Abstract
Poly(vinyl pyrrolidone) (PVP) was mixed with poly(phenylene vinylene) (PPV) precursor (III) aqueous solution to prepare the PPV/PVP polyblends and its dilution effect on the luminescence properties of PPV was investigated. PVP is miscible with PPV precursor but immiscible with the transformed PPV. In PPV/PVP polyblends, PPV conjugated segments preserved their configuration of C2h symmetry but with less packing. The size of PPV phase is similar to the reported PPV crystallites and was decreased with the content of PVP. As to the photoluminescence (PL) properties, the energy gap to produce the excitons in the PPV conjugated chains was not changed by blending with PVP, whereas the PL intensity per mole of PPV conjugated units was increased. It was attributed to the dilution effect that decreased the non-radiative interchain's quenching of excitons. Similar results were also found for the electroluminescence (EL) properties of ITO/polyblend/Al light emitting diode (LED) device, except that the current to generate the excitons might leak to the PVP phase. As a result, the optimal content of PVP in polyblends to provide the best EL performance was 15-20 wt%.
Original language | English |
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Pages (from-to) | 71-87 |
Number of pages | 17 |
Journal | ACS Symposium Series |
Volume | 726 |
Publication status | Published - 1999 Dec 1 |
All Science Journal Classification (ASJC) codes
- General Chemistry
- General Chemical Engineering