Organic nonlinear optical materials.

摘要

Organic nonlinear optical materials that have light absorption in the crystal at wavelengths shorter than 390 nm, that have good crystallinity and processability, that have a non-centrosymmetry molecular arrangement and that hence are suitable for use in wavelength conversion devices comprises compounds having the formula I: <CHEM> where R<1>, R<2> and R<3> which may be the same or different represent a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group; R<4> is a hydrogen atom, an alkyl group, an aryl group, a heterocyclic group or an electron withdrawing group; R<5> which may be the same or different represent a hydrogen atom, an alkyl group, an aryl group, a heterocyclic group or an electron donating group; m is an integer of 1 to 4; when m is 2 or more, two or more R<5>s may bind together to form a ring; provided that R<3> is not a methyl group when R<1>, R<2>, R<4> and R<5> are all hydrogen atoms.