Electron drift mobility in pyrazolo[3,4-b]quinoline doped polystyrene layers

Tameev, A. R.; He, Zhiqun; Milburn, G. H. W.; Kozlov, A. A.; Ванников, А. В.; Danel, A.; Tomasik, Piotr

doi:10.1063/1.126964

Cited by 24 publications

(10 citation statements)

References 14 publications

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“…The ®eld dependent mobility of PAP2 was then further investigated at different temperature as seen in Figure 3 and the mobility increases as the temperature is raised. It has been demonstrated that the correlated disorder model (CDM) [3] appeared to be a suitable model to describe the dependence of mobility on the applied electric ®eld from our previous study [1]. The CDM takes into account the dipole nature of the medium and leads to the following relationship describing non-dispersive mobility [3]:…”

Section: Resultsmentioning

confidence: 99%

“…Layered sandwich specimens (378 mm in thickness) were prepared for TOF experiment as previously described [1]. The drift mobility m was determined from the expression m d=F Á t T , where F is the applied ®eld and d is the thickness of carrier transporting layer.…”

Section: Methodsmentioning

confidence: 99%

“…In our work [1], a new class of organic electron transporting material pyrazolo [3,4-b]quinoline derivatives was reported. The pyrazoloquinoline The work was supported by the ISTC under Grant N2207 and the RFBR under Project 02-03-33052.…”

Section: Introductionmentioning

confidence: 99%

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A study of electron transport in bispyrazolopyridine derivatives

Tameev

Ванников

et al. 2002

Molecular Crystals and Liquid Crystals

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In bispyrazolopyridine derivatives dispersed into polystyrene, transient currents have been studied using a conventional time-of-¯ight method. A ®eld dependent electron drift mobility, in the range of 4610 À7 À2610 À5 cm 2 /(V s) at an electric ®eld of (0.677.0)610 5 V/cm, has been found. The correlation between chemical structure and measured mobility is found to ®t the correlated disorder model reasonably when the charge transport is represented in terms of the one-electron transfer between frontier molecular orbitals. Optimisation of molecule con®guration and calculation of the orbital energy and wave-function decay constant have been computed by the semi-empirical methods. The PM3 approach is shown to approximate experimental data more better than the AM1.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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A study of electron transport in bispyrazolopyridine derivatives

Tameev

Ванников

et al. 2002

Molecular Crystals and Liquid Crystals

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“…[39][40][41] Our recent work revealed a potential use of 1-phenyl-3,4-dimethyl-1H-pyrazolo [3,4-b]quinoline (PAQ5) as an emitter dopant to stabilize the colour characteristics. [36] Stable light emission is particularly important in display devices for generating a basic colour.…”

Section: Introductionmentioning

confidence: 99%

Exploring Reversible Quenching of Fluorescence from a Pyrazolo[3,4‐b]quinoline Derivative by Protonation

Kong

et al. 2010

ChemPhysChem

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Pyrazolo[3,4-b]quinoline derivatives are reported to be highly efficient organic fluorescent materials suitable for applications in light-emitting devices. Although their fluorescence remains stable in organic solvents or in aqueous solution even in the presence of H(2)O, halide salts (LiCl), alkali (NaOH) and weak acid (acetic acid), it suffers an efficient quenching process in the presence of protic acid (HCl) in aqueous or ethanolic solution. This quenching process is accompanied by a change in the UV spectrum, but it is reversible and can be fully recovered. Both steady-state and transient fluorescence spectra of 1-phenyl-3,4-dimethyl-1H-pyrazolo-[3,4-b]quinoline (PAQ5) during quenching are measured and analyzed. It is found that a combined dynamic and static quenching mechanism is responsible for the quenching processes. The ground-state proton-transfer complex [PAQ5H(+)] is responsible for static quenching. It changes linearly with proton concentration [H(+)] with a bimolecular association constant K(S)=1.95 M(-1) controlled by the equilibrium dissociation of HCl in ethanol. A dynamic quenching constant K(D)=22.4 M(-1) is obtained by fitting to the Stern-Volmer equation, with a bimolecular dynamic quenching rate constant k(d)=1.03x10(9) s(-1) M(-1) under ambient conditions. A change in electron distribution is simulated and explains the experiment results.

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“…PAQ4 and a few other pyrazoloquinoline and bispyrazolopyridine derivatives were found to have field-dependent electron mobilities in the range of 10 À6 -10 À4 (cm 2 V À1 s À1 ) when dispersed in a polystyrene matrix. [3,4] Coupled with their carrier transporting properties, pyrazoloquinoline and bispyrazolopyridine derivatives have been investigated to use in electroluminescent devices [2,5,6]. Copolymers with pyrazol moieties as main chains or side chains were also prepared [7].…”

Section: Introductionmentioning

confidence: 99%