Selective spectroscopy of terrylene in incommensurate matrix of biphenyl

Pärs, Martti; Palm, V.; Kuznetsov, An.; Kikas, J.

doi:10.1016/j.jlumin.2006.01.121

Cited by 3 publications

(4 citation statements)

References 5 publications

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“…At liquid helium temperature (LHeT), the PL spectrum of terrylene-doped biphenyl exhibits between ∼560 and 650 nm two groups of bands rising above rather strong background [3]. The part of this spectrum with the higher-frequency group consisting of four distinct peaks is depicted in figure 1.…”

Section: Resultsmentioning

confidence: 99%

“…One of such systems is crystalline biphenyl (C 12 H 10 ) doped with terrylene (C 30 H 16 ) molecules, a system that we have studied in recent years by spectroscopic methods including single-molecule spectroscopy [1][2][3]. Biphenyl is an interesting substance which has three different phases at ambient pressure (P) -a normal, commensurate phase C I with monoclinic structure, which is stable from the melting temperature (T ) of ∼70 • C down to 40 K, and two incommensurate phases: IC II between 40 and 17 K and IC III below 17 K. With increasing P, the phase transition temperatures T I −I I = 40 K and T I I −I I I = 17 K decrease rapidly and become zero at ∼1.8 kbar and ∼0.2 kbar, respectively (the detailed phase diagram of biphenyl can be found in our previous papers [4,5] The purpose of the present study was to establish how these phase transitions in biphenyl affect the photoluminescence (PL) of impurity terrylene molecules, which are known as popular probes in single-molecule spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

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Optical study of terrylene molecules in crystalline biphenyl: effects of pressure and temperature on the luminescence spectra

Laisaar

Kuznetsov

Palm

et al. 2006

High Pressure Research

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The photoluminescence spectra of terrylene guest molecules in polycrystalline biphenyl host were measured at various temperatures between 4.7 and 295 K under ambient pressure (1 atm) as well as under various pressures up to 4.4 kbar at 4.7 K and up to 4.9 kbar at 295 K. With increasing pressure, all four spectral peaks studied shift to the red. By elevating the temperature from 4.7 to 295 K at 1 atm, the most intense peak at 17,220 cm −1 first shifts slightly to the red, but at ∼40 K begins to shift to the blue. Comparison of the temperature and pressure shifts for this peak reveals that its temperature shift is mainly determined by the thermal expansion of the host crystal rather than by the change in the electron-phonon coupling with temperature.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optical study of terrylene molecules in crystalline biphenyl: effects of pressure and temperature on the luminescence spectra

Laisaar

Kuznetsov

Palm

et al. 2006

High Pressure Research

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“…144 In letzter Zeit erschienen diverse Beiträge über Untersuchungen zu molekularen Kristallen, z. B. über inkommensurable Phasen von Biphenyl145, 146 oder über Unordnung und molekulare Reorientierungen in Dimethylnaphthalin in einem breiten Temperaturbereich 147. Für einen Überblick über die jüngsten Fortschritte in der Physik und Chemie von Festkörpern bei tiefen Temperaturen unter Einschluss dynamischer Aspekte in Kristallen und weniger geordneten Systeme möchten wir auf ein Kapitel eines demnächst erscheinenden Buchs verweisen 148…”

Section: Schlussfolgerungen Und Ausblickunclassified

Einzelmoleküle als optische Nanosonden für weiche und komplexe Materie

2010

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Optische Signale von Einzelmolekülen liefern Informationen über die Struktur und Dynamik ihrer nanoskaligen Umgebung, frei von zeitlichen und räumlichen Mittelungen. Die so erhaltenen Daten sind von Nutzen, wenn komplexe Strukturen oder Dynamiken auftreten, wie bei Polymeren oder porösen Oxiden, aber auch bei anderen Materialien, deren Heterogenität zunächst weniger offensichtlich ist. Der Aufsatz gibt einen Überblick über die wichtigsten aktuellen Anwendungen von Einzelmolekülen in Untersuchungen an kondensierter Materie auf Nanometerebene, mit Betonung auf weicher Materie und Materialwissenschaften. Beispiele umfassen die Orientierungsverteilung von Molekülen in Kristallen, Rotationsdiffusion in glasbildenden molekularen Flüssigkeiten, Studien an Polymeren mit Sonden und markierten Ketten, poröse und heterogene Oxidmaterialien, das Blinken einzelner Moleküle und Nanokristalle sowie das Potenzial oberfächenverstärkter Raman‐Streuung für die Analyse lokaler chemischer Eigenschaften. Die Beispiele zeigen, dass statische und dynamische Heterogenität und die Breiten der Verteilungen molekularer Parameter wesentlich größer sind, als bisher angenommen.

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“…Their distribution and dynamics can be studied at low temperature by fine spectroscopy of the zero‐phonon lines of single probe molecules 143. 144 Several other studies of molecular crystals have appeared recently, for example, of the incommensurate phase of biphenyl,145, 146 or of the disorder and molecular reorientations in dimethylnaphthtalene in a broad temperature range 147. For a Review of the recent advances in the physics and chemistry of solids at low temperatures, including the dynamic aspects of crystals and more disordered systems, we refer to a book chapter in press 148…”

Section: Outlook and Conclusionmentioning

confidence: 99%

Single Molecules as Optical Nanoprobes for Soft and Complex Matter

2010

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The optical signals of single molecules provide information about structure and dynamics of their nanoscale environment, free from space and time averaging. These new data are particularly useful whenever complex structures or dynamics are present, as in polymers or in porous oxides, but also in many other classes of materials, where heterogeneity is less obvious. We review the main uses of single molecules in studies of condensed matter at nanometer scales, especially in the fields of soft matter and materials science. We discuss several examples, including the orientation distribution of molecules in crystals, rotational diffusion in glass-forming molecular liquids, polymer studies with probes and labeled chains, porous and heterogeneous oxide materials, blinking of single molecules and nanocrystals, and the potential of surface-enhanced Raman scattering for local chemical analysis. All these examples show that static and dynamic heterogeneities and the spread of molecular parameters are much larger than previously imagined.

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Selective spectroscopy of terrylene in incommensurate matrix of biphenyl

Cited by 3 publications

References 5 publications

Optical study of terrylene molecules in crystalline biphenyl: effects of pressure and temperature on the luminescence spectra

Optical study of terrylene molecules in crystalline biphenyl: effects of pressure and temperature on the luminescence spectra

Einzelmoleküle als optische Nanosonden für weiche und komplexe Materie

Single Molecules as Optical Nanoprobes for Soft and Complex Matter

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