The interaction between conjugated polymer and fullerenes

Abstract

ABSTRACT:The fluorescence of Poly(2-methoxy,5-(2Ј-ethylhexloxy)-p-phenylene-vinylene) (MEH-PPV) quenched by fullerenes was examined, and the results indicate that this quenching is not dynamic. Strong interaction in the excited state between them may be caused by the photoinduced charge transfer and -conjugated system interaction. More direct and convincing evidence of the charge transfer complex are presented.

Dynamic quenching of 5‐(2′‐ethyl‐hexyloxy)‐p‐phenylene vinylene (MEH‐PPV) by charge transfer to a C60 derivative in solution

“…4. The dependence on quencher concentration is linear with K SV Ϸ 2 ϫ 10 3 M Ϫ1 , which is consistent with the result reported by Zheng et al 12 From eqs. 2 and 3, it is clear that the PL quenching data alone cannot distinguish between dynamic or static processes.…”

“…The fluorescence set-up was arranged in such a way that the "filter effect" due to the absorption of PCBM was Ͻ6% even at the highest PCBM concentration. Nevertheless, to account for the small absorption of PCBM at the excitation and emission wavelength of MEH-PPV, the following equation was used to correct the fluorescence intensity 12 :…”

“…Although almost all previous studies on the physical or chemical properties of charge transfer from conjugated polymers to C 60 were carried out in the solid state, initial measurements of the Stern-Volmer constant (K SV ) were reported by Zheng et al in 1997. 12 We have expanded on their work, including both spectroscopic and temperature dependence measurements carried out on poly[2-methoxy, 5-(2Ј-ethyl-hexyloxy)-p-phenylene vinylene] (MEH-PPV) and 1-(3-methoxycarbonyl)propyl-1-phenyl [6,6]C 61 ( [6,6]PCBM) 13 in solution in 1,2-dichlorobenzene. At room temperature, K SV Ϸ 2 ϫ 10 3 M Ϫ1 ; at high temperatures, K SV is enhanced because thermal energy facilitates the diffusion of PCBM.…”

ChemInform Abstract: Triptycene‐Derived Calix[6]arenes: Synthesis, Structures, and Their Complexation with Fullerenes C60 and C70.

“…A Job plot and fluorescence titration experiments showed that a 1:1 complex was formed between 4 b and C 60 . Accordingly, the association constant K a of the complex 4 b·C 60 was calculated from a plot of F 0 /F cal (F cal : the calibrated fluorescence intensity [16] ) versus C 60 concentration to be 68 970 AE 1706 m À1 . Under the same conditions, it was found that addition of C 70 also led to a significant quenching of the fluorescence of 4 b.…”

Synthesis and opto-electrical properties of carbazole functionalized quinoline based conjugated oligomer for luminescent devices

“…Where E and E are the oxidation and reduction potentials relative to Ag/Ag+ electrode [40]. The onset of QUI-OCZ oxidation is +1.34 V and reduction is −1.23 V vs. Ag/Ag + electrode, which is corresponding to HOMO level of −5.74 eV and LUMO level of −3.17 eV respectively.…”