“Dimensional” effect due to the matrix isolation of luminescent composites of polyphenylquinolines

The dimensional effect previously observed in various matrices for 2,6-polyphenylquinoline containing oxygen bridge and carbazolediyl groups is confirmed for phenylamine-containing 2,6-polyphenylquinolines with carbazole- and indolocarbazolediyl moieties in a polymethyl methacrylate matrix. The effect is observed from the dependence of the luminescence parameters (intensity and peak position) on the film thickness and poly-4-phenylquinoline concentration in the matrix. It is shown that the luminescence intensity decreases as the film thickness decreases to less than 50 micrometers and at distances $\langle D\rangle$ between molecules in the composite of less than 9 nm, with the peak position shifted to shorter wavelengths. The dependence of the luminescence intensity on $\langle D\rangle$ has a clearly pronounced maximum at 6–9 nm.