Using a phenomenological model in the ultra-relativistic limits we suggest that elementary particles including photons transforms in to micro black holes subjected to the following critical conditions:(i) When the de Broglie wavelength of elementary particles becomes equal to its Schwarzschild radius its energy reaches an upper limit (Em) given by the relation: Em= hc3/2Gm where m is the rest mass of the elementary particle (ii) Particle black holes will have a mass equal to the limiting relativistic mass of the elementary particles and Schwarzschild radius equal to Compton wavelength of these particles. Lorentz invariance of the Compton wavelength of elementary particles in the trans Planckian scales is suggested from this result. Photon black holes are found to be similar to massive elementary particles resembling the Planck particles discussed in cosmology. We find that the known elementary particle physical properties may be a window to the early universe since it provides clues about density distribution and nature of primordial black holes formed during the post Planck era after the Big Bang