Photoluminescence of singlet oxygen in solutions of fullerenes and suspensions of fulleroids

10.1007/s11449-008-2005-x

“…Figure 3 shows the calculated luminescence pulses of singlet oxygen at wavelengths of 760 and 1270 nm in aerated fullerene solutions at t Σ = 10 -8 s and t ∆ = 10 -3 s (corresponding to the CCl 4 solvent). The comparison of the calculated and experimental [7] luminescence pulses shows that the results of the theory, numerical calculations, and experiment qualitatively coincide. The luminescence at the wavelength of 760 nm has a characteristic quasi-triangular shape with a width of several hundreds of nanoseconds and with the maximum considerably exceeding the maximum of the luminescence at 1270 nm.…”

“…We will start from the results of the experimental study of [7], in which solutions of fullerene in aerated organic liquids were irradiated using two different modes. In the first case, the solution was irradiated by a short (with the duration t p ~ 10 ns) high-intensity ( I 1 0 8 W/cm 2 ) pulse of the second harmonic ( λ = 532 nm) of a neodymium laser.…”

“…Let us use the derived formulas to describe the experiment in [7]. To do this, we chose the following calculation parameters: the concentration of dissolved substances N F = 3 × 10 17 cm -3 and = 6 × 10 18 cm -3 and the laser beam parameters λ = 532 nm, E = 0.6 J/cm 2 , and t p = 10 ns.…”

“…The rate constant of the reaction of excitation of singlet oxygen by triplet fullerene is taken from [6] to be k FO = 3.3 × 10 -12 cm 3 s -1 . For the lifetimes of singlet oxygen, we suggest t Σ = 10 -8 s and t ∆ = 5 × 10 -2 s. These parameters are characteristic of a CCl 4 solvent [4,7] used in [7]. …”

A jet-type singlet oxygen generator based on porous fullerene-containing structures

“…Shortly after the discovery of fullerene, several works reported its use as a photosensibilizer for singlet oxygen gener ation. These studies used fullerene solutions [10][11][12][13][14][15], fullerene containing suspensions [16,17], and solid state film structures [18][19][20][21][22][23]. Of course, the above ref erences do not exhaust the research conducted in this area but rather provide initial information on this sub ject.…”