Supramolecular Aggregation in Bulk Poly(2-methoxy-5-(2‘-ethylhexyloxy)-1,4- phenylenevinylene)

Wavelength and Temperature Dependence of the Femtosecond Pump−Probe Anisotropies in the Conjugated Polymer MEH-PPV: Implications for Energy-Transfer Dynamics

“…The conjugated polymer we study is poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), a well-known phenylene-vinylene polymer whose alkoxy sidegroups give it enhanced solubility and also render it amorphous in the solid state. 14,15 Since its steady state absorption and emission spectra are virtually unchanged in going from dilute solution to the solid phase, there is no evidence that new, interchromophore exciton states are formed in the solid. On the other hand, the fluorescence dynamics do change upon going from the dilute solution to the solid, and there is evidence for the formation of new, low energy trapping states such as excimers.…”

Probing interchain interactions in emissive blends of poly[2-methoxy-5-(2'-ethylhexyloxy)-p-phenylenevinylene] with polystyrene and poly(styrene-co-2-ethylhexyl acrylate) by fluorescence spectroscopy

“…580 nm, 6,7 while in films the photoexcitation results in interchain excitons with redshift emissions λ em > 640 nm or higher. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] MEH-PPV electroluminescence is in general observed at > 640 nm and is coincident with the photoluminescence spectrum. Because of the formation of the interchain species, the efficiencies of electroluminescence conjugated polymer devices are remarkably reduced.…”

“…Because of the formation of the interchain species, the efficiencies of electroluminescence conjugated polymer devices are remarkably reduced. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] To overcome the lack of efficiency, several experiments using MEH-PPV blended with other polymers have been reported. [17][18][19][20][21][22][23][24][25][26][27][28][29][30] Nevertheless, there are several other reasons to prepare blends with electroluminescent materials: to isolate the electroluminescent macromolecules for performing single molecule spectroscopy and understanding the electron energy transfer processes; 25,31,32 to change the emission colors; 23,28,33 by decreasing the aggregation with enhancement of the electron mobility; 34 to combining electron and hole transport properties; 35 to produce white lightemitting LEDs etc.…”

“…O poliestireno marcado com pirenilo e alguns de seus copolímeros foram sintetizados por polimerização em emulsão e caracterizados por 13 C e 1 H NMR, FTIR, GPC, DSC e UV-Vis. Os filmes foram preparados por deposição centrífuga a partir de soluções em clorofórmio, sendo a composição das blendas de 0,1, 0,5, 1,0, e 5,0 m/m% de MEH-PPV.…”

“…Pyrenyl-labeled polystyrene and its copolymers were synthesized by emulsion polymerization and characterized by 13 C and 1 H-NMR, FTIR, GPC, DSC, and UVVis. Spin-coating films of the blends were prepared from chloroform solutions with 0.1, 0.5, 1.0, and 5.0 wt% of MEH-PPV.…”