I have not tried it but Tritium is used on some irons.
Supposedly it will show as off-white in daylight and sort of glow in low light light like the old luminous stuff.
Apparently doesn't need recharging and is supposed to emit its own light for 10 years.
http://www.trijicon.com/na_en/products/product1.php?id=BNTNS

Damn, sounds like a guy could go sterile running that.
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NO STEP ON SNEK