Exciton diffusion length of tris (dibenzoylmethane) mono (phenanthroline) europium (III) measured by photocurrent and absorption as a function of wavelength

Black, Marcie R.; Chavez, Craig; Brosha, Eric L.

doi:10.1016/j.orgel.2007.04.011

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…Eq. (23). This of course becomes the more important, the stronger the couplings are and the lower the shielding is, as can be seen by the comparison between the diffusion constants calculated with ε r = 1 and 3, respectively.…”

Section: B Anthracenementioning

confidence: 80%

“…13,[15][16][17][18] That is why the exciton, which is created by the incident light, must reach the donor-acceptor interface prior to recombination in order to become dissociated. While the typical diffusion lengths are a few tens of nanometers, [19][20][21][22][23][24][25][26][27][28][29][30][31] the absorption lengths of organic semiconductors are about 80-200 nm, 32 which necessitates a compromise of the layer thickness in bilayer cells. In order to improve organic solar cells, it is important to understand the basic principles of exciton transport in these materials and to be able to estimate the diffusion lengths of different promising materials.…”

Section: Introductionmentioning

confidence: 99%

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Anisotropy of singlet exciton diffusion in organic semiconductor crystals from ab initio approaches

Stehr

Engels

Deibel

et al. 2014

The Journal of Chemical Physics

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Due to its importance for the function of organic optoelectronic devices, accurate simulations of the singlet exciton diffusion are crucial to predict the performance of new materials. We present a protocol which allows for the efficient directional analysis of exciton transport with high-level ab initio methods. It is based on an alternative to the frequently employed rate equation since the latter was found to be erroneous in some cases. The new approach can be used in combination with the master equation which is considerably faster than the corresponding Monte Carlo approach. The long-range character of the singlet exciton coupling is taken into account by an extrapolation scheme. The approach is applied to singlet exciton diffusion in those substances where these quantities are experimentally best established: naphthalene and anthracene. The high quality of the crystals, furthermore, diminish uncertainties arising from the geometrical structures used in the computations. For those systems, our new approach provides exciton diffusion lengths L for naphthalene and anthracene crystals which show an excellent agreement with their experimental counterparts. For anthracene, for example, the computed L value in a direction is computed to 58 nm while the experimental value is 60 ± 10 nm.

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Section: B Anthracenementioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Anisotropy of singlet exciton diffusion in organic semiconductor crystals from ab initio approaches

Stehr

Engels

Deibel

et al. 2014

The Journal of Chemical Physics

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“…In that paper, characteristics for highly‐ordered molecular crystals of rubrene were recorded and analyzed to yield the diffusion lengths between 10 and 50 nm. Finally, both the SR‐PLQ and PC methods were used to investigate spun‐on tris (dibenzoylmethane) mono (phenantroline) europium (Eu(DBM) 3 phen) films where the exciton diffusion length of (25.0 ± 0.8) nm has been determined . In such compounds, however, the biexcitonic quenching among the excited Eu 3+ ions decaying radiatively (mainly via the 5 D 0 → 7 F 2 transition) is considered as a dominating channel of the exciton decay…”

Section: Introductionmentioning

confidence: 99%

Singlet Exciton Diffusion in Vacuum‐Evaporated Films of Amine‐Based Materials as Studied by Photocurrent and Photoluminescence Quenching Methods

Pelczarski

Grygiel

Stampor

2018

Physica Status Solidi (b)

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The singlet exciton diffusion lengths are determined by the photoconductivity as well as the luminescence surface quenching technique, in vacuumevaporated layers of (4,4 0 ,4 00 -tris(N-(3-methylphenyl)-N-phenylylamino) triphenylamine) (m-MTDATA), 4,4 0 ,4 00 -tris[2-naphthyl(phenyl)amino] triphenylamine (2TNATA), and N,N 0 -diphenyl-N,N 0 -bis(3-methylphenyl)-[1,1 0 -biphenyl]-4,4 0 -diamine (TPD) which are frequently used for fabrication of electroluminescent and photovoltaic devices. The values are found to be as high as (30 AE 10) nm in 2TNATA and m-MTDATA, as well as (46 AE 9) nm in TPD films. The corresponding singlet diffusion coefficients of the range between 1 Â 10 À3 and 1 Â 10 À2 cm 2 s À1 , according to a comprehensive study undertaken, are assigned to a sizable electronic coupling induced by strong interactions of intra-and inter-molecular origin in the investigated materials.

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Solution‐Processed Organic Photovoltaic Cells with Anthracene Derivatives

Chung¹,

Park²,

Yun³

et al. 2010

ChemSusChem

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Solution-processed small-molecule bulk heterojunction photovoltaic cells are fabricated by using [6,6]-phenyl-C(61)-butyric acid methyl ester (PCBM) as electron acceptor and triisopropylsilylethynyl anthracene (TIPSAnt) derivatives substituted with naphthalene (TIPSAntNa) and bithiophene (TIPSAntBT) as electron donors. In contrast to TIPS-pentacene, the TIPSAnt derivatives are not susceptible to Diels-Alder reactions with PCBM when processed in solution, as confirmed by UV/Vis measurements. Photoluminescence quenching measurements show exciton diffusion lengths of 5 and 3 nm for TIPSAntBT and TIPSAntNa, respectively. Blending TIPSAntBT and TIPSAntNa with PCBM (1:1, 1:2, 1:3, and 1:4 weight ratios) produces films that possess adequate hole and electron mobilities. The morphological changes that result from varying the blending ratio range from obvious phase-segregated crystalline domains at a 1:1 ratio to homogeneous, nearly amorphous phases at a 1:4 ratio. Bulk heterojunction solar cells prepared by using a TIPSAntBT:PCBM blend reach power conversion efficiencies as high as 1.4 %.

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Exciton diffusion length of tris (dibenzoylmethane) mono (phenanthroline) europium (III) measured by photocurrent and absorption as a function of wavelength

Cited by 4 publications

References 14 publications

Anisotropy of singlet exciton diffusion in organic semiconductor crystals from ab initio approaches

Anisotropy of singlet exciton diffusion in organic semiconductor crystals from ab initio approaches

Singlet Exciton Diffusion in Vacuum‐Evaporated Films of Amine‐Based Materials as Studied by Photocurrent and Photoluminescence Quenching Methods

Solution‐Processed Organic Photovoltaic Cells with Anthracene Derivatives

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