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Proflavin hydrochloride delayed fluorescence

Fig. 15. Delayed emission spectra of 10 W proflavine hydrochloride in glycerol (left) and ethanol (right).s [Excitation at 2.73 n l (366 m/ )]. (1) Fluorescence emission spectrum at 20°C. (2) delayed emission spectrum (DES) at 20°C. (3) DES at —18° (4) DES at —38° (5) DES at —76°. Delayed emission spectra at a sensitivity approximately 80 times greater than that for the fluorescence emission spectrum. (6) Fluorescence emission spectrum at 20° (7) DES at 20° (8) DES at 0° (9) DES at —21° (10) DES at —39° (11) DES at —74°. Delayed emission spectra at a sensitivity approximately 10,000 times greater than that for the fluorescence emission spectrum. Fig. 15. Delayed emission spectra of 10 W proflavine hydrochloride in glycerol (left) and ethanol (right).s [Excitation at 2.73 n l (366 m/ )]. (1) Fluorescence emission spectrum at 20°C. (2) delayed emission spectrum (DES) at 20°C. (3) DES at —18° (4) DES at —38° (5) DES at —76°. Delayed emission spectra at a sensitivity approximately 80 times greater than that for the fluorescence emission spectrum. (6) Fluorescence emission spectrum at 20° (7) DES at 20° (8) DES at 0° (9) DES at —21° (10) DES at —39° (11) DES at —74°. Delayed emission spectra at a sensitivity approximately 10,000 times greater than that for the fluorescence emission spectrum.
The delayed fluorescence produced by triplet-triplet quenching is to be sharply differentiated from that observed with eosin or proflavine hydrochloride. The latter type has the same lifetime as the triplet and its intensity is proportional to the first power of the rate of light absorption. It is produced by thermal activation of molecules from the triplet level to the excited singlet level and can occur with any substance for which... [Pg.361]

Fig. 26. Sensitized anti-Stokes delayed fluorescence from anthracene.60 Normal fluorescence (curve 1) and delayed fluorescence (curve 2) from a solution containing 10- Af proflavine hydrochloride and 5 X 10-4M anthracene in ethanol excited by 436 m/ , 3 X 10-4 einstein liter-1 sec.-1 absorbed. Curve 1 at a sensitivity 3000 times less than curve 2. Temperature was — 66°C. 3°C. Fig. 26. Sensitized anti-Stokes delayed fluorescence from anthracene.60 Normal fluorescence (curve 1) and delayed fluorescence (curve 2) from a solution containing 10- Af proflavine hydrochloride and 5 X 10-4M anthracene in ethanol excited by 436 m/ , 3 X 10-4 einstein liter-1 sec.-1 absorbed. Curve 1 at a sensitivity 3000 times less than curve 2. Temperature was — 66°C. 3°C.
E-Type Delayed Fluorescence eosin, proflavine hydrochloride. [Pg.381]


See other pages where Proflavin hydrochloride delayed fluorescence is mentioned: [Pg.330]    [Pg.340]    [Pg.340]    [Pg.373]   
See also in sourсe #XX -- [ Pg.337 , Pg.341 ]




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