We present a room-temperature study of the well-width-dependent carrier lifetimes in InGaN single-quantum wells. At room temperature, carrier recombination was found to be dominated by interface-related nonradiative processes. The dominant radiative recombination at room temperature was through band-to-band free carriers. For the sample grown at a higher growth rate, we observed a longer luminescence lifetime, which was attributed to an improved quantum well interface. ©1997 American Institute of Physics.