Measurements of the Fluorescence Decay Time in Mixed Solutions Using Pulse Fluorometery

1982 ◽  
Vol 37 (2) ◽  
pp. 197-198
Author(s):  
R. K. Bauer ◽  
R. Twardowski
Keyword(s):  
Malachite Green ◽  
Decay Time ◽  
Rhodamine 6G ◽  
Fluorescence Decay ◽  
Experimental Results ◽  
Mixed Solutions ◽  
Fluorescence Decay Time ◽  
The Mean

Abstract The mean fluorescence decay time for rhodamine 6G (donor) in the presence of malachite green (acceptor) has been investigated using a pulse fluorometer. The experimental results have been compared with theoretical ones obtained earlier [1].

Monomer and Excimer Fluorescence of 2-Phenylindole in p-Xylene at 20 °C Studied by Frequency-Domain Fluorometry

1993 ◽  
Vol 48 (12) ◽  
pp. 1173-1176
Author(s):  
A. Kawski ◽  
I. Gryczyński ◽  
B. P. Maliwal ◽  
G. Piszczek
Keyword(s):  
Frequency Domain ◽  
Decay Time ◽  
Modulation Frequency ◽  
Fluorescence Decay ◽  
Excimer Fluorescence ◽  
Fluorescence Decay Time ◽  
The Mean ◽  
Concentrated Solution ◽  
Monomer Fluorescence ◽  
Frequency Domain Fluorometry

Abstract The effect of 2-phenylindole (2PI) concentration in p-xylene upon the fluorescence decay time was investigated by frequency-domain fluorometry. The fluorescence decay of a dilute (10~ 5 M) 2PI solution in p-xylene at 20 °C is single exponential with the mean decay time t = 1.87 ns and practically independent of the observation wavelength (A obs) in the fluorescence band. The fluores-cence decay in a highly concentrated solution (6 x 10" 3 M) is heterogenic and depends on A obs . For a given modulation frequency (~ 200 Hz), the fluorescence phase shifts at the longwave observation (440-480 nm) distinctly exceed 90°, thus clearly indicating that the observed (excimer) fluorescence results from a process taking place in the excited state. The fluorescence decays were measured at seven values of A obs (360-480 nm), and all the results were analyzed comprehensively (tj and t 2 are equal for all A obs ; the amplitudes are different). The lifetimes of the excimer state is relatively short (~3.5 ns). Radiative (r e) and non-radiative (t,) rate constants for monomer fluorescence of 2PI in p-xylene were determined using appropriate data from photo-and radioluminescence measure-ments.

Mn4+ non-equivalent doped fluoride phosphor towards a short fluorescence decay time for backlighting

2022 ◽  
Author(s):  
Jie Li ◽  
Xinyi Yang ◽  
Tong Li ◽  
Yan-Qing Ye ◽  
Yayun Zhou ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Fluorescence Lifetime ◽  
Decay Time ◽  
Fluorescence Decay ◽  
Compensation Mechanism ◽  
Exchange Method ◽  
Fluorescence Decay Time ◽  
Ion Exchange Method

The non-equivalent doping of Mn4+ in the red-emitting fluoride phosphors effectively shortens the fluorescence lifetime. Herein, we successfully synthesized Rb2NaInF6:Mn4+ phosphors by an ion-exchange method. The compensation mechanism of Mn4+...

scholarly journals Fluorescence decay-time constants in organic liquid scintillators

2009 ◽  
Vol 80 (4) ◽  
pp. 043301 ◽  
Author(s):  
T. Marrodán Undagoitia ◽  
F. von Feilitzsch ◽  
L. Oberauer ◽  
W. Potzel ◽  
A. Ulrich ◽  
...  
Keyword(s):  
Decay Time ◽  
Organic Liquid ◽  
Fluorescence Decay ◽  
Time Constants ◽  
Fluorescence Decay Time
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