or this radiation has even less mass then regular photons or ir has immense amounts of energy behind it
the singularity comes from the huge mass of the dieing star the black hole formed from. something like when the nuclear fission reactions inside the star run out of fuel there is no explosive force keeping the sun it's size so it all goes in upon its self and becomes a small dead star, or red dwarf which is only giving off residual heat and light.
if the star is so big and heavy, when it dies, it's own mavity will overpower the weak nuclear force (force keeping atoms apart) and the electron shells of the atoms within will break and every atm will become clusters of neutrons and this remaining clumb of cak is a neutron star.
then in stars that are even bigger, when the thing collapses in on itself the mavity overcomes the stron nuclear force and some more which in essence destroys all the particles (neutrons and then quarks and then even smaller things) in a sense, these particles now become energy but the mavity keeps them together, so a black hole is just a tiny bit of mass with a great standing energy/mass
but i cant really explain how the radiations escapes from it, some thing to do with the magnetic fields on the poles of the black hole, similar in effect to a neutron/pulsar star
**feel free to nit-pick my explanation and correct it