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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
I am working on an intriguing modification of my own design to the VFD tube that uses a similar effect. In this case the extra efficiency comes from using a mildly radioactive source (namely 241Am) under pyrolytic graphite in low pressure helium (due to the electron mean free path) I worked out that by doing this the hot filament could be avoided entirely as the burst of electrons caused by those alphas emerging from the PG surface would allow the tube to run in "cold cathode" mode down to <10V at <1mA comparable in efficiency to OLED.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Interesting paper, I'll have to re-read it, but it looks like plain old CF could be a very useful cathode material as well. It's certainly something I'd like to investigate.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Same here.
I did read somewhere that pyrolytic graphite (ie solid not plastic type) if chemically etched first to expose the surface graphene makes quite a good emitter.
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Reticulated Vitreous Carbon as a Field Emission Cathode
