Dendronised Polyfluorenes - Towards Stable Blue Emission

Dendronised Polyfluorenes - Towards Stable Blue Emission 

Stable blue PL emission has been obtained from films of both 133 and 134, with no sign of an emission band at 530 nm even after annealing for 24 h in 

Comparative photophysical studies of 90 and 129 suggest that in dendro-nised polyfluorenes the bulkiness of the substituents hinders exciton migration due to increased chain separation [234]. Delayed PL studies [235] of 90 and 134 found that both polymers display a defect emission band at 530 nm, and a band at 480 nm previously attributed to interchain aggregates [205]. This is an interesting result as interchain aggregates had previously been assumed to arise from tt-stacking of the polymer chains. Calculations of 

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