Exciplex Dipole Moments:  Cyanoanthracene Acceptors and Methyl-Substituted Benzene Donors

Mylon, Steven E.; Smirnov, Sergei; Braun, C.

doi:10.1021/jp981637w

Cited by 15 publications

(20 citation statements)

References 36 publications

(67 reference statements)

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“…The spectral shift of the exciplex emission can be explained by the large dipole moment of PPT. As the CT excited states have large dipole moments (Supplementary Table 2), reorganization of the PPT matrix in the excited-stateso-called solid-state solvation-induces the spectral shift during the TADF process [23][24][25] .…”

Section: Resultsmentioning

confidence: 99%

Influence of energy gap between charge-transfer and locally excited states on organic long persistence luminescence

et al. 2020

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Organic long-persistent luminescence (LPL) is an organic luminescence system that slowly releases stored exciton energy as light. Organic LPL materials have several advantages over inorganic LPL materials in terms of functionality, flexibility, transparency, and solutionprocessability. However, the molecular selection strategies for the organic LPL system still remain unclear. Here we report that the energy gap between the lowest localized triplet excited state and the lowest singlet charge-transfer excited state in the exciplex system significantly controls the LPL performance. Changes in the LPL duration and spectra properties are systematically investigated for three donor materials having a different energy gap. When the energy level of the lowest localized triplet excited state is much lower than that of the charge-transfer excited state, the system exhibits a short LPL duration and clear two distinct emission features originating from exciplex fluorescence and donor phosphorescence.

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Section: Resultsmentioning

confidence: 99%

Influence of energy gap between charge-transfer and locally excited states on organic long persistence luminescence

et al. 2020

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“…Third harmonic of Nd:YAG pulses shifted on either H 2 , CH 4 or CF 4 (to make 416 nm, 396 nm or 366 nm, respectively) were used for excitation. The pulses were 20 picosecond long and delivered by "Orion SB-R" Nd:YAG laser from MPB.…”

Section: Methodsmentioning

confidence: 99%

“…Hence Equation (1) becomes: (3) where the number of excited dipoles, N Ω , and the electrode area, S, are introduced. The average perpendicular projection of the dipole moment difference, <Δμ ⊥ >, is calculated from the averaged perpendicular projections of the excited, μ exc <cosθ> exc , and the depleted ground state, μ g <cosθ> g , dipole moments: (4) where θ is the angle between the direction of the dipole moment and the axis normal to the surface (see Figure 2). We wrote Equation (4) this way to emphasize that the angular distributions, f g (θ) and f exc (θ), of dipoles in the ground and excited states may differ.…”

Section: Theorymentioning

confidence: 99%

Surface-Assisted Transient Displacement Charge Technique. I. Photoinduced Charge Transfer in Self-Assembled Monolayers

Krasnoslobodtsev

Smirnov

2006

J. Phys. Chem. B

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Surface assisted photoinduced transient displacement charge (SPTDC) technique was developed in order to study light induced charge transfer in surface bound molecules and applied to investigation of self-assembled monolayers of 7-diethylaminocoumarin and 2,4-dinitrophenylamine. The dipole moment change measured by SPTDC correlates reasonably well with that measured in solution by standard PTDC technique and with semiempirical calculations. Shortening of the excited state lifetime of surface immobilized coumarin due to stimulated emission was observed in both fluorescence and dipole measurements. The dipole signal decline in low polarity solvents indicates the importance of dipole-dipole interaction that causes reorientation of molecules upon photoexcitation.

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“…We start by briefly reviewing the theoretical background for thePTDCtechnique.Thetheoryhasbeendescribedpreviously, [4][5][6][7]9,12 and here we reintroduce the key points that are important for understanding the technique and the data interpretation. The displacement current is measured as a voltage drop across a load resistor, R. In our case, it is the input resistance of the oscilloscope, R ) 50 Ω.…”

Section: Theorymentioning

confidence: 99%

“…The PTDC technique measures the dipole moments of transient states formed created by a light pulse. [4][5][6][7][8] Importantly, both initially formed states and subsequently formed states can be examined. Thus, PTDC allows for direct observation and quantification of photoinduced inter-and intramolecular charge transfer.…”

Section: Introductionmentioning

confidence: 99%

Electron Transfer in Platinum(II) Diimine-Centered Triads: Mechanistic Insights from Photoinduced Transient Displacement Current Measurements

2009

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The consequences of photoexcitation of a platinum diimine bisacetylide complex and its triads with phenothiazine species (McGarrah, J. E.; Eisenberg, R. Inorg. Chem. 2003, 42, 4355-4365) were investigated by the photoinduced transient displacement current (PTDC) method, with the aim of understanding the role of solvent in defining the nature and extent of intratriad electron transfer. PTDC enables reports on the distance of charge separation in photoexcited states. Photoexcition of the triad, Pt(dbbpy)(CCC(6)H(4)CH(2)(PTZ))(2) (where dbbpy = 4,4'-di-tert-butyl-2,2'-bipyridine), leads to formation of the (3)MLCT excited state, which in CH(2)Cl(2) is intramolecularly quenched by PTZ to form a charge-separated (CS) state, Pt(dbbpy(*-))(CCC(6)H(4)CH(2)(PTZ) CCC(6)H(4)CH(2)(PTZ(*+)); the CS state features a dipole moment oriented in essentially the opposite direction to that of the ground state. In toluene the last step of charge separation is shut down. In THF these two transient states are equilibrated, approximately as a 1:1 mixture of (3)MLCT and CS states, causing a complex, but instructive, PTDC response. The PTDC response for Pt(dbbpy)(CCC(6)H(5))(2), on the other hand, is similar in all solvents and shows a negative signal corresponding to a long-lived, and comparatively nonpolar, (3)MLCT state. The ground-state dipole moment, mu(g), weakly increases with solvent polarity, from approximately 11.5 D in toluene to approximately 15.5 D in THF and CH(2)Cl(2).

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Exciplex Dipole Moments: Cyanoanthracene Acceptors and Methyl-Substituted Benzene Donors

Cited by 15 publications

References 36 publications

Influence of energy gap between charge-transfer and locally excited states on organic long persistence luminescence

Influence of energy gap between charge-transfer and locally excited states on organic long persistence luminescence

Surface-Assisted Transient Displacement Charge Technique. I. Photoinduced Charge Transfer in Self-Assembled Monolayers

Electron Transfer in Platinum(II) Diimine-Centered Triads: Mechanistic Insights from Photoinduced Transient Displacement Current Measurements

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