In this paper we quantitatively investigate the effect of blending in an active polymer host on the Amplified Spontaneous Emission (ASE) properties of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MeH-PPV). In particular we investigate the ASE dependence of polymer:polymer blends of poly(9,9-dioctylfluorene) (PFO) and (MeH-PPV) on the blend composition. We show that ASE from the 0–1, 0-0 and even dual band is observed in the sample with a relative MeH-PPV content of 10% and that the lowest ASE threshold and the strongest ASE intensity increase with the excitation density are obtained for a MeH-PPV relative content of 25% in weight, with a threshold decrease of 26 times with respect to neat MeH-PPV films. These effects are ascribed to the interplay between the increase of Förster Resonant Energy Transfer from PFO to MeH-PPV dominating up to a MeH-PPV content of 25% and the increase of MeH-PPV aggregation, dominating at higher values of the MeH-PPV content. We also demonstrate that the blend content affects the local emission properties due to variations of the uniformity of the MeH-PPV distribution within the PFO matrix, of MeH-PPV clustering and aggregation. Beyond improving the understanding of the PFO:MeH-PPV interaction in active blends our results can be exploited for the optimization of organic optically pumped lasers based on active polymer:polymer blends.

Poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MeH-PPV) Amplified Spontaneous Emission Optimization in Poly(9,9-dioctylfluorene(PFO):MeH-PPV Active Blends

Anni, Marco
2019

Abstract

In this paper we quantitatively investigate the effect of blending in an active polymer host on the Amplified Spontaneous Emission (ASE) properties of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MeH-PPV). In particular we investigate the ASE dependence of polymer:polymer blends of poly(9,9-dioctylfluorene) (PFO) and (MeH-PPV) on the blend composition. We show that ASE from the 0–1, 0-0 and even dual band is observed in the sample with a relative MeH-PPV content of 10% and that the lowest ASE threshold and the strongest ASE intensity increase with the excitation density are obtained for a MeH-PPV relative content of 25% in weight, with a threshold decrease of 26 times with respect to neat MeH-PPV films. These effects are ascribed to the interplay between the increase of Förster Resonant Energy Transfer from PFO to MeH-PPV dominating up to a MeH-PPV content of 25% and the increase of MeH-PPV aggregation, dominating at higher values of the MeH-PPV content. We also demonstrate that the blend content affects the local emission properties due to variations of the uniformity of the MeH-PPV distribution within the PFO matrix, of MeH-PPV clustering and aggregation. Beyond improving the understanding of the PFO:MeH-PPV interaction in active blends our results can be exploited for the optimization of organic optically pumped lasers based on active polymer:polymer blends.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11587/432656
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