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A dependency between the molecular weight distribution of polyfluorene PFO and its aggregation tendency on operation in organic light-emitting devices OLED is described. As a result of these findings, low molecular parts of the polymer could be made responsible for the aggregation in liquid crystalline PFO. Consequently, a procedure was developed which leads to PFO-based OLEDs which do not show aggregation on operation anymore but exhibit highly efficient and stable blue electroluminescence.© 2000 American Institute of Physics. S0003-69510002518-3

Remarkable progress can be observed in the development of organic light-emitting diodes OLEDs using polymetric as well as small molecules for various applications. 1 Recently, especially, the OLEDs based on conjugated polymers like poly-para-phenylen-vinylene PPV reached a high level of performance with regard to efficiency, brightness, and …