Five new different types of 2D-π-A pyran-based dyes,(vinylcyanoacetate) pyran derivatives,having two donor (2D) and one acceptor (A) groups,were synthesized.All compounds showed a significantly large Stokes shift.The -conjugated moiety,such as the carbazolyl group,as an electron donor group,was not suitable to efficient red-emission color saturation.A locked ring structure of the electron donor group led to narrowing the full width at half maximum (fwhm) and to increasing the dipole moment at a ground state.Also,bulky donor groups led molecular stability to restrain the electronic perturbation at an excited state.