Abstract
The exciton dynamics and optical characteristics of blue-emitting N,${\mathrm{N}}^{\ensuremath{'}}$-diphenyl-1,4-phenylene-diamine oligoaniline films have been determined. Transient photoluminescence experiments are consistent with internal quantum yields of $\ensuremath{\sim}5.3%$ and 10.1% measured for oriented and nonoriented films, respectively. The data indicate a drastic dependence on nanoscale ordering which promotes photoluminescence quenching, a large annihilation rate, and fast exciton diffusion. Therefore, the emission properties can be controlled by the textural morphologies of the layers.
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