Absorption spectrum and decay kinetics of triplet pentacene in solution, studied by flash photolysis

Hellner, Christer; Lindqvist, Lars; Roberge, Pierre C.

doi:10.1039/f29726801928

Cited by 54 publications

(68 citation statements)

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“…The FEMO predictions are compared in Fig. 3 with Orloff's calculations as well as with predictions using a semiempirical Hiickel correlation (19,20). Except for the second 3B3,-t 3B2,+ transitions (1,-(z)), there is a good agreement between the different calculations.…”

Section: Femo Calculated Transition Energiesmentioning

confidence: 62%

Phenyl Substitution Effects on Triplet–Triplet Absorption Spectra: I. Study of 1,3,6,8-Tetraphenylpyrene

Rullière¹,

Colson²,

Roberge³

1975

Can. J. Chem.

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The triplet–triplet (T–T) absorption spectrum of 1,3,6,8-tetraphenylpyrene (TPP) was measured from 400 to 620 nm. The data obtained are compared with theoretical calculations using the Ruedenberg–Scherr FEMO model. A planar triplet state is evidenced by fine vibrational structure. The T–T quenching rate constant measured (1.3 ± 0.1 × 109 M−1 s−1) is 20% of the expected diffusion-controlled value.

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Section: Femo Calculated Transition Energiesmentioning

confidence: 62%

Phenyl Substitution Effects on Triplet–Triplet Absorption Spectra: I. Study of 1,3,6,8-Tetraphenylpyrene

Rullière¹,

Colson²,

Roberge³

1975

Can. J. Chem.

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“…The absorption had a peak of 510 nm, which correlated well with the reported T-T absorption of pentacene. [24] The time profile of the absorbance at 510 nm is shown in Figure 6b. The lifetime of the transient absorption was 48.48 (AE 0.15) ms, and this transient absorption disappeared completely as oxygen was bubbled into the solution.…”

Section: Wwwchemeurjorgmentioning

confidence: 99%

Photochemical Synthesis of Pentacene and its Derivatives

Yamada

Yamashita

Kikuchi

et al. 2005

Chemistry A European J

150

103

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A novel alpha-diketone precursor of pentacene, 6,13-dihydro-6,13-ethanopentacene-15,16-dione, was prepared and converted successfully to pentacene in 74 % yield by photolysis of the precursor in toluene: Irradiation of the diketone solution in toluene with light of 460 nm under an Ar atmosphere caused the solution to change from yellow to fluorescent orange-pink within a few minutes, after which, purple precipitates appeared. After 35 min, the solution changed to colorless and the purple precipitates were filtered to give pentacene in 74 % yield. By contrast, in the presence of oxygen, the color of the solution changed from yellow to pale yellow, and only 6,13-endoperoxide of pentacene was quantitatively obtained. The rate of the reaction upon photolysis was measured by observing the decay of n-pi* absorption of the precursor at 460 nm, and was found to be similar in both the presence and absence of oxygen. Therefore, the photoreaction of the alpha-diketone precursor seemed to occur via the singlet excited state. Because the T-T absorption of pentacene was observed upon photolysis of the precursor in the nanosecond transient absorption measurement under an Ar atmosphere, the excited triplet state of the pentacene generated singlet oxygen by sensitization, and it reacted with the ground-state pentacene to give the 6,13-endoperoxide. The alpha-diketone deposited on glass was also converted successfully to pentacene film by photoirradiation. In addition, diketone precursors of a mixture of 2,8- and 2,9-dibromopentacene and 2,6-trianthrylene were also prepared and their photoconversion was performed.

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“…In the solid state the triplet energy has been measured indirectly using variable temperature host guest fluorescence 16 , electron backscattering from crystalline pentacene 17 , and inelastic tunnel ling spectroscopy on amorphous pentacene 18 . In solution it has been studied using broadband flash photolysis [19][20][21] , and estimated via a range of theoretical calculations [22][23][24][25][26] . However it is unclear that these energies are relevant to ionization at a polycrystalline pentacene heterojunction.…”

mentioning

confidence: 99%

In situ measurement of exciton energy in hybrid singlet-fission solar cells

et al. 2012

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singlet exciton fission-sensitized solar cells have the potential to exceed the shockley-Queisser limit by generating additional photocurrent from high-energy photons. Pentacene is an organic semiconductor that undergoes efficient singlet fission-the conversion of singlet excitons into pairs of triplets. However, the pentacene triplet is non-emissive, and uncertainty regarding its energy has hindered device design. Here we present an in situ measurement of the pentacene triplet energy by fabricating a series of bilayer solar cells with infrared-absorbing nanocrystals of varying bandgaps. We show that the pentacene triplet energy is at least 0.85 eV and at most 1.00 eV in operating devices. our devices generate photocurrent from triplets, and achieve external quantum efficiencies up to 80%, and power conversion efficiencies of 4.7%. This establishes the general use of nanocrystal size series to measure the energy of non-emissive excited states, and suggests that fission-sensitized solar cells are a favourable candidate for third-generation photovoltaics.

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Absorption spectrum and decay kinetics of triplet pentacene in solution, studied by flash photolysis

Cited by 54 publications

References 0 publications

Phenyl Substitution Effects on Triplet–Triplet Absorption Spectra: I. Study of 1,3,6,8-Tetraphenylpyrene

Phenyl Substitution Effects on Triplet–Triplet Absorption Spectra: I. Study of 1,3,6,8-Tetraphenylpyrene

Photochemical Synthesis of Pentacene and its Derivatives

In situ measurement of exciton energy in hybrid singlet-fission solar cells

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