Laser dye stability. Part 3. Bicyclic dyes in ethanol

Photophysical Properties of Coumarin-30 Dye in Aprotic and Protic Solvents of Varying Polarities¶

“…Strong absorption cross section and high fluorescence quantum yield (È f ) of coumarin dyes make them excellent laser dyes for the blue-green region (1)(2)(3)(4)(5). These dyes have also been widely used as fluorescence probes in understanding the microenvironments of different heterogeneous media (6)(7)(8).…”

Photophysical parameters and fluorescence quenching of 7-diethylaminocoumarin (DEAC) laser dye

“…These dyes undergo substantial changes in their dipole moment on excitation, causing large Stokes shifts between their absorption and fluorescence spectra [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. These Stocks' shifts are again very sensitive to solvent polarities [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Because of these properties, the 7-aminocoumarin dyes have widely been used as probes in a variety of investigation, i.e., in the study of solvatochromic properties [9][10][11][12][13], determination of polarities in microenvironments [14,15], and measurements of solvent relaxation times [16][17][18][19][20][21].…”

“…Among these dyes, those having different amino groups at position 7 (commonly known as 7-aminocoumarins) are of special significance [1][2][3][4][5][6][7][8][9][10][11][12][13]. The fluorescence quantum yield (f f ) of these dyes is usually very high, often close to unity [1][2][3][4][5][6][7][8][9][10][11][12][13]. These dyes undergo substantial changes in their dipole moment on excitation, causing large Stokes shifts between their absorption and fluorescence spectra [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

“…Derivatives of 1,2-benzopyrone, commonly known as coumarin dyes, are the well-known laser dyes for the blue-green region [1][2][3][4][5][6][7][8]. Among these dyes, those having different amino groups at position 7 (commonly known as 7-aminocoumarins) are of special significance [1][2][3][4][5][6][7][8][9][10][11][12][13].…”

Fluorescent 2,7-Dialkylamino-[1,8]-Naphthyridines: Preparation and Spectroscopic Properties

“…Coumarins [2], azacoumarins [3] and chinolones [4] are well known fluorescent dyes with a molecular shape and size similar to naphthyridines but differing in their capabilities to form hydrogen bonds. The dialkylamino substituted 4-methyl-[1.8] naphthyridines described here are new and stable compounds that can be obtained easily through a synthesis consisting of only a few steps, and show an interesting fluorescence behaviour.…”