abstract |
A composition including a first compound represented by Formula 1, a second compound represented by Formula 2, and a third compound satisfying a specified condition: n A 11 -L 11 -A 12 Formula 1 n n A 21 -(L 21 ) a21 -A 22 Formula 2 n n wherein, in Formulae 1 and 2, A 11 , A 12 , A 21 , A 22 , L 11 , L 21 , and a21 are the same as described in the specification. |