Monoazo dichroic dye compound, polarizing plate composition comprising same, polarizing plate formed therefrom, and optical device comprising same

A mono-azo dichroic dye compound represented by Chemical Formula 1:

• wherein R1 is selected from the group consisting of:
• substituted or non-substituted aryl groups having 6-20 carbon atoms, substituted or non-substituted heteroaryl groups having 3-20 carbon atoms, substituted or non-substituted alkyl groups having 1-20 carbon atoms, —NR4OH, —NHR5, —NR6, —OR7, —COOR8, —OCOR9, —SR10, halogen groups, —OH, —CN, —COOH, —PO3, —SO3, and —NO2;
• wherein R2 is selected from the group consisting of:
• H, substituted or non-substituted aryl groups having 6-20 carbon atoms, substituted or non-substituted heteroaryl groups having 3-20 carbon atoms, substituted or non-substituted alkyl groups having 1-20 carbon atoms, —NR4OH, —NHR5, —NR6, —OR7, —COOR8, —OCOR9, —SR10, halogen groups, —OH, —CN, —COOH, —PO3, —SO3, and —NO2;
• R3 is a substituted or non-substituted heterocyclic group having 2-20 carbon atoms, or 1,3-indanedione non-substituted or substituted with one or more of alkyl, arylalkyl, aryl, halogen, alkoxy, alkoxyalkyl, alkoxyaryl, nitro, cyano, carboxyl and amide groups;
• wherein each of R4-R10 is independently H or a group having 1-20 carbon atoms selected from the group consisting of:
• alkoxy groups, or alkoxyalkyl groups;
• halogen-containing alkyl groups;
• heterocyclic groups, aryl groups, non-substituted or substituted with one or more of alkoxy groups, alkoxyalkyl groups, halogens and alkyl groups;
• each of X1 and X2 is independently selected from the group consisting of N, S, O and C;
• and
• each of Y1 and Y2 selected from the group consisting of C, S, O and N.