Hawkins radiation consists of particles with the distribution of wavelengths around gravitational radius of black hole Rs. So, cosmic black holes (with the mass larger than Sun's mass) have radiation with the wavelength lambda >1 km, i.e. can not consist of anything but low-energy photons (not enough density of gravitational field to create massive particles). To make electrons, for instance, a black hole should be as small as Compton wavelength of electron h/(mc)(about 2x10-12 m), to make protons - of the order of proton's Compton wavelength 10-16 m and so on.

I am not sure that such small holes exist in space. At least none have been detected so far.