2004
DOI: 10.1002/cphc.200400242
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Intramolecular Charge Transfer in Pyrromethene Laser Dyes: Photophysical Behaviour of PM650

Abstract: Absorption and fluorescence (steady-state and time-correlated) techniques are used to study the photophysical characteristics of the pyrromethene 650 (PM650) dye. The presence of the cyano group at the 8 position considerably shifts the absorption and fluorescence bands to lower energies with respect to other related pyrromethene dyes; this is attributed to the strong electron-acceptor character of the cyano group, as is theoretically confirmed by quantum mechanical methods. The fluorescence properties of PM65… Show more

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Cited by 95 publications
(52 citation statements)
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“…But this mixture was not pursued because the hazardous nature of DCM would decrease the ease of use and safety of the laser. The other dyes available in the desired spectral range with high efficiency, good photostability [29] are Pyrromethene dyes.…”
Section: Resultsmentioning
confidence: 99%
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“…But this mixture was not pursued because the hazardous nature of DCM would decrease the ease of use and safety of the laser. The other dyes available in the desired spectral range with high efficiency, good photostability [29] are Pyrromethene dyes.…”
Section: Resultsmentioning
confidence: 99%
“…Pyrromethene dyes have higher efficiency than the Rhodamine dyes because of their lower probability of losing energy to mechanisms that don't produce stimulated emission. These reduced mechanisms of loss include lower intersystem crossing rates [29], reduced triplet-triplet absorption cross sections [35], and lower aggregation formation, which all lead to a higher fluorescence quantum yield [36] (increased efficiency). PM 650 has efficiency that is atypical of Pyrromethene dyes because of an extra non-radiative deactivation process formed with an intramolecular charge transfer which is prominent in polar solvents such as ethanol [29].…”
Section: Concentrationmentioning
confidence: 99%
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“…In acidified acetonitrile, this produces the typical BODIPY-like narrow absorption and emission bands with a very high fluorescence yield. 5, [13][14][15][16][17][18][19][20][21][22][23] The absorption spectra of 1 in acetonitrile are shown as a function of pH in Figure 12a. The absorption spectra of 1 show a decrease of the absorbance band with a maximum at 597 nm with increasing HCl concentration (i.e., lower pH) and a simultaneous increase of the absorption at 553 nm.…”
Section: Ph Dependence Of the Absorption And Fluorescence Spectra In mentioning
confidence: 99%
“…12 BODIPY is a well-known fluorophore characterized by valuable properties such as high (photo)chemical stability and relatively high fluorescence quantum yields (often approaching 1.0) and absorption coefficients. 5, [13][14][15][16][17][18][19][20][21][22][23] Moreover, borondipyrromethene dyes are excitable with visible light, have narrow emission bandwidths with high peak intensities, and are amenable to structural modification.…”
Section: Introductionmentioning
confidence: 99%