radiated watts/watt excitation

Remarks

P11

ZnS:Ag

460 nm

Blue

34m s

0.038

0.10

Good energy conversion (efficiency) for blue light

P20

ZnCdS:Ag

560nm

Yellow-green

60m s

0.063

0.14

Good energy conversion (efficiency)for green light, Good for UV radiation, 250nm to 300nm

P43

Gd2O2S:Tb

545nm

Green

1ms

-

-

Excellent scintillator for x-rays < 250nm.

P46

Y3Al5O12:Ce

530nm

Yellow-green

300ns

-

-

 

P47

Y2SiO5:Ce

400nm

Blue

55ns

-

-

 Fast Decay

 


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