What creates light ?

Its a fact that light(electromagnetic radiation) is created when charged particles are accelerated but what happens in a neutron star(composed of neutrons only) which makes it emit light, neutrons are not charged particle so theoretically a neutron star should not emit any electromagnetic radiation ,so is it that some other factor is creating light ?
Similarly when a particle and its corresponding antiparticle annhilate each other create two photon(light particles) which is well and good for charged particles but when a neutron annhilates an antineutron how is light created(no charged particle involved in overall process) is it a proof for existence of fractional charges called quarks which are the constitute a neutron.