I read about electron interference that in presence of photons there are no fringes formed but in its absence fringe patterns are formed. Can it be explained like this. An electron travels free as a wave . In absence of photons since they are waves they produce interference pattern. But in presence of photons electron wave transforms to particle so there is no wave pattern observed. Is this Correct? Or if there is some other possible explanation for this phenomena then please explain.
There are a couple of inexact things here:
1) "electrons travel free as a wave".
Yes, for our mathematical treatment sometimes it is convenient to treat the traveling electron as a wave. But if the traveling electron is really a wave in the nature, on this there is a debate of tens of years.
2) "in absence of photons, since they are waves, ..."
If the above description as waves is good for the treatment of the respective experiment, it remains good also if photons yes are present around, however the electron wave is perturbed.
3) "in presence of photons electron wave transforms to particle so there is no wave pattern observed.
The formulation "in presence of photons" isn't good. Photons may be present, but not allowed to influence the electrons. Putting it simply, if we try to "watch" the electrons by means of light or whatever other particles that cross the path of the electrons and interact somehow with them, the pattern may be gone.
As an explanation, for producing an interference pattern we split the electron beam by means, for instance, of a 2slit configuration. Well, if photons, or other particles illuminate at least one of the two beams, the interference pattern will be gone.
One of the causes for which the illumination of the electrons during their travel destroys the pattern, is called "decoherence". This is a drastic disturbation of the phases of the two beams due to interaction of the beams with macroscopic apparatuses or with a huge an uncontrollable number of other particles (e.g. your photons). In this case we won't see anymore fringes. Another cause is simply entanglement with other particles e.g. a few photons. In the latter case a state of a couple of particles appears, one of the particles being the electron, other particle(s) the photon(s). The phases of the two electron beams are "complicated" with the additional particles, s.t. on the photographic plate again we won't get fringes.