On: Scientists have developed a material so dark that ...

[ghkbrew]

I think that sort of depends on how you define your terms. Generally albedo is how much of the light which hits an object is reflected. A perfect black body, by definition doesn't reflect any light: all of it is absorbed and converted into thermal energy. It does however emit light with a frequency spectrum dependent on its temperature.

So if you wanted to, you could calculate a pseudo-albedo as incident light over emitted light for various conditions, but it wouldn't be an intrinsic property of your material like albedo is usually considered