Abstract
Aggregate formation of a conjugated polymer in solutions containing good and poor solvents is studied by amplified spontaneous emission (ASE). It is proved that ASE originates only from isolated polymer chains. For sufficient quantity of the poor solvent, aggregates are formed at the expense of the isolated chains, reducing substantially the optical gain. The critical polymer concentration for aggregation and the size distribution of the aggregates formed are determined by using a model based on thermodynamic principles. The number of isolated chains involved in aggregates of a specific size decreases as aggregates become larger incorporating up to seven chains.
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