IRIS publication 67924380
Anti-Smoluchowski Time-Dependence of the Delayed Fluorescence from Anthracene in Viscous Solution Due to Triplet-Triplet Annihilation - Effect of Forster Energy-Transfer S(1)+T(1)-]S(0)+T(N) on the Initial Spatial-Distribution of Molecules in T(1)
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TY - JOUR - Nickel*, B.,Wilhelm, H. E.,Ruth, A. A. - 1994 - November - Chemical Physics - Anti-Smoluchowski Time-Dependence of the Delayed Fluorescence from Anthracene in Viscous Solution Due to Triplet-Triplet Annihilation - Effect of Forster Energy-Transfer S(1)+T(1)-]S(0)+T(N) on the Initial Spatial-Distribution of Molecules in T(1) - Validated - () - 188 - 2-3 - 267 - 287 - The delayed S1 --> S0 fluorescence from the first electronically excited singlet state S1 of an aromatic compound in liquid solution is caused by diffusion-controlled triplet-triplet annihilation (TTA) T1 + T1 --> S1 + S0. For a random spatial distribution of triplet state molecules at time t = 0, Smoluchowski's theory for a diffusion-controlled reaction predicts a time-dependent rate constant k(d)(t) of TTA with k(d)(0) must-greater-than k(d)(infinity). If the triplet state is populated by optical excitation S0 --> S1 and subsequent intersystem crossing S1 --> T1, it is principally impossible to generate a random distribution of triplet state molecules. Since the pair S1 ... T1 is an intermediate during the creation of a triplet pair T1 ... T1, Forster energy transfer S1 + T1 --> S0 + T(n) may compete with the generation of T1 ... T1 at short intermolecular distances. As a consequence, one expects an anti-Smoluchowski behavior of TTA with k(d)(0) much-less-than k(d)(infinity), or with respect to the intensity of the delayed fluorescence, a strong initial rise. The anti-Smoluchowski behavior of a delayed fluorescence has been observed for the first time (with anthracene in a viscous alkane mixture as solvent). The anti-Smoluchowski behavior can be quantitatively described with a simple kinetic model, which contains only four parameters: the diffusion coefficient of molecules in T1, the Forster radius for the S1-T1 energy transfer, and two parameters specifying an exponential distance dependence of the annihilation rate constant for a triplet pair.The delayed S1 --> S0 fluorescence from the first electronically excited singlet state S1 of an aromatic compound in liquid solution is caused by diffusion-controlled triplet-triplet annihilation (TTA) T1 + T1 --> S1 + S0. For a random spatial distribution of triplet state molecules at time t = 0, Smoluchowski's theory for a diffusion-controlled reaction predicts a time-dependent rate constant k(d)(t) of TTA with k(d)(0) must-greater-than k(d)(infinity). If the triplet state is populated by optical excitation S0 --> S1 and subsequent intersystem crossing S1 --> T1, it is principally impossible to generate a random distribution of triplet state molecules. Since the pair S1 ... T1 is an intermediate during the creation of a triplet pair T1 ... T1, Forster energy transfer S1 + T1 --> S0 + T(n) may compete with the generation of T1 ... T1 at short intermolecular distances. As a consequence, one expects an anti-Smoluchowski behavior of TTA with k(d)(0) much-less-than k(d)(infinity), or with respect to the intensity of the delayed fluorescence, a strong initial rise. The anti-Smoluchowski behavior of a delayed fluorescence has been observed for the first time (with anthracene in a viscous alkane mixture as solvent). The anti-Smoluchowski behavior can be quantitatively described with a simple kinetic model, which contains only four parameters: the diffusion coefficient of molecules in T1, the Forster radius for the S1-T1 energy transfer, and two parameters specifying an exponential distance dependence of the annihilation rate constant for a triplet pair. - 0301-01040301-0104 - ://A1994PP11300012 ://A1994PP11300012 DA - 1994/11 ER -
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@article{V67924380, = {Nickel*, B. and Wilhelm, H. E. and Ruth, A. A. }, = {1994}, = {November}, = {Chemical Physics}, = {Anti-Smoluchowski Time-Dependence of the Delayed Fluorescence from Anthracene in Viscous Solution Due to Triplet-Triplet Annihilation - Effect of Forster Energy-Transfer S(1)+T(1)-]S(0)+T(N) on the Initial Spatial-Distribution of Molecules in T(1)}, = {Validated}, = {()}, = {188}, = {2-3}, pages = {267--287}, = {{The delayed S1 --> S0 fluorescence from the first electronically excited singlet state S1 of an aromatic compound in liquid solution is caused by diffusion-controlled triplet-triplet annihilation (TTA) T1 + T1 --> S1 + S0. For a random spatial distribution of triplet state molecules at time t = 0, Smoluchowski's theory for a diffusion-controlled reaction predicts a time-dependent rate constant k(d)(t) of TTA with k(d)(0) must-greater-than k(d)(infinity). If the triplet state is populated by optical excitation S0 --> S1 and subsequent intersystem crossing S1 --> T1, it is principally impossible to generate a random distribution of triplet state molecules. Since the pair S1 ... T1 is an intermediate during the creation of a triplet pair T1 ... T1, Forster energy transfer S1 + T1 --> S0 + T(n) may compete with the generation of T1 ... T1 at short intermolecular distances. As a consequence, one expects an anti-Smoluchowski behavior of TTA with k(d)(0) much-less-than k(d)(infinity), or with respect to the intensity of the delayed fluorescence, a strong initial rise. The anti-Smoluchowski behavior of a delayed fluorescence has been observed for the first time (with anthracene in a viscous alkane mixture as solvent). The anti-Smoluchowski behavior can be quantitatively described with a simple kinetic model, which contains only four parameters: the diffusion coefficient of molecules in T1, the Forster radius for the S1-T1 energy transfer, and two parameters specifying an exponential distance dependence of the annihilation rate constant for a triplet pair.The delayed S1 --> S0 fluorescence from the first electronically excited singlet state S1 of an aromatic compound in liquid solution is caused by diffusion-controlled triplet-triplet annihilation (TTA) T1 + T1 --> S1 + S0. For a random spatial distribution of triplet state molecules at time t = 0, Smoluchowski's theory for a diffusion-controlled reaction predicts a time-dependent rate constant k(d)(t) of TTA with k(d)(0) must-greater-than k(d)(infinity). If the triplet state is populated by optical excitation S0 --> S1 and subsequent intersystem crossing S1 --> T1, it is principally impossible to generate a random distribution of triplet state molecules. Since the pair S1 ... T1 is an intermediate during the creation of a triplet pair T1 ... T1, Forster energy transfer S1 + T1 --> S0 + T(n) may compete with the generation of T1 ... T1 at short intermolecular distances. As a consequence, one expects an anti-Smoluchowski behavior of TTA with k(d)(0) much-less-than k(d)(infinity), or with respect to the intensity of the delayed fluorescence, a strong initial rise. The anti-Smoluchowski behavior of a delayed fluorescence has been observed for the first time (with anthracene in a viscous alkane mixture as solvent). The anti-Smoluchowski behavior can be quantitatively described with a simple kinetic model, which contains only four parameters: the diffusion coefficient of molecules in T1, the Forster radius for the S1-T1 energy transfer, and two parameters specifying an exponential distance dependence of the annihilation rate constant for a triplet pair.}}, issn = {0301-01040301-0104}, = {://A1994PP11300012 ://A1994PP11300012}, source = {IRIS} }
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AUTHORS | Nickel*, B.,Wilhelm, H. E.,Ruth, A. A. | ||
YEAR | 1994 | ||
MONTH | November | ||
JOURNAL_CODE | Chemical Physics | ||
TITLE | Anti-Smoluchowski Time-Dependence of the Delayed Fluorescence from Anthracene in Viscous Solution Due to Triplet-Triplet Annihilation - Effect of Forster Energy-Transfer S(1)+T(1)-]S(0)+T(N) on the Initial Spatial-Distribution of Molecules in T(1) | ||
STATUS | Validated | ||
TIMES_CITED | () | ||
SEARCH_KEYWORD | |||
VOLUME | 188 | ||
ISSUE | 2-3 | ||
START_PAGE | 267 | ||
END_PAGE | 287 | ||
ABSTRACT | The delayed S1 --> S0 fluorescence from the first electronically excited singlet state S1 of an aromatic compound in liquid solution is caused by diffusion-controlled triplet-triplet annihilation (TTA) T1 + T1 --> S1 + S0. For a random spatial distribution of triplet state molecules at time t = 0, Smoluchowski's theory for a diffusion-controlled reaction predicts a time-dependent rate constant k(d)(t) of TTA with k(d)(0) must-greater-than k(d)(infinity). If the triplet state is populated by optical excitation S0 --> S1 and subsequent intersystem crossing S1 --> T1, it is principally impossible to generate a random distribution of triplet state molecules. Since the pair S1 ... T1 is an intermediate during the creation of a triplet pair T1 ... T1, Forster energy transfer S1 + T1 --> S0 + T(n) may compete with the generation of T1 ... T1 at short intermolecular distances. As a consequence, one expects an anti-Smoluchowski behavior of TTA with k(d)(0) much-less-than k(d)(infinity), or with respect to the intensity of the delayed fluorescence, a strong initial rise. The anti-Smoluchowski behavior of a delayed fluorescence has been observed for the first time (with anthracene in a viscous alkane mixture as solvent). The anti-Smoluchowski behavior can be quantitatively described with a simple kinetic model, which contains only four parameters: the diffusion coefficient of molecules in T1, the Forster radius for the S1-T1 energy transfer, and two parameters specifying an exponential distance dependence of the annihilation rate constant for a triplet pair.The delayed S1 --> S0 fluorescence from the first electronically excited singlet state S1 of an aromatic compound in liquid solution is caused by diffusion-controlled triplet-triplet annihilation (TTA) T1 + T1 --> S1 + S0. For a random spatial distribution of triplet state molecules at time t = 0, Smoluchowski's theory for a diffusion-controlled reaction predicts a time-dependent rate constant k(d)(t) of TTA with k(d)(0) must-greater-than k(d)(infinity). If the triplet state is populated by optical excitation S0 --> S1 and subsequent intersystem crossing S1 --> T1, it is principally impossible to generate a random distribution of triplet state molecules. Since the pair S1 ... T1 is an intermediate during the creation of a triplet pair T1 ... T1, Forster energy transfer S1 + T1 --> S0 + T(n) may compete with the generation of T1 ... T1 at short intermolecular distances. As a consequence, one expects an anti-Smoluchowski behavior of TTA with k(d)(0) much-less-than k(d)(infinity), or with respect to the intensity of the delayed fluorescence, a strong initial rise. The anti-Smoluchowski behavior of a delayed fluorescence has been observed for the first time (with anthracene in a viscous alkane mixture as solvent). The anti-Smoluchowski behavior can be quantitatively described with a simple kinetic model, which contains only four parameters: the diffusion coefficient of molecules in T1, the Forster radius for the S1-T1 energy transfer, and two parameters specifying an exponential distance dependence of the annihilation rate constant for a triplet pair. | ||
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ISBN_ISSN | 0301-01040301-0104 | ||
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URL | ://A1994PP11300012 ://A1994PP11300012 | ||
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