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We present semi-analytical models of high redshift Lyman-{\alpha} emitters(LAEs) in order to constrain the star formation efficiency in those galaxies.Our supernova feedback induced star formation model along with Sheth-Tormmanhalo mass function correctly reproduces the shape, amplitude and the redshiftevolution of UV and Lyman-{\alpha} luminosity functions of LAEs in the redshiftrange z = 2 to 7.3. We show that the fraction of Lyman-{\alpha} emittinggalaxies increases with increasing redshifts reaching to unity just after thereionisation. However, we show that star formation efficiency in those LAEsdoes not show any redshift evolution within the uncertainty in availableobservations. This would have significant repercussion on the reionisation ofthe intergalactic medium.

On the star formation efficiency in high redshift Lyman-{\alpha} emitters