D–π–A dye sensitizer for dye-sensitizedsolarcells (DSSCs), we have designed and synthesized the functionally separated D–π–A fluorescentdye YJY-1 with an aldehyde as an electron-accepting group and a carboxyl group as an anchoringgroup. Furthermore, not only to evaluate the usefulness of D–π–A dye sensitizers functionally separated into an electron acceptor moiety and an anchoringgroup, but also