Infrared photoemitting diode having reduced work function

Details Infrared photoemitting diode having reduced work function Infrared photoemitting diode having reduced work function

1982-05-06

1984-08-07

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

G01J 100

Patent

active

044645724

ABSTRACT:
In electro-optical detectors which include as elements a photoemitting photocathode and anode, a photoemitting diode is fabricated which lowers the diode's work function, thus reducing the cooling requirement typically needed for this type of device. The work function is reduced by sandwiching between the photocathode and anode a liquid medium of the formula NR.sub.3 and having an electron affinity for the electrons of the photocathode, which liquid medium permits free electrons leaving the photocathode to remain as stable solvated species in the liquid medium. Thus, highly light-absorbent, and therefore thin, metallic layers can be used for detection, thereby reducing dark current at a given temperature, with a consequent reduction in cooling requirements at constant detector performance.

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Hirschfeld, "Improvements in Photomultipliers with Total Internal Reflection Sensitivity Enhancement", Applied Optics, 7(3), Mar. 1968, pp. 443-449.

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