Enhanced electroluminescence using polystyrene as a matrix

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Abstract
Poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH–PPV) blends with polystyrene (PS) were used as emitting layers in polymer light-emitting diodes. Studies of photoluminescence and electroluminescence (EL) of the blends indicate that interchain interactions were tremendously suppressed due to the dilution effect. The device of MEH–PPV/PS (50/50) shows much higher EL efficiency compared to pure MEH–PPV devices. Since there is neither energy transfer nor charge transfer involved in MEH–PPV/PS blends, the observed efficiency enhancement is mainly attributed to the suppressed interchain species, which are responsible for the low photoluminescence yields. In addition, the addition of PS into MEH–PPV improves the thermal stability of polymer thin films and reduces the sensitivity of device performance to processing conditions.