Abstract

A pulsed photoacoustic system is used to determine the fluorescence quantum yield of diluted dye solutions in highly scattering media. In order to show its accuracy, the quantum yield of Rhodamine 6G in water and ethanol was calculated. The chemical Fuchsin was utilized as a dye reference because the entire excitation energy is converted into nonradiative relaxation processes. The scattering coefficient of the samples was incremented by using spherical silica particles of different sizes and concentrations. The determined mean values in the studied scattering optical density range (03cm1) were 0.95 for ethanol and 0.96 for water. These measurements are in excellent agreement with the best literature values.

© 2010 Optical Society of America

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Figures (5)

Fig. 1
Fig. 1

Experimental setup.

Fig. 2
Fig. 2

Characteristic PA signal of sample with 0.3 μM of the chemical Fuchsin diluted in H 2 O .

Fig. 3
Fig. 3

Photoacoustic amplitude versus concentration using H 2 O as the solvent: squares, Fuchsin and circles, Rhodamine 6G.

Fig. 4
Fig. 4

Photoacoustic amplitude versus concentration using Etoh as the solvent: triangles, Fuchsin and diamonds, Rhodamine 6G.

Fig. 5
Fig. 5

Calculated QY versus OD for different solvents and silica particles diameters: d si , circles, Etoh and d si = 0.5 μm ; squares, Etoh and d si = 1 μm ; triangles, H 2 O and d si = 0.5 μm ; lines, QY without silica particles for H 2 O (dashed line) and Etoh (dotted line).

Equations (5)

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p ( λ ) = ζ · β · v s 2 c p · δ · F 0 · [ 1 exp ( ε · C · δ ) ] = ζ · α ( λ ) .
α ( λ ) = β · v s 2 c p · F 0 · ε · C .
p ( λ ) = α ( λ ) · f · ( 1 λ λ F · ϕ F ) ,
p ( λ ) p α ( λ ) = 1 λ λ F · ϕ F .
ϕ F = λ F λ · ( 1 p p α ) .

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