We have experimentally investigated the formation of short (tens of nanoseconds) emission pulses in a planar XeBr excilamps excited by the barrier discharge. We have obtained data on the influence of pressure and mixture composition of the gas mixture, as well as of the electrode-gap spacing on the power and duration of the output emission pulse. In the excilamps with the gap of 8 mm, in the mixture of Xe : Br2 = 35 : 1 under the pressure of 156 Tоrr the emission pulses at the wavelength of 282 nm and 55-ns duration (FWHM) were obtained.