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 each of R1 and R2 independently represents any one selected from the group consisting of:
• substituted or non-substituted aryl groups having 1-20 carbon atoms, substituted or non-substituted heteroaryl groups having 1-20 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 R3 independently represents any one selected from the group consisting of:
• H, from substituted or non-substituted aryl groups having 1-20 carbon atoms, substituted or non-substituted heteroaryl groups having 1-20 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 each of R4-R10 has 1-20 carbon atoms, and independently represents any one selected from the group consisting of:
• H, alkoxy groups, alkoxyalkyl groups, halogen atoms, halogen-containing alkyl groups, heterocyclic groups, aryl groups, non-substituted or substituted with at least one selected from the group consisting of alkoxy groups, alkoxyalkyl groups, halogens and alkyl groups;
• each of X1 and X2 independently represents any one selected from the group consisting of N, S, O and C;
• each of Y1 and Y2 independently represents any one selected from the group consisting of C, S, O and N;
• and
• Z represents any one selected from the group consisting of CN, COOR11, indanone and 1,3-dioxoindane, wherein R11 is any one selected from the group consisting of alkyl groups, aryl groups, and substituted or non-substituted heteroaryl groups.