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4hv.org :: Forums :: General Science and Electronics
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Homemade SiC LED

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Conundrum
Fri Aug 21 2009, 07:42PM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Hi all.

Thought you might like these. Taken with my modified (with scanner lens) Olympus u790SW camera.

Interestingly, I managed to get both yellow and green emission at the same time, suggesting a similar breakdown voltage.

regards, -A
1250883724 96 FT0 Carbide
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klugesmith
Thu Aug 27 2009, 09:11PM
klugesmith Registered Member #2099 Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1714
Very nice. Where'd you get the SiC?

Are you familiar with Ernest Glitch, fictional 19th century experimentalist? In a rambling 1861 letter to Michael Faraday, he talks about making crystalline "carbon silicide" in an electric arc furnace, then exploiting its property of cold galvanoluminescence to make what he called LED's. smile Story and illustration (near the bottom) at Link2
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cduma
Thu Aug 27 2009, 09:56PM
cduma Registered Member #1822 Joined: Fri Nov 21 2008, 08:04PM
Location:
Posts: 300
That is really cool! What would I need to perform this experiment for my self?
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Conundrum
Fri Aug 28 2009, 12:17AM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
i have some glowing SiC samples preset in low melt alloy, if they are useful. also have some fresh crystals and there should be a few emissive spots.

pm me if you'd like some. bearing in mind the crystal cost me £16 but i have at least 11 of the glowing ones...

EDIT: they are on ebay as well, includes suitable connectors and ultrafine copper wire for making catswhiskers.

I did wonder about using a calculator's conductive rubber strip as a contact, also could use a small piece of a dead LCD panel's ITO layer. The ideal material would be a sprung gold coated CuBe wire...

EDIT:- another more devious solution is to use conductive thread, as it nicely complies with the surface. Its also somewhat transparent and inherently limits the current so the crystal shouldn't fry.

EDIT 2:- a good source of flexible ITO is the plastic sheet from an old broken touch pad. The sort used in DS's work, as do mobile phones.
Cut a sliver of that, connect to one end's surface using conductive paint or alloy and "probe" the crystal with the other end but same surface.

Failing that, a reasonably strong electrolyte will work to some extent, as SiC doesen't dissolve encasing the crystal in wax/shellac except for the located glowing regions will do the trick.

Its amazing how bright it glows, in some cases almost as good as an early yellow LED.

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