Photoluminescence study of (GaAs1-xSbx/InyG a1-yAs)/GaAs bilayer quantum wells (BQWs) grown by molecular beam epitaxy (MBE) were carried out. Temperature and excitation power dependent photoluminescence (PL) s tudy indicated that the band alignment of the BQWs is type - Ⅱ. The origin of the double-peak luminescence was discussed. Under optimized growth conditions, t he PL emission wavelength from the BQWs has been extend up to 131 μm with a s ingle peak at room temperature.