Photophysics of Meh-ppv/ommt Nanocomposites
Year: 2007
Type: article
Abstract: The photoluminescence behaviors of poly(2-methyoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene) (MEH-PPV)/organoclay (OMMT) nanocompsites in both solvent and solid were investigated in this paper.The results demonstrated that nano-layered silicates may enhance the luminescent performance of MEH-PPV primarily based on structural and conformational modulation.The appearance of OMMT could induce more J aggregates other than H aggregates of MEH-PPV,which result in a red-shift of the emission and higher electroluminescence efficiency.To understand the mechanism of the luminescent enhancement for the nanocomposites,the measurements of steady fluorescence emission,fluorescence lifetime (τ) and spin-lattice relaxation time (t_1) of the individual carbon atoms in MEH-PPV for the nanocomposite films were carried out.It is obviously that with increasing OMMT content in the nanocomposites,the Stokes shift together with the fluorescence lifetime showed a prolonging tendency, and the t_1 of the conjugated carbon atoms in MEH-PPV backbone shortened linearly.All of the results indicated that,with the increase of OMMT content,the interchain interaction and π-π~ transition decreased,the proportion of J-aggregation and the mobility of the conjugated segments increased.Consequentially,both the self-aggregation of the polymer chains and the self-quenching of luminescent emission reduced.
Source: Acta Polymerica Sinica
Author: Xigao Jin
Language: German
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2354496500