abstract |
A carbazole-based compound represented by Formula 1A and 1B: n n n n n n n n n n n n wherein in Formulae 1A and 1B, ring A, groups L 1 , L 2 , L 11 , and L 12 , substituents R 1 to R 9 and R 11 to R 18 , and variables a1 to a4 and b1 to b3 are the same as defined in the specification. |