The organic semiconductor polymers relates to the synthesis of a carbazole-based ladder polymer. The synthesis of the ladder polymer includes forming a precursor conjugated polymer by Suzuki step growth polymerization of 2,7-dibromocarbazole with 1,4-dibromo-2,5-divinylbenzene, followed by end capping with 2-bromostyrene and 2-vinyl-phenylboronic acid. Then, the pendent vinyl groups are closed by ring-closing olefin metathesis to obtain the ladder polymer.

A ladder tetrazine polymer is disclosed.

A ladder tetrazine polymer is disclosed.

A ladder tetrazine polymer is disclosed.

A polybenzodifuran ladder polymer is disclosed.

A polybenzodifuran ladder polymer is disclosed.

An organic light-emitting device including: a first electrode; a second electrode facing the first electrode; an emission layer between the first electrode and the second electrode; a hole transport region between the first electrode and the emission layer; and an electron transport region between the emission layer and the second electrode, the electron transport region including an intermediate layer, wherein the emission layer includes a first compound and a second compound, each independently selected from compounds represented by Formula 1, and the intermediate layer includes a third compound and a fourth compound, each independently selected from compounds represented by Formula 2: ##STR00001##

A polybenzodifuran ladder polymer is disclosed.

A ladder tetrazine polymer is disclosed.

A polybenzodifuran ladder polymer is disclosed.