Electric field effects on fluorescence of pyrene in a homogeneously distributed system and in an oriented molecular system

Ohta, Nobuhiro; Umeuchi, Shiro; Kanada, Takayuki; Akita, Kazunari; Kawabata, Hiroshi; Yamazaki, Iwao

doi:10.1016/s0022-2313(99)00379-8

Cited by 4 publications

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“…The characterization of the emitting state of the V-luminescence or B-fluorescence of pyrene, whose spectrum is very similar to the extracted emission spectrum shown in Figure 4a, is somewhat controversial, but these emissions have been ascribed to the excimer species having a partially overlapped conformation. The presence of the excimer, which has a partially overlapped conformation in pyrene and its derivatives, has been pointed out in other systems, and the fluorescence spectrum of this species has been reported to be located in the region of 400-420 nm in a vapor-deposited film, 27 at 400 nm in a single crystal, 28 at 420 nm in a pyrene-labeled polymer 2 and in a LB film, 29 at 415 nm in a PMMA matrix, 16 in neat liquid, 30 and in amorphous silica glass. 31 The present results show that there are at least three fluorescence components emitted from the distinct states of the partially overlapped excimer at 10 mol %: b LT (I), -(II), and -(III).…”

Section: At a High Concentration Of 10 Mol %mentioning

confidence: 91%

External Electric Field Effects on Fluorescence of Pyrene Butyric Acid in a Polymer Film: Concentration Dependence and Temperature Dependence

et al. 2006

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Fluorescence spectra and electrofluorescence spectra (plots of the electric field-induced change in fluorescence intensity as a function of wavelength) have been measured at different temperatures for pyrene butyric acid (PBA) in a PMMA film at different concentrations. At a low concentration of 0.5 mol % where fluorescence emitted from the locally excited state of PBA (LE fluorescence) is dominant, LE fluorescence spectra show only the Stark shift in the presence of an electric field (F), which results from the difference in molecular polarizability between the ground and emitting states. At a high concentration of 10 mol % where the so-called sandwich-type excimer fluorescence (EX(1)) is dominant, both EX(1) and LE fluorescence are quenched by F. Another fluorescence assigned to a partially overlapped excimer (EX(2)) also exists at room temperature, and this emission is enhanced by F. As the temperature decreases, three fluorescence emissions whose electric field effects are different from each other become clear besides EX(1) and LE fluorescence, indicating that at least five fluorescence components exist at high concentrations at low temperatures. At a medium concentration of 5 mol % where EX(1) is comparable in intensity to the LE fluorescence, the intensity of EX(1) is not affected by F at any temperature, but LE fluorescence and EX(2) are markedly influenced by F at room temperature, and four fluorescence emissions are confirmed at low temperatures.

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