In this study, BGaAsSb thick layers and BGaAsSb/GaAs quantum wells (QWs) have been grown on GaAs (001) by low pressure metal-organic vapor deposition (LP-MOCVD) for the first time. It has been found that for both GaAs1-ySby thick layer and GaAs1_Sb-y(y)/GaAs QWs, the incorporation of boron leads to a decrease in Sb segregation and causes an increased solid Sb content y as well as a higher compressive strain. Similarly, Sb segregation also recedes when the arsenic partial pressure is lowered, and Sb-incorporation efficiency increases significantly. In both cases, the quaternary BGaAsSb alloys cannot be grown lattice-matched to GaAs. In addition, the PL peak wavelength red-shifts when boron is incorporated. This is in accordance with the increased Sb content. (C) 2014 Elsevier B.V. All rights reserved