Delayed Fluorescence and Triplet-Triplet Annihilation in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">π</mml:mi></mml:math>-Conjugated Polymers

Partee, J.; Frankevich, E. L.; Uhlhorn, Brian L.; Shinar, J.; Ding, Yun; Barton, Thomas J.

doi:10.1103/physrevlett.82.3673

Cited by 157 publications

(81 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Almost all parameters can be taken from the literature. 19,23,30,[36][37][38][39] The only unknown parameter is P T , although it should be on the order of a few percent at large magnetic fields. 11 We can also derive the MC of the HFE with…”

Section: Analytical Calculationsmentioning

confidence: 99%

Traps and trions as origin of magnetoresistance in organic semiconductors

et al. 2013

View full text Add to dashboard Cite

The large effect of a small magnetic field on the current, magnetoconductance (MC), in organic semiconductors-so-called organic magnetoresistance-has puzzled the field of organic spintronics during the last decade. Although the microscopic mechanisms regarding spin mixing are well understood by now, it is still unknown which pairs of spin carrying particles are influencing the current in such a drastic manner. Here, a model for the MC is presented based on the spin selective formation of metastable trions from triplet exciton-polaron pairs. Additionally, the magnetic-field and voltage dependence of the MC are experimentally investigated in materials showing large effects. Using a combination of analytical and numerical calculations, it is shown that the MC is perfectly described by a process in which trions are created at polaron trap sites.

show abstract

Section: Analytical Calculationsmentioning

confidence: 99%

Traps and trions as origin of magnetoresistance in organic semiconductors

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Triplet states of conjugated polymers have, in the solid state, lifetimes of the order of a few milliseconds, which again make them very susceptible to degradation induced by light. In addition, they also show high extinction coefficients for optical transition to higher energy states in the triplet manifold [4,16], which can affect their potential for use in all organic laser systems. Moreover, since triplet states of conjugated polymers, in the absence of appropriate metal complex triplet emitters, are generally devoid of phosphorescence, radiationless processes will be one of the major energy loss mechanisms in LED devices.…”

Section: Introductionmentioning

confidence: 99%

“…For such applications, one important drawback of these compounds is related to the formation of excited triplet states. These are expected to be the predominant species formed by charge recombination in electroluminescent devices (75 % from spin statistics) [4] and because singlet oxygen formation (via interaction with oxygen) is observed following photolysis of aerated solutions of conjugated polymers [15], it may have important implications in a device working and consequently lead to degradation of devices based on conjugated polymers [12]. Triplet states of conjugated polymers have, in the solid state, lifetimes of the order of a few milliseconds, which again make them very susceptible to degradation induced by light.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electronic spectral and photophysical properties of some p-phenylenevinylene oligomers in solution and thin films

Melo

Pina

Paolo³

et al. 2006

Chemical Physics

View full text Add to dashboard Cite

A comprehensive photophysical and spectroscopic study of a new class of p-phenylenevinylene oligomers (PPV-trimers) possessing different alkyl and alkyloxy sidechain substituents and different end groups (aldehyde, C@C, phenylene and anthracene units) was undertaken in solution at room temperature (293 K), low temperature (77 K) and in thin films. The study comprises absorption, emission and triplet-triplet absorption spectra, together with quantitative measurements of quantum yields (fluorescence, intersystem crossing, internal conversion and singlet oxygen formation) and lifetimes. The data allow the determination of rate constants for all decay processes. From these, several conclusions could be drawn. Changing from alkyl to alkyloxy substituents does not change fluorescence and internal conversion yields but decreases the (already small) intersystem crossing yield. The introduction of anthracene at the terminal ends of the PPV-trimers leads to the lowest fluorescence yield reported in this study. Of particular importance is the fact that the fluorescence quantum yields in films are of the same order of magnitude as those in solution, which suggests the potential for use of these oligomers for light-emitting device applications. With one of the alkyloxy derivatives, a more detailed study of the early part of the fluorescence decay was made, and it was found that upon excitation a fast conformational relaxation process of the initially excited oligomer occurs, leading to a more planar conjugation segment.

show abstract

“…Since about 70% of the solar energy is in the 380 to 900 nm range, an ideal polymer that optimizes and would have a bandgap of ~1.4-1.5 eV [47], with a HOMO level of -5.4 eV and LUMO level of -3.9 eV [47][48]. affects ; when it is low, there are alternate low resistance paths for light-generated current, which lead to power losses and reduced [49].…”

Section: Fig 7 (A) Equivalent Circuit [39] and (B) Light I-v Curve mentioning

confidence: 99%

Organic Solar Cells: Degradation Processes and Approaches to Enhance Performance

Fungura

2016

View full text Add to dashboard Cite

Delayed Fluorescence and Triplet-Triplet Annihilation inπ-Conjugated Polymers

Cited by 157 publications

References 21 publications

Traps and trions as origin of magnetoresistance in organic semiconductors

Traps and trions as origin of magnetoresistance in organic semiconductors

Electronic spectral and photophysical properties of some p-phenylenevinylene oligomers in solution and thin films

Organic Solar Cells: Degradation Processes and Approaches to Enhance Performance

Contact Info

Product

Resources

About